Technical Documentation Page - Build a Technical Documentation Page

hey guys , am having problems with this nav bar question , my nav bar has only one header element within in it but it still won’t let me pass. would really appreciate some help. thanks

Your code so far

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The challenge seed code and/or your solution exceeded the maximum length we can port over from the challenge.

You will need to take an additional step here so the code you wrote presents in an easy to read format.

Please copy/paste all the editor code showing in the challenge from where you just linked.

<!DOCTYPE html>
  <html lang="en">
    </html>
    <meta charset="UTF-8"><meta name="viewport" content="width=device-width>"
    <head>
   <link rel="stylesheet" href="style.css">
   </head>
   <body>
     <nav>
       <label class="logo">JS Documentation</label>
       <ul>
         <navbar>
           <header>Menu</header> 
         <li><a class="nav-link" href="#Introduction">Introduction</a></li>
          <li><a class="nav-link" href="#What_you_should_already_know">What you should already know</a></li>
           <li><a class="nav-link" href="#JavaScript_and_Java">JavaScript and Java</a></li>
            <li><a class="nav-link" href="#Hello_world">Hello world</a></li>
             <li><a class="nav-link" href="#Variables">Variables</a></li>
              
               <li><a class="nav-link" href="#Declaring_variables">Declaring variables</a></li>
             
           <li><a class="nav-link" href="#Variable_scope">Variable scope</a></li>
             
               <li><a class="nav-link" href="#Global_variables">Global variables</a></li>
            
               <li><a class="nav-link" href="#Constants">Constants</a></li>
             
              <li><a class="nav-link" href="#Data_types">Data types</a></li>
             
              <li><a class="nav-link" href="#if...else_statement">if...else statement</a></li>
             
              <li><a class="nav-link" href="#while_statement">while statement</a></li>
                       
              <li><a class="nav-link" href="#Function_declarations">Function declarations</a></li>
             
               <li><a class="nav-link" href="#Reference">Reference</a></li>
             </navbar>
             </ul> 
             </nav>

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.1 Safari/605.1.15

Challenge: Technical Documentation Page - Build a Technical Documentation Page

Link to the challenge:

Could you post your complete HTML code please? I can see a couple of issues with your code already but it would be better to see it all in the context of the rest of the page.

<!DOCTYPE html>
  <html lang="en">
    </html>
    <meta charset="UTF-8"><meta name="viewport" content="width=device-width>"
    <head>
   <link rel="stylesheet" href="style.css">
   </head>
   <body>
     <nav>
       <label class="logo">JS Documentation</label>
       <ul>
         <navbar>
           <header>Menu</header> 
         <li><a class="nav-link" href="#Introduction">Introduction</a></li>
          <li><a class="nav-link" href="#What_you_should_already_know">What you should already know</a></li>
           <li><a class="nav-link" href="#JavaScript_and_Java">JavaScript and Java</a></li>
            <li><a class="nav-link" href="#Hello_world">Hello world</a></li>
             <li><a class="nav-link" href="#Variables">Variables</a></li>
              
               <li><a class="nav-link" href="#Declaring_variables">Declaring variables</a></li>
             
           <li><a class="nav-link" href="#Variable_scope">Variable scope</a></li>
             
               <li><a class="nav-link" href="#Global_variables">Global variables</a></li>
            
               <li><a class="nav-link" href="#Constants">Constants</a></li>
             
              <li><a class="nav-link" href="#Data_types">Data types</a></li>
             
              <li><a class="nav-link" href="#if...else_statement">if...else statement</a></li>
             
              <li><a class="nav-link" href="#while_statement">while statement</a></li>
                       
              <li><a class="nav-link" href="#Function_declarations">Function declarations</a></li>
             
               <li><a class="nav-link" href="#Reference">Reference</a></li>
             </navbar>
             </ul> 
             </nav>
    <main id="main-doc">
    <section class="main-section" id="Introduction">
      <header>Introduction</header>
      <p>JavaScript is a cross-platform, object-oriented scripting language. It is a small and lightweight language. Inside a host environment (for example, a web browser), JavaScript can be connected to the objects of its environment to provide programmatic control over them.</p><p> JavaScript contains a standard library of objects, such as Array, Date, and Math, and a core set of language elements such as operators, control structures, and statements. Core JavaScript can be extended for a variety of purposes by supplementing it with additional objects; for example:</p>
      <ol>
        <li>Client-side JavaScript extends the core language by supplying objects to control a browser and its Document Object Model (DOM). For example, client-side extensions allow an application to place elements on an HTML form and respond to user events such as mouse clicks, form input, and page navigation</li>
        <li>Server-side JavaScript extends the core language by supplying objects relevant to running JavaScript on a server. For example, server-side extensions allow an application to communicate with a database, provide continuity of information from one invocation to another of the application, or perform file manipulations on a server.</li>
        </ol>
       </section>
     <section class="main-section" id="What_you_should_already_know">
       <header>What you should already know</header>
       <p>This guide assumes you have the following basic background:</p>
       <ol>
         <li>A general understanding of the Internet and the World Wide Web (WWW).</li>
         <li> Good working knowledge of HyperText Markup Language (HTML).</li>
         <li>Some programming experience. If you are new to programming, try one of the tutorials linked on the main page about JavaScript.</li>
         </ol>
         </section>

     
      <section class="main-section" id="JavaScript_and_Java"> 
        <header>JavaScript and Java
</header>
        <p>JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java expression syntax, naming conventions and basic control-flow constructs which was the reason why it was renamed from LiveScript to JavaScript</p>
        <nav id="navbar"><a class="nav-link"></a>
        <p> </p> <p></p><code></code><li></li> </section>
      
       <section class="main-section" id="Hello_world">
         <header>Hello world</header>
          <p>To get started with writing JavaScript, open the Scratchpad and write your first "Hello world" JavaScript code: </p>
         <nav id="navbar"><a class="nav-link"></a>
         <p></p><p>
</p><code></code>  <li></li></section>
        <section class="main-section" id="Variables">
         <header>Variables</header>
          <p> You use variables as symbolic names for values in your application. The names of variables, called identifiers, conform to certain rules.</p>
          <p>A JavaScript identifier must start with a letter, underscore (_), or dollar sign ($); subsequent characters can also be digits (0-9). Because JavaScript is case sensitive, letters include the characters "A" through "Z" (uppercase) and the characters "a" through "z" (lowercase).</p>
          <p> You can use ISO 8859-1 or Unicode letters such as å and ü in identifiers. You can also use the Unicode escape sequences as characters in identifiers. Some examples of legal names are Number_hits, temp99, and _name.</p>
         <nav id="navbar"><a class="nav-link"></a>
          <p></p> <p>
             <section class="main-section" id="Declaring_variables">
         <header>Declaring variables</header>
          <p>You can declare a variable in three ways:</p>
          <p>With the keyword var. For example,</p>
          <p>This syntax can be used to declare a block scope local variable. See Variable scope below.</p>

           <section class="main-section" id="Variable_scope">
         <header>Variable scope</header>
          <p>When you declare a variable outside of any function, it is called a global variable, because it is available to any other code in the current document. When you declare a variable within a function, it is called a local variable, because it is available only within that function. </p>
          <p>JavaScript before ECMAScript 2015 does not have block statement scope; rather, a variable declared within a block is local to the function (or global scope) that the block resides within. For example the following code will log 5, because the scope of x is the function (or global context) within which x is declared, not the block, which in this case is an if statement. </p>
<pre>
  <code>if (true) { var x = 5; } console.log(x); // 5 </code>
  </pre>
<p>This behavior changes, when using the let declaration introduced in ECMAScript 2015.</p>
<pre>
  <code>if (true) { let y = 5; } console.log(y); // ReferenceError: y is not defined</code>
  </pre>

           <section class="main-section" id="Global_variables">
         <header>Global variables</header>
          <p>Global variables are in fact properties of the global object. In web pages the global object is window, so you can set and access global variables using the window.variable syntax. </p>
          <p>Consequently, you can access global variables declared in one window or frame from another window or frame by specifying the window or frame name. For example, if a variable called phoneNumber is declared in a document, you can refer to this variable from an iframe as parent.phoneNumber.</p>

           <section class="main-section" id="Constants">
         <header>Constants</header>
          <p>You can create a read-only, named constant with the const keyword. The syntax of a constant identifier is the same as for a variable identifier: it must start with a letter, underscore or dollar sign and can contain alphabetic, numeric, or underscore characters.</p>
          <pre>
            <code>const PI = 3.14;</code>
            </pre>
          <p> A constant cannot change value through assignment or be re-declared while the script is running. It has to be initialized to a value.</p>
          <p> The scope rules for constants are the same as those for let block scope variables. If the const keyword is omitted, the identifier is assumed to represent a variable.</p>
          <p> You cannot declare a constant with the same name as a function or variable in the same scope. For example:</p>
          <pre>
            <code>// THIS WILL CAUSE AN ERROR function f() {}; const f = 5; // THIS WILL CAUSE AN ERROR ALSO function f() { const g = 5; var g; //statements }</code>
            </pre>
           <p> However, object attributes are not protected, so the following statement is executed without problems.</p>
             <pre>
               <code>const MY_OBJECT = {"key": "value"}; MY_OBJECT.key = "otherValue";</code>
               </pre>
             

           <section class="main-section" id="Data_type">
         <header>Data type</header>
          <p>The latest ECMAScript standard defines seven data types:</p>
          <ul>Six data types that are primitives:</ul>
              <li>Boolean. true and false</li>
              <li>null. A special keyword denoting a null value. Because JavaScript is case-sensitive, null is not the same as Null, NULL, or any other variant.</li>
               <li>undefined. A top-level property whose value is undefined.</li>
                <li>Number. 42 or 3.14159.</li>
                 <li> String. "Howdy"</li>
                 <ul>and Object</ul>
                 <p>Although these data types are a relatively small amount, they enable you to perform useful functions with your applications. Objects and functions are the other fundamental elements in the language. You can think of objects as named containers for values, and functions as procedures that your application can perform.</p> 

<section class="main-section" id="if...else_statement">
         <header>if...else statement</header>
          <p>Use the if statement to execute a statement if a logical condition is true. Use the optional else clause to execute a statement if the condition is false. An if statement looks as follows:</p>
          <pre>
            <code>if (condition) { statement_1; } else { statement_2; }</code>
            </pre>
          <p>condition can be any expression that evaluates to true or false. See Boolean for an explanation of what evaluates to true and false. If condition evaluates to true, statement_1 is executed; otherwise, statement_2 is executed. statement_1 and statement_2 can be any statement, including further nested if statements.</p>
<p>You may also compound the statements using else if to have multiple conditions tested in sequence, as follows:</p>
           <pre>
             <code>if (condition_1) { statement_1; } else if (condition_2) { statement_2; } else if (condition_n) { statement_n; } else { statement_last; }</code>
             </pre>
            <p>In the case of multiple conditions only the first logical condition which evaluates to true will be executed. To execute multiple statements, group them within a block statement ({ ... }) . In general, it's good practice to always use block statements, especially when nesting if statements:</p>
            
            <pre>
              <code>if (condition) { statement_1_runs_if_condition_is_true; statement_2_runs_if_condition_is_true; } else { statement_3_runs_if_condition_is_false; statement_4_runs_if_condition_is_false; }</code>
              </pre>
            <p>It is advisable to not use simple assignments in a conditional expression, because the assignment can be confused with equality when glancing over the code. For example, do not use the following code:</p> 
            <pre>
              <code>if (x = y) { /* statements here */ }</code>
              </pre>
            <p>If you need to use an assignment in a conditional expression, a common practice is to put additional parentheses around the assignment. For example:</p> 
            <pre>
              <code>if ((x = y)) { /* statements here */ }</code>
              </pre>
            
 <section class="main-section" id="while_statement">
         <header>while statement</header>
          <p>A while statement executes its statements as long as a specified condition evaluates to true. A while statement looks as follows:</p>
          <pre>
            <code>while (condition) statement</code>
            </pre>
          <p>If the condition becomes false, statement within the loop stops executing and control passes to the statement following the loop.</p>
          <p>The condition test occurs before statement in the loop is executed. If the condition returns true, statement is executed and the condition is tested again. If the condition returns false, execution stops and control is passed to the statement following while.</p>
          <p>To execute multiple statements, use a block statement ({ ... }) to group those statements.</p>
          <p>Example:</p>
          <p>The following while loop iterates as long as n is less than three:</p>
          <pre>
            <code>var n = 0; var x = 0; while (n < 3) { n++; x += n; }</code>
            </pre>
          <p>With each iteration, the loop increments n and adds that value to x. Therefore, x and n take on the following values:</p>
          <li>After the first pass: n = 1 and x = 1</li>
          <li>After the second pass: n = 2 and x = 3</li>
          <li>After the third pass: n = 3 and x = 6</li>
          <p>After completing the third pass, the condition n < 3 is no longer true, so the loop terminates.</p>

 <section class="main-section" id="Function_declaration">
         <header>Function declaration</header>
          <p>A function definition (also called a function declaration, or function statement) consists of the function keyword, followed by:</p>
          <li>The name of the function.</li>
          <li>A list of arguments to the function, enclosed in parentheses and separated by commas.</li>
          <li>The JavaScript statements that define the function, enclosed in curly brackets, { }.</li>
          <p>For example, the following code defines a simple function named square:</p>
         <pre>
           <code>function square(number) { return number * number; }</code>
           </pre>
          <p>The function square takes one argument, called number. The function consists of one statement that says to return the argument of the function (that is, number) multiplied by itself. The return statement specifies the value returned by the function.</p>
          <pre>
            <code>return number * number;</code>
            </pre>
          <p>Primitive parameters (such as a number) are passed to functions by value; the value is passed to the function, but if the function changes the value of the parameter, this change is not reflected globally or in the calling function.</p>



           <section class="main-section" id="Reference">
         <header>Reference</header>
         <a><li>All the documentation in this page is taken from <a href="https://developer.mozilla.org/en-US/docs/Web"/>MDN<li>
            
            
            
            

There are a few fundamental structural issues with your page, which you’ll need to fix first.

An HTML doc should be structured in the following way:

<!DOCTYPE html>
<html>
<head>
<!-- meta and link tags go here-->
</head>
<body>
<!--this is where all of your HTML content should go-->
</body>
</html>

Fix this first and then we can see what other issues may remain.

like this ?

<!DOCTYPE html>
  <html>
    <head>
    <meta charset="UTF-8"><meta name="viewport" content="width=device-width>"
   <link rel="stylesheet" href="style.css">
   </head>
   <body>
     <nav>
       <label class="logo">JS Documentation</label>
       <ul>
         <navbar>
           <header>Menu</header> 
         <li><a class="nav-link" href="#Introduction">Introduction</a></li>
          <li><a class="nav-link" href="#What_you_should_already_know">What you should already know</a></li>
           <li><a class="nav-link" href="#JavaScript_and_Java">JavaScript and Java</a></li>
            <li><a class="nav-link" href="#Hello_world">Hello world</a></li>
             <li><a class="nav-link" href="#Variables">Variables</a></li>
              
               <li><a class="nav-link" href="#Declaring_variables">Declaring variables</a></li>
             
           <li><a class="nav-link" href="#Variable_scope">Variable scope</a></li>
             
               <li><a class="nav-link" href="#Global_variables">Global variables</a></li>
            
               <li><a class="nav-link" href="#Constants">Constants</a></li>
             
              <li><a class="nav-link" href="#Data_types">Data types</a></li>
             
              <li><a class="nav-link" href="#if...else_statement">if...else statement</a></li>
             
              <li><a class="nav-link" href="#while_statement">while statement</a></li>
                       
              <li><a class="nav-link" href="#Function_declarations">Function declarations</a></li>
             
               <li><a class="nav-link" href="#Reference">Reference</a></li>
             </navbar>
             </ul> 
             </nav>
    <main id="main-doc">
    <section class="main-section" id="Introduction">
      <header>Introduction</header>
      <p>JavaScript is a cross-platform, object-oriented scripting language. It is a small and lightweight language. Inside a host environment (for example, a web browser), JavaScript can be connected to the objects of its environment to provide programmatic control over them.</p><p> JavaScript contains a standard library of objects, such as Array, Date, and Math, and a core set of language elements such as operators, control structures, and statements. Core JavaScript can be extended for a variety of purposes by supplementing it with additional objects; for example:</p>
      <ol>
        <li>Client-side JavaScript extends the core language by supplying objects to control a browser and its Document Object Model (DOM). For example, client-side extensions allow an application to place elements on an HTML form and respond to user events such as mouse clicks, form input, and page navigation</li>
        <li>Server-side JavaScript extends the core language by supplying objects relevant to running JavaScript on a server. For example, server-side extensions allow an application to communicate with a database, provide continuity of information from one invocation to another of the application, or perform file manipulations on a server.</li>
        </ol>
       </section>
     <section class="main-section" id="What_you_should_already_know">
       <header>What you should already know</header>
       <p>This guide assumes you have the following basic background:</p>
       <ol>
         <li>A general understanding of the Internet and the World Wide Web (WWW).</li>
         <li> Good working knowledge of HyperText Markup Language (HTML).</li>
         <li>Some programming experience. If you are new to programming, try one of the tutorials linked on the main page about JavaScript.</li>
         </ol>
         </section>

     
      <section class="main-section" id="JavaScript_and_Java"> 
        <header>JavaScript and Java
</header>
        <p>JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java expression syntax, naming conventions and basic control-flow constructs which was the reason why it was renamed from LiveScript to JavaScript</p>
        <nav id="navbar"><a class="nav-link"></a>
        <p> </p> <p></p><code></code><li></li> </section>
      
       <section class="main-section" id="Hello_world">
         <header>Hello world</header>
          <p>To get started with writing JavaScript, open the Scratchpad and write your first "Hello world" JavaScript code: </p>
         <nav id="navbar"><a class="nav-link"></a>
         <p></p><p>
</p><code></code>  <li></li></section>
        <section class="main-section" id="Variables">
         <header>Variables</header>
          <p> You use variables as symbolic names for values in your application. The names of variables, called identifiers, conform to certain rules.</p>
          <p>A JavaScript identifier must start with a letter, underscore (_), or dollar sign ($); subsequent characters can also be digits (0-9). Because JavaScript is case sensitive, letters include the characters "A" through "Z" (uppercase) and the characters "a" through "z" (lowercase).</p>
          <p> You can use ISO 8859-1 or Unicode letters such as å and ü in identifiers. You can also use the Unicode escape sequences as characters in identifiers. Some examples of legal names are Number_hits, temp99, and _name.</p>
         <nav id="navbar"><a class="nav-link"></a>
          <p></p> <p>
             <section class="main-section" id="Declaring_variables">
         <header>Declaring variables</header>
          <p>You can declare a variable in three ways:</p>
          <p>With the keyword var. For example,</p>
          <p>This syntax can be used to declare a block scope local variable. See Variable scope below.</p>

           <section class="main-section" id="Variable_scope">
         <header>Variable scope</header>
          <p>When you declare a variable outside of any function, it is called a global variable, because it is available to any other code in the current document. When you declare a variable within a function, it is called a local variable, because it is available only within that function. </p>
          <p>JavaScript before ECMAScript 2015 does not have block statement scope; rather, a variable declared within a block is local to the function (or global scope) that the block resides within. For example the following code will log 5, because the scope of x is the function (or global context) within which x is declared, not the block, which in this case is an if statement. </p>
<pre>
  <code>if (true) { var x = 5; } console.log(x); // 5 </code>
  </pre>
<p>This behavior changes, when using the let declaration introduced in ECMAScript 2015.</p>
<pre>
  <code>if (true) { let y = 5; } console.log(y); // ReferenceError: y is not defined</code>
  </pre>

           <section class="main-section" id="Global_variables">
         <header>Global variables</header>
          <p>Global variables are in fact properties of the global object. In web pages the global object is window, so you can set and access global variables using the window.variable syntax. </p>
          <p>Consequently, you can access global variables declared in one window or frame from another window or frame by specifying the window or frame name. For example, if a variable called phoneNumber is declared in a document, you can refer to this variable from an iframe as parent.phoneNumber.</p>

           <section class="main-section" id="Constants">
         <header>Constants</header>
          <p>You can create a read-only, named constant with the const keyword. The syntax of a constant identifier is the same as for a variable identifier: it must start with a letter, underscore or dollar sign and can contain alphabetic, numeric, or underscore characters.</p>
          <pre>
            <code>const PI = 3.14;</code>
            </pre>
          <p> A constant cannot change value through assignment or be re-declared while the script is running. It has to be initialized to a value.</p>
          <p> The scope rules for constants are the same as those for let block scope variables. If the const keyword is omitted, the identifier is assumed to represent a variable.</p>
          <p> You cannot declare a constant with the same name as a function or variable in the same scope. For example:</p>
          <pre>
            <code>// THIS WILL CAUSE AN ERROR function f() {}; const f = 5; // THIS WILL CAUSE AN ERROR ALSO function f() { const g = 5; var g; //statements }</code>
            </pre>
           <p> However, object attributes are not protected, so the following statement is executed without problems.</p>
             <pre>
               <code>const MY_OBJECT = {"key": "value"}; MY_OBJECT.key = "otherValue";</code>
               </pre>
             

           <section class="main-section" id="Data_type">
         <header>Data type</header>
          <p>The latest ECMAScript standard defines seven data types:</p>
          <ul>Six data types that are primitives:</ul>
              <li>Boolean. true and false</li>
              <li>null. A special keyword denoting a null value. Because JavaScript is case-sensitive, null is not the same as Null, NULL, or any other variant.</li>
               <li>undefined. A top-level property whose value is undefined.</li>
                <li>Number. 42 or 3.14159.</li>
                 <li> String. "Howdy"</li>
                 <ul>and Object</ul>
                 <p>Although these data types are a relatively small amount, they enable you to perform useful functions with your applications. Objects and functions are the other fundamental elements in the language. You can think of objects as named containers for values, and functions as procedures that your application can perform.</p> 

<section class="main-section" id="if...else_statement">
         <header>if...else statement</header>
          <p>Use the if statement to execute a statement if a logical condition is true. Use the optional else clause to execute a statement if the condition is false. An if statement looks as follows:</p>
          <pre>
            <code>if (condition) { statement_1; } else { statement_2; }</code>
            </pre>
          <p>condition can be any expression that evaluates to true or false. See Boolean for an explanation of what evaluates to true and false. If condition evaluates to true, statement_1 is executed; otherwise, statement_2 is executed. statement_1 and statement_2 can be any statement, including further nested if statements.</p>
<p>You may also compound the statements using else if to have multiple conditions tested in sequence, as follows:</p>
           <pre>
             <code>if (condition_1) { statement_1; } else if (condition_2) { statement_2; } else if (condition_n) { statement_n; } else { statement_last; }</code>
             </pre>
            <p>In the case of multiple conditions only the first logical condition which evaluates to true will be executed. To execute multiple statements, group them within a block statement ({ ... }) . In general, it's good practice to always use block statements, especially when nesting if statements:</p>
            
            <pre>
              <code>if (condition) { statement_1_runs_if_condition_is_true; statement_2_runs_if_condition_is_true; } else { statement_3_runs_if_condition_is_false; statement_4_runs_if_condition_is_false; }</code>
              </pre>
            <p>It is advisable to not use simple assignments in a conditional expression, because the assignment can be confused with equality when glancing over the code. For example, do not use the following code:</p> 
            <pre>
              <code>if (x = y) { /* statements here */ }</code>
              </pre>
            <p>If you need to use an assignment in a conditional expression, a common practice is to put additional parentheses around the assignment. For example:</p> 
            <pre>
              <code>if ((x = y)) { /* statements here */ }</code>
              </pre>
            
 <section class="main-section" id="while_statement">
         <header>while statement</header>
          <p>A while statement executes its statements as long as a specified condition evaluates to true. A while statement looks as follows:</p>
          <pre>
            <code>while (condition) statement</code>
            </pre>
          <p>If the condition becomes false, statement within the loop stops executing and control passes to the statement following the loop.</p>
          <p>The condition test occurs before statement in the loop is executed. If the condition returns true, statement is executed and the condition is tested again. If the condition returns false, execution stops and control is passed to the statement following while.</p>
          <p>To execute multiple statements, use a block statement ({ ... }) to group those statements.</p>
          <p>Example:</p>
          <p>The following while loop iterates as long as n is less than three:</p>
          <pre>
            <code>var n = 0; var x = 0; while (n < 3) { n++; x += n; }</code>
            </pre>
          <p>With each iteration, the loop increments n and adds that value to x. Therefore, x and n take on the following values:</p>
          <li>After the first pass: n = 1 and x = 1</li>
          <li>After the second pass: n = 2 and x = 3</li>
          <li>After the third pass: n = 3 and x = 6</li>
          <p>After completing the third pass, the condition n < 3 is no longer true, so the loop terminates.</p>

 <section class="main-section" id="Function_declaration">
         <header>Function declaration</header>
          <p>A function definition (also called a function declaration, or function statement) consists of the function keyword, followed by:</p>
          <li>The name of the function.</li>
          <li>A list of arguments to the function, enclosed in parentheses and separated by commas.</li>
          <li>The JavaScript statements that define the function, enclosed in curly brackets, { }.</li>
          <p>For example, the following code defines a simple function named square:</p>
         <pre>
           <code>function square(number) { return number * number; }</code>
           </pre>
          <p>The function square takes one argument, called number. The function consists of one statement that says to return the argument of the function (that is, number) multiplied by itself. The return statement specifies the value returned by the function.</p>
          <pre>
            <code>return number * number;</code>
            </pre>
          <p>Primitive parameters (such as a number) are passed to functions by value; the value is passed to the function, but if the function changes the value of the parameter, this change is not reflected globally or in the calling function.</p>



           <section class="main-section" id="Reference">
         <header>Reference</header>
         <a><li>All the documentation in this page is taken from <a href="https://developer.mozilla.org/en-US/docs/Web"/>MDN<li>
           </body>
           </html>
            
            
            
            

Yes, that’s better.

There are a few other issues to look at:

  1. You still have a syntax error in your meta element.

  2. The reason your navbar test is not passing is that you should only have one nav element in your document. You have a few <nav id="navbar"> tags for some reason.

  3. You also have a <navbar> element, which is not a valid HTML element.

The structure of your nav element isn’t quite as it should be either.
This is how the tags should be ordered:

<nav>
  <header>Header Name</header>
  <ul>
    <li>
    ...
    </li>
  </ul>
</nav>

You should have one nav element, inside which you have one header, a ul and as many li elements as you need. This is your navbar, which you can then position as required on the screen. The li elements will have links which allow you to click through to the corresponding sections of the page.

Once you’ve fixed all of these issues you should be passing most of the tests.

I don’t understand what you mean about the syntax error and every time I remove the (navbar) from my (a)element with the links it makes me fail the rest of the (navbar )questions and I don’t understand why.

<!DOCTYPE html>
  <html>
    <head>
    <meta charset="UTF-8"><meta name="viewport" content="width=device-width>"
   <link rel="stylesheet" href="style.css">
  </head>
   <body>
     <nav>
        <header class="logo">JS Documentation</header> 
       <ul>
         <li><a class="nav-link" href="#Introduction">Introduction</a></li>
          <li><a class="nav-link" href="#What_you_should_already_know">What you should already know</a></li>
           <li><a class="nav-link" href="#JavaScript_and_Java">JavaScript and Java</a></li>
            <li><a class="nav-link" href="#Hello_world">Hello world</a></li>
             <li><a class="nav-link" href="#Variables">Variables</a></li>
              
               <li><a class="nav-link" href="#Declaring_variables">Declaring variables</a></li>
             
           <li><a class="nav-link" href="#Variable_scope">Variable scope</a></li>
             
               <li><a class="nav-link" href="#Global_variables">Global variables</a></li>
            
               <li><a class="nav-link" href="#Constants">Constants</a></li>
             
              <li><a class="nav-link" href="#Data_types">Data types</a></li>
             
              <li><a class="nav-link" href="#if...else_statement">if...else statement</a></li>
             
              <li><a class="nav-link" href="#while_statement">while statement</a></li>
                       
              <li><a class="nav-link" href="#Function_declarations">Function declarations</a></li>
             
               <li><a class="nav-link" href="#Reference">Reference</a>
               </li>
             </ul> 
             </nav>
    <main id="main-doc">
    <section class="main-section" id="Introduction">
      <header>Introduction</header>
      <p>JavaScript is a cross-platform, object-oriented scripting language. It is a small and lightweight language. Inside a host environment (for example, a web browser), JavaScript can be connected to the objects of its environment to provide programmatic control over them.</p><p> JavaScript contains a standard library of objects, such as Array, Date, and Math, and a core set of language elements such as operators, control structures, and statements. Core JavaScript can be extended for a variety of purposes by supplementing it with additional objects; for example:</p>
      <ol>
        <li>Client-side JavaScript extends the core language by supplying objects to control a browser and its Document Object Model (DOM). For example, client-side extensions allow an application to place elements on an HTML form and respond to user events such as mouse clicks, form input, and page navigation</li>
        <li>Server-side JavaScript extends the core language by supplying objects relevant to running JavaScript on a server. For example, server-side extensions allow an application to communicate with a database, provide continuity of information from one invocation to another of the application, or perform file manipulations on a server.</li>
        </ol>
       </section>
     <section class="main-section" id="What_you_should_already_know">
       <header>What you should already know</header>
       <p>This guide assumes you have the following basic background:</p>
       <ol>
         <li>A general understanding of the Internet and the World Wide Web (WWW).</li>
         <li> Good working knowledge of HyperText Markup Language (HTML).</li>
         <li>Some programming experience. If you are new to programming, try one of the tutorials linked on the main page about JavaScript.</li>
         </ol>
         </section>

     
      <section class="main-section" id="JavaScript_and_Java"> 
        <header>JavaScript and Java
</header>
        <p>JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java expression syntax, naming conventions and basic control-flow constructs which was the reason why it was renamed from LiveScript to JavaScript</p>
        <nav id="navbar"><a class="nav-link"></a>
        <p> </p> <p></p><code></code><li></li> </section>
      
       <section class="main-section" id="Hello_world">
         <header>Hello world</header>
          <p>To get started with writing JavaScript, open the Scratchpad and write your first "Hello world" JavaScript code: </p>
         <nav id="navbar"><a class="nav-link"></a>
         <p></p><p>
</p><code></code>  <li></li></section>
        <section class="main-section" id="Variables">
         <header>Variables</header>
          <p> You use variables as symbolic names for values in your application. The names of variables, called identifiers, conform to certain rules.</p>
          <p>A JavaScript identifier must start with a letter, underscore (_), or dollar sign ($); subsequent characters can also be digits (0-9). Because JavaScript is case sensitive, letters include the characters "A" through "Z" (uppercase) and the characters "a" through "z" (lowercase).</p>
          <p> You can use ISO 8859-1 or Unicode letters such as å and ü in identifiers. You can also use the Unicode escape sequences as characters in identifiers. Some examples of legal names are Number_hits, temp99, and _name.</p>
         <nav id="navbar"><a class="nav-link"></a>
          <p></p> <p>
             <section class="main-section" id="Declaring_variables">
         <header>Declaring variables</header>
          <p>You can declare a variable in three ways:</p>
          <p>With the keyword var. For example,</p>
          <p>This syntax can be used to declare a block scope local variable. See Variable scope below.</p>

           <section class="main-section" id="Variable_scope">
         <header>Variable scope</header>
          <p>When you declare a variable outside of any function, it is called a global variable, because it is available to any other code in the current document. When you declare a variable within a function, it is called a local variable, because it is available only within that function. </p>
          <p>JavaScript before ECMAScript 2015 does not have block statement scope; rather, a variable declared within a block is local to the function (or global scope) that the block resides within. For example the following code will log 5, because the scope of x is the function (or global context) within which x is declared, not the block, which in this case is an if statement. </p>
<pre>
  <code>if (true) { var x = 5; } console.log(x); // 5 </code>
  </pre>
<p>This behavior changes, when using the let declaration introduced in ECMAScript 2015.</p>
<pre>
  <code>if (true) { let y = 5; } console.log(y); // ReferenceError: y is not defined</code>
  </pre>

           <section class="main-section" id="Global_variables">
         <header>Global variables</header>
          <p>Global variables are in fact properties of the global object. In web pages the global object is window, so you can set and access global variables using the window.variable syntax. </p>
          <p>Consequently, you can access global variables declared in one window or frame from another window or frame by specifying the window or frame name. For example, if a variable called phoneNumber is declared in a document, you can refer to this variable from an iframe as parent.phoneNumber.</p>

           <section class="main-section" id="Constants">
         <header>Constants</header>
          <p>You can create a read-only, named constant with the const keyword. The syntax of a constant identifier is the same as for a variable identifier: it must start with a letter, underscore or dollar sign and can contain alphabetic, numeric, or underscore characters.</p>
          <pre>
            <code>const PI = 3.14;</code>
            </pre>
          <p> A constant cannot change value through assignment or be re-declared while the script is running. It has to be initialized to a value.</p>
          <p> The scope rules for constants are the same as those for let block scope variables. If the const keyword is omitted, the identifier is assumed to represent a variable.</p>
          <p> You cannot declare a constant with the same name as a function or variable in the same scope. For example:</p>
          <pre>
            <code>// THIS WILL CAUSE AN ERROR function f() {}; const f = 5; // THIS WILL CAUSE AN ERROR ALSO function f() { const g = 5; var g; //statements }</code>
            </pre>
           <p> However, object attributes are not protected, so the following statement is executed without problems.</p>
             <pre>
               <code>const MY_OBJECT = {"key": "value"}; MY_OBJECT.key = "otherValue";</code>
               </pre>
             

           <section class="main-section" id="Data_type">
         <header>Data type</header>
          <p>The latest ECMAScript standard defines seven data types:</p>
          <ul>Six data types that are primitives:</ul>
              <li>Boolean. true and false</li>
              <li>null. A special keyword denoting a null value. Because JavaScript is case-sensitive, null is not the same as Null, NULL, or any other variant.</li>
               <li>undefined. A top-level property whose value is undefined.</li>
                <li>Number. 42 or 3.14159.</li>
                 <li> String. "Howdy"</li>
                 <ul>and Object</ul>
                 <p>Although these data types are a relatively small amount, they enable you to perform useful functions with your applications. Objects and functions are the other fundamental elements in the language. You can think of objects as named containers for values, and functions as procedures that your application can perform.</p> 

<section class="main-section" id="if...else_statement">
         <header>if...else statement</header>
          <p>Use the if statement to execute a statement if a logical condition is true. Use the optional else clause to execute a statement if the condition is false. An if statement looks as follows:</p>
          <pre>
            <code>if (condition) { statement_1; } else { statement_2; }</code>
            </pre>
          <p>condition can be any expression that evaluates to true or false. See Boolean for an explanation of what evaluates to true and false. If condition evaluates to true, statement_1 is executed; otherwise, statement_2 is executed. statement_1 and statement_2 can be any statement, including further nested if statements.</p>
<p>You may also compound the statements using else if to have multiple conditions tested in sequence, as follows:</p>
           <pre>
             <code>if (condition_1) { statement_1; } else if (condition_2) { statement_2; } else if (condition_n) { statement_n; } else { statement_last; }</code>
             </pre>
            <p>In the case of multiple conditions only the first logical condition which evaluates to true will be executed. To execute multiple statements, group them within a block statement ({ ... }) . In general, it's good practice to always use block statements, especially when nesting if statements:</p>
            
            <pre>
              <code>if (condition) { statement_1_runs_if_condition_is_true; statement_2_runs_if_condition_is_true; } else { statement_3_runs_if_condition_is_false; statement_4_runs_if_condition_is_false; }</code>
              </pre>
            <p>It is advisable to not use simple assignments in a conditional expression, because the assignment can be confused with equality when glancing over the code. For example, do not use the following code:</p> 
            <pre>
              <code>if (x = y) { /* statements here */ }</code>
              </pre>
            <p>If you need to use an assignment in a conditional expression, a common practice is to put additional parentheses around the assignment. For example:</p> 
            <pre>
              <code>if ((x = y)) { /* statements here */ }</code>
              </pre>
            
 <section class="main-section" id="while_statement">
         <header>while statement</header>
          <p>A while statement executes its statements as long as a specified condition evaluates to true. A while statement looks as follows:</p>
          <pre>
            <code>while (condition) statement</code>
            </pre>
          <p>If the condition becomes false, statement within the loop stops executing and control passes to the statement following the loop.</p>
          <p>The condition test occurs before statement in the loop is executed. If the condition returns true, statement is executed and the condition is tested again. If the condition returns false, execution stops and control is passed to the statement following while.</p>
          <p>To execute multiple statements, use a block statement ({ ... }) to group those statements.</p>
          <p>Example:</p>
          <p>The following while loop iterates as long as n is less than three:</p>
          <pre>
            <code>var n = 0; var x = 0; while (n < 3) { n++; x += n; }</code>
            </pre>
          <p>With each iteration, the loop increments n and adds that value to x. Therefore, x and n take on the following values:</p>
          <li>After the first pass: n = 1 and x = 1</li>
          <li>After the second pass: n = 2 and x = 3</li>
          <li>After the third pass: n = 3 and x = 6</li>
          <p>After completing the third pass, the condition n < 3 is no longer true, so the loop terminates.</p>

 <section class="main-section" id="Function_declaration">
         <header>Function declaration</header>
          <p>A function definition (also called a function declaration, or function statement) consists of the function keyword, followed by:</p>
          <li>The name of the function.</li>
          <li>A list of arguments to the function, enclosed in parentheses and separated by commas.</li>
          <li>The JavaScript statements that define the function, enclosed in curly brackets, { }.</li>
          <p>For example, the following code defines a simple function named square:</p>
         <pre>
           <code>function square(number) { return number * number; }</code>
           </pre>
          <p>The function square takes one argument, called number. The function consists of one statement that says to return the argument of the function (that is, number) multiplied by itself. The return statement specifies the value returned by the function.</p>
          <pre>
            <code>return number * number;</code>
            </pre>
          <p>Primitive parameters (such as a number) are passed to functions by value; the value is passed to the function, but if the function changes the value of the parameter, this change is not reflected globally or in the calling function.</p>



           <section class="main-section" id="Reference">
         <header>Reference</header>
         <a><li>All the documentation in this page is taken from <a href="https://developer.mozilla.org/en-US/docs/Web"/>MDN<li>
           </body>
           </html>
            
            
            

Look at the end of the line and you should see your syntax error:

You have a correctly structured nav element now, but you need to add the id attribute to your opening nav tag.
This should be the only <nav id="navbar"> tag in your code.
So, you should remove all of these extra tags and also all <a class='nav-link'> tags which appear anywhere else in your code.

If you make these changes, you will pass all but the following HTML tests:

  • Each .nav-link should have text that corresponds to the header text of its related section (e.g. if you have a “Hello world” section/header, your #navbar should have a .nav-link which has the text “Hello world”).

  • Each .nav-link should have an href attribute that links to its corresponding .main-section (e.g. If you click on a .nav-link element that contains the text “Hello world”, the page navigates to a section element with that id).

To pass those final two HTML tests, you will need to check your .nav-link href attributes, header text and .main-section id attributes, as there are a couple which aren’t completely consistent.

Okay ,so I tried to do what you asked and it worked (thanks a lot ) but now I got 5 questions to tackle. About the main section id’s , do all the id’s need to be different?
I went through the entire code and added opening and closing tags for the main and section elements though , I don’t think that’s right, and they all have the same id’s.

<!DOCTYPE html>
  <html>
    <head>
    <meta charset="UTF-8"><meta name="viewport" content="width=device-width">
   <link rel="stylesheet" href="style.css">
  </head>
   <body>
     <nav id="navbar">
        <header class="logo">JS Documentation</header> 
       <ul>
         <li><a href="#Introduction">Introduction</a></li>
          <li><a href="#What_you_should_already_know">What you should already know</a></li>
           <li><a  href="#JavaScript_and_Java">JavaScript and Java</a></li>
            <li><a  href="#Hello_world">Hello world</a></li>
             <li><a  href="#Variables">Variables</a></li>
              
               <li><a  href="#Declaring_variables">Declaring variables</a></li>
             
           <li><a href="#Variable_scope">Variable scope</a></li>
             
               <li><a href="#Global_variables">Global variables</a></li>
            
               <li><a  href="#Constants">Constants</a></li>
             
              <li><a  href="#Data_types">Data types</a></li>
             
              <li><a href="#if...else_statement">if...else statement</a></li>
             
              <li><a  href="#while_statement">while statement</a></li>
                       
              <li><a href="#Function_declarations">Function declarations</a></li>
             
               <li><a  href="#Reference">Reference</a>
               </li>
             </ul> 
             </nav>
    <main id="main-doc">
    <section class="main-section" id="Introduction">
      <header>Introduction</header>
      <p>JavaScript is a cross-platform, object-oriented scripting language. It is a small and lightweight language. Inside a host environment (for example, a web browser), JavaScript can be connected to the objects of its environment to provide programmatic control over them.</p><p> JavaScript contains a standard library of objects, such as Array, Date, and Math, and a core set of language elements such as operators, control structures, and statements. Core JavaScript can be extended for a variety of purposes by supplementing it with additional objects; for example:</p>
      <ol>
        <li>Client-side JavaScript extends the core language by supplying objects to control a browser and its Document Object Model (DOM). For example, client-side extensions allow an application to place elements on an HTML form and respond to user events such as mouse clicks, form input, and page navigation</li>
        <li>Server-side JavaScript extends the core language by supplying objects relevant to running JavaScript on a server. For example, server-side extensions allow an application to communicate with a database, provide continuity of information from one invocation to another of the application, or perform file manipulations on a server.</li>
        </ol>
       </section>
       </main>
         <main id="main-doc">
     <section class="main-section" id="What_you_should_already_know">
       <header>What you should already know</header>
       <p>This guide assumes you have the following basic background:</p>
       <ol>
         <li>A general understanding of the Internet and the World Wide Web (WWW).</li>
         <li> Good working knowledge of HyperText Markup Language (HTML).</li>
         <li>Some programming experience. If you are new to programming, try one of the tutorials linked on the main page about JavaScript.</li>
         </ol>
         </section>
         </main>
        <main id="main-doc">
      <section class="main-section" id="JavaScript_and_Java"> 
        <header>JavaScript and Java
</header>
        <p>JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java expression syntax, naming conventions and basic control-flow constructs which was the reason why it was renamed from LiveScript to JavaScript</p>
       <a class="nav-link"></a>
        <p> </p> <p></p><code></code><li></li> 
        </section>
        </main>
       <main id="main-doc">
       <section class="main-section" id="Hello_world">
         <header>Hello world</header>
          <p>To get started with writing JavaScript, open the Scratchpad and write your first "Hello world" JavaScript code: </p>
         <a class="nav-link"></a>
         <p></p><p>
</p><code></code>  <li></li>
        </section>
        </main>
        <main id="main-doc">
        <section class="main-section" id="Variables">
         <header>Variables</header>
          <p> You use variables as symbolic names for values in your application. The names of variables, called identifiers, conform to certain rules.</p>
          <p>A JavaScript identifier must start with a letter, underscore (_), or dollar sign ($); subsequent characters can also be digits (0-9). Because JavaScript is case sensitive, letters include the characters "A" through "Z" (uppercase) and the characters "a" through "z" (lowercase).</p>
          <p> You can use ISO 8859-1 or Unicode letters such as å and ü in identifiers. You can also use the Unicode escape sequences as characters in identifiers. Some examples of legal names are Number_hits, temp99, and _name.</p>
         <a class="nav-link"></a>
          <p></p> <p>
            </section>
              </main>
              <main id="main-doc">
             <section class="main-section" id="Declaring_variables">
         <header>Declaring variables</header>
          <p>You can declare a variable in three ways:</p>
          <p>With the keyword var. For example,</p>
          <p>This syntax can be used to declare a block scope local variable. See Variable scope below.</p>
          </section>
           </main>

              <main id="main-doc">
           <section class="main-section" id="Variable_scope">
         <header>Variable scope</header>
          <p>When you declare a variable outside of any function, it is called a global variable, because it is available to any other code in the current document. When you declare a variable within a function, it is called a local variable, because it is available only within that function. </p>
          <p>JavaScript before ECMAScript 2015 does not have block statement scope; rather, a variable declared within a block is local to the function (or global scope) that the block resides within. For example the following code will log 5, because the scope of x is the function (or global context) within which x is declared, not the block, which in this case is an if statement. </p>
<pre>
  <code>if (true) { var x = 5; } console.log(x); // 5 </code>
  </pre>
<p>This behavior changes, when using the let declaration introduced in ECMAScript 2015.</p>
<pre>
  <code>if (true) { let y = 5; } console.log(y); // ReferenceError: y is not defined</code>
  </pre>
            </section>
             </main>
              <main id="main-doc">
           <section class="main-section" id="Global_variables">
         <header>Global variables</header>
          <p>Global variables are in fact properties of the global object. In web pages the global object is window, so you can set and access global variables using the window.variable syntax. </p>
          <p>Consequently, you can access global variables declared in one window or frame from another window or frame by specifying the window or frame name. For example, if a variable called phoneNumber is declared in a document, you can refer to this variable from an iframe as parent.phoneNumber.</p>
            </section>
             </main>
              <main id="main-doc">
           <section class="main-section" id="Constants">
         <header>Constants</header>
          <p>You can create a read-only, named constant with the const keyword. The syntax of a constant identifier is the same as for a variable identifier: it must start with a letter, underscore or dollar sign and can contain alphabetic, numeric, or underscore characters.</p>
          <pre>
            <code>const PI = 3.14;</code>
            </pre>
          <p> A constant cannot change value through assignment or be re-declared while the script is running. It has to be initialized to a value.</p>
          <p> The scope rules for constants are the same as those for let block scope variables. If the const keyword is omitted, the identifier is assumed to represent a variable.</p>
          <p> You cannot declare a constant with the same name as a function or variable in the same scope. For example:</p>
          <pre>
            <code>// THIS WILL CAUSE AN ERROR function f() {}; const f = 5; // THIS WILL CAUSE AN ERROR ALSO function f() { const g = 5; var g; //statements }</code>
            </pre>
           <p> However, object attributes are not protected, so the following statement is executed without problems.</p>
             <pre>
               <code>const MY_OBJECT = {"key": "value"}; MY_OBJECT.key = "otherValue";</code>
               </pre>
               </section>
               </main>
                <main id="main-doc">
           <section class="main-section" id="Data_type">
         <header>Data type</header>
          <p>The latest ECMAScript standard defines seven data types:</p>
          <ul>Six data types that are primitives:</ul>
              <li>Boolean. true and false</li>
              <li>null. A special keyword denoting a null value. Because JavaScript is case-sensitive, null is not the same as Null, NULL, or any other variant.</li>
               <li>undefined. A top-level property whose value is undefined.</li>
                <li>Number. 42 or 3.14159.</li>
                 <li> String. "Howdy"</li>
                 <ul>and Object</ul>
                 <p>Although these data types are a relatively small amount, they enable you to perform useful functions with your applications. Objects and functions are the other fundamental elements in the language. You can think of objects as named containers for values, and functions as procedures that your application can perform.</p> 
                 </section>
                 </main>
                  <main id="main-doc">
<section class="main-section" id="if...else_statement">
         <header>if...else statement</header>
          <p>Use the if statement to execute a statement if a logical condition is true. Use the optional else clause to execute a statement if the condition is false. An if statement looks as follows:</p>
          <pre>
            <code>if (condition) { statement_1; } else { statement_2; }</code>
            </pre>
          <p>condition can be any expression that evaluates to true or false. See Boolean for an explanation of what evaluates to true and false. If condition evaluates to true, statement_1 is executed; otherwise, statement_2 is executed. statement_1 and statement_2 can be any statement, including further nested if statements.</p>
<p>You may also compound the statements using else if to have multiple conditions tested in sequence, as follows:</p>
           <pre>
             <code>if (condition_1) { statement_1; } else if (condition_2) { statement_2; } else if (condition_n) { statement_n; } else { statement_last; }</code>
             </pre>
            <p>In the case of multiple conditions only the first logical condition which evaluates to true will be executed. To execute multiple statements, group them within a block statement ({ ... }) . In general, it's good practice to always use block statements, especially when nesting if statements:</p>
            
            <pre>
              <code>if (condition) { statement_1_runs_if_condition_is_true; statement_2_runs_if_condition_is_true; } else { statement_3_runs_if_condition_is_false; statement_4_runs_if_condition_is_false; }</code>
              </pre>
            <p>It is advisable to not use simple assignments in a conditional expression, because the assignment can be confused with equality when glancing over the code. For example, do not use the following code:</p> 
            <pre>
              <code>if (x = y) { /* statements here */ }</code>
              </pre>
            <p>If you need to use an assignment in a conditional expression, a common practice is to put additional parentheses around the assignment. For example:</p> 
            <pre>
              <code>if ((x = y)) { /* statements here */ }</code>
              </pre>
                </section>
                 </main>
            <main id="main-doc">
 <section class="main-section" id="while_statement">
         <header>while statement</header>
          <p>A while statement executes its statements as long as a specified condition evaluates to true. A while statement looks as follows:</p>
          <pre>
            <code>while (condition) statement</code>
            </pre>
          <p>If the condition becomes false, statement within the loop stops executing and control passes to the statement following the loop.</p>
          <p>The condition test occurs before statement in the loop is executed. If the condition returns true, statement is executed and the condition is tested again. If the condition returns false, execution stops and control is passed to the statement following while.</p>
          <p>To execute multiple statements, use a block statement ({ ... }) to group those statements.</p>
          <p>Example:</p>
          <p>The following while loop iterates as long as n is less than three:</p>
          <pre>
            <code>var n = 0; var x = 0; while (n < 3) { n++; x += n; }</code>
            </pre>
          <p>With each iteration, the loop increments n and adds that value to x. Therefore, x and n take on the following values:</p>
          <li>After the first pass: n = 1 and x = 1</li>
          <li>After the second pass: n = 2 and x = 3</li>
          <li>After the third pass: n = 3 and x = 6</li>
          <p>After completing the third pass, the condition n < 3 is no longer true, so the loop terminates.</p>
          </section>
            </main>
            <main id="main-doc">
 <section class="main-section" id="Function_declaration">
         <header>Function declaration</header>
          <p>A function definition (also called a function declaration, or function statement) consists of the function keyword, followed by:</p>
          <li>The name of the function.</li>
          <li>A list of arguments to the function, enclosed in parentheses and separated by commas.</li>
          <li>The JavaScript statements that define the function, enclosed in curly brackets, { }.</li>
          <p>For example, the following code defines a simple function named square:</p>
         <pre>
           <code>function square(number) { return number * number; }</code>
           </pre>
          <p>The function square takes one argument, called number. The function consists of one statement that says to return the argument of the function (that is, number) multiplied by itself. The return statement specifies the value returned by the function.</p>
          <pre>
            <code>return number * number;</code>
            </pre>
          <p>Primitive parameters (such as a number) are passed to functions by value; the value is passed to the function, but if the function changes the value of the parameter, this change is not reflected globally or in the calling function.</p>
           </section>
            </main>


            <main id="main-doc">
           <section class="main-section" id="Reference">
         <header>Reference</header>
         <a><li>All the documentation in this page is taken from <a href="https://developer.mozilla.org/en-US/docs/Web"/>MDN</li>
         </section>
            </main>
           </body>
           </html>
            
            
            
            

Yes, all of your <section class='main-section'> elements need unique id attributes*.

What I was talking about was making sure that your id attributes were consistent with the href attributes of your .nav-link elements and also the text of the header elements for each section. There are a couple where there are minor inconsistencies.

It seems that, for some reason, you’ve lost most of your </section> tags. You also still have two <nav id="navbar"> tags elsewhere in your code, as well as a bunch of random p (and other) tags, which don’t appear to be doing anything.

You should only have one <main> element too, which should wrap around all of your <section> elements.

One final tip: If you can learn to format/indent your code correctly, it will be a LOT easier to see what’s going on.

* id attributes must always be unique. You cannot have two elements in the same document which share the same id atttribute.

Okay , I added the nav link for the nav bar and I’ve tried to make it look more formatted , I changed the id’s for the main-section and I got rid of the useless bits of code. Am down to the last 3 tests , 2 of them still about the nav bar and the last one is the media query. I have written the CSS code but for some reason it won’t apply in my preview.

<!DOCTYPE html>
  <html>
    <head>
    <meta charset="UTF-8"><meta name="viewport" content="width=device-width">
   <link rel="stylesheet" href="style.css">
  </head>
   <body>
     <nav id="navbar">
        <header class="logo">JS Documentation</header> 
       <ul>
          <li><a class="nav-link" href="#Introduction">Introduction</a></li>
          <li><a class="nav-link"href="#What_you_should_already_know">What you should already know</a></li>
          <li><a class="nav-link" href="#JavaScript_and_Java">JavaScript and Java</a></li>
          <li><a class="nav-link" href="#Hello_world">Hello world</a></li>
          <li><a class="nav-link" href="#Variables">Variables</a></li>
          <li><a class="nav-link" href="#Declaring_variables">Declaring variables</a></li>  
          <li><a  class="nav-link"href="#Variable_scope">Variable scope</a></li>
          <li><a class="nav-link"href="#Global_variables">Global variables</a></li>
          <li><a class="nav-link" href="#Constants">Constants</a></li>
          <li><a class="nav-link" href="#Data_types">Data types</a></li>
          <li><a  class="nav-link"href="#if...else_statement">if...else statement</a></li>
          <li><a  class="nav-link"href="#while_statement">while statement</a></li>
          <li><a  class="nav-link"href="#Function_declarations">Function declarations</a></li>
          <li><a class="nav-link"  href="#Reference">Reference</a></li>
       </ul> 
     </nav>
    <main id="main-doc">
    <section class="main-section" id="Introduction">
      <header>Introduction</header>
      <p>JavaScript is a cross-platform, object-oriented scripting language. It is a small and lightweight language. Inside a host environment (for example, a web browser), JavaScript can be connected to the objects of its environment to provide programmatic control over them.</p><p> JavaScript contains a standard library of objects, such as Array, Date, and Math, and a core set of language elements such as operators, control structures, and statements. Core JavaScript can be extended for a variety of purposes by supplementing it with additional objects; for example:</p>
      <ol>
        <li>Client-side JavaScript extends the core language by supplying objects to control a browser and its Document Object Model (DOM). For example, client-side extensions allow an application to place elements on an HTML form and respond to user events such as mouse clicks, form input, and page navigation</li>
        <li>Server-side JavaScript extends the core language by supplying objects relevant to running JavaScript on a server. For example, server-side extensions allow an application to communicate with a database, provide continuity of information from one invocation to another of the application, or perform file manipulations on a server.</li>
        </ol>
       </section>
       </main>
         <main id="2nd-doc">
     <section class="main-section" id="What_you_should_already_know">
       <header>What you should already know</header>
       <p>This guide assumes you have the following basic background:</p>
       <ol>
         <li>A general understanding of the Internet and the World Wide Web (WWW).</li>
         <li> Good working knowledge of HyperText Markup Language (HTML).</li>
         <li>Some programming experience. If you are new to programming, try one of the tutorials linked on the main page about JavaScript.</li>
         </ol>
         </section>
         </main>
        <main id="3rd-doc">
      <section class="main-section" id="JavaScript_and_Java"> 
        <header>JavaScript and Java
</header>
        <p>JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java expression syntax, naming conventions and basic control-flow constructs which was the reason why it was renamed from LiveScript to JavaScript</p>
        </section>
        </main>
       <main id="4th-doc">
       <section class="main-section" id="Hello_world">
         <header>Hello world</header>
          <p>To get started with writing JavaScript, open the Scratchpad and write your first "Hello world" JavaScript code: </p>
        
        </section>
        </main>
        <main id="5th-doc">
        <section class="main-section" id="Variables">
         <header>Variables</header>
          <p> You use variables as symbolic names for values in your application. The names of variables, called identifiers, conform to certain rules.</p>
          <p>A JavaScript identifier must start with a letter, underscore (_), or dollar sign ($); subsequent characters can also be digits (0-9). Because JavaScript is case sensitive, letters include the characters "A" through "Z" (uppercase) and the characters "a" through "z" (lowercase).</p>
          <p> You can use ISO 8859-1 or Unicode letters such as å and ü in identifiers. You can also use the Unicode escape sequences as characters in identifiers. Some examples of legal names are Number_hits, temp99, and _name.</p>
            </section>
              </main>
              <main id="6th-doc">
             <section class="main-section" id="Declaring_variables">
         <header>Declaring variables</header>
          <p>You can declare a variable in three ways:</p>
          <p>With the keyword var. For example,</p>
          <p>This syntax can be used to declare a block scope local variable. See Variable scope below.</p>
          </section>
           </main>

              <main id="7th-doc">
           <section class="main-section" id="Variable_scope">
         <header>Variable scope</header>
          <p>When you declare a variable outside of any function, it is called a global variable, because it is available to any other code in the current document. When you declare a variable within a function, it is called a local variable, because it is available only within that function. </p>
          <p>JavaScript before ECMAScript 2015 does not have block statement scope; rather, a variable declared within a block is local to the function (or global scope) that the block resides within. For example the following code will log 5, because the scope of x is the function (or global context) within which x is declared, not the block, which in this case is an if statement. </p>
<pre>
  <code>if (true) { var x = 5; } console.log(x); // 5 </code>
</pre>
<p>This behavior changes, when using the let declaration introduced in ECMAScript 2015.</p>
<pre>
  <code>if (true) { let y = 5; } console.log(y); // ReferenceError: y is not defined</code>
</pre>
           </section>
             </main>
              <main id="8th-doc">
           <section class="main-section" id="Global_variables">
         <header>Global variables</header>
          <p>Global variables are in fact properties of the global object. In web pages the global object is window, so you can set and access global variables using the window.variable syntax. </p>
          <p>Consequently, you can access global variables declared in one window or frame from another window or frame by specifying the window or frame name. For example, if a variable called phoneNumber is declared in a document, you can refer to this variable from an iframe as parent.phoneNumber.</p>
            </section>
             </main>
              <main id="9th-doc">
           <section class="main-section" id="Constants">
         <header>Constants</header>
          <p>You can create a read-only, named constant with the const keyword. The syntax of a constant identifier is the same as for a variable identifier: it must start with a letter, underscore or dollar sign and can contain alphabetic, numeric, or underscore characters.</p>
          <pre>
            <code>const PI = 3.14;</code>
            </pre>
          <p> A constant cannot change value through assignment or be re-declared while the script is running. It has to be initialized to a value.</p>
          <p> The scope rules for constants are the same as those for let block scope variables. If the const keyword is omitted, the identifier is assumed to represent a variable.</p>
          <p> You cannot declare a constant with the same name as a function or variable in the same scope. For example:</p>
          <pre>
            <code>// THIS WILL CAUSE AN ERROR function f() {}; const f = 5; // THIS WILL CAUSE AN ERROR ALSO function f() { const g = 5; var g; //statements }</code>
            </pre>
           <p> However, object attributes are not protected, so the following statement is executed without problems.</p>
             <pre>
               <code>const MY_OBJECT = {"key": "value"}; MY_OBJECT.key = "otherValue";</code>
               </pre>
               </section>
               </main>
                <main id="main-doc">
           <section class="main-section" id="Data_type">
         <header>Data type</header>
          <p>The latest ECMAScript standard defines seven data types:</p>
          <ul>Six data types that are primitives:</ul>
              <li>Boolean. true and false</li>
              <li>null. A special keyword denoting a null value. Because JavaScript is case-sensitive, null is not the same as Null, NULL, or any other variant.</li>
               <li>undefined. A top-level property whose value is undefined.</li>
                <li>Number. 42 or 3.14159.</li>
                 <li> String. "Howdy"</li>
                 <ul>and Object</ul>
                 <p>Although these data types are a relatively small amount, they enable you to perform useful functions with your applications. Objects and functions are the other fundamental elements in the language. You can think of objects as named containers for values, and functions as procedures that your application can perform.</p> 
                 </section>
                 </main>
                  <main id="main-doc">
<section class="main-section" id="if...else_statement">
         <header>if...else statement</header>
          <p>Use the if statement to execute a statement if a logical condition is true. Use the optional else clause to execute a statement if the condition is false. An if statement looks as follows:</p>
          <pre>
            <code>if (condition) { statement_1; } else { statement_2; }</code>
            </pre>
          <p>condition can be any expression that evaluates to true or false. See Boolean for an explanation of what evaluates to true and false. If condition evaluates to true, statement_1 is executed; otherwise, statement_2 is executed. statement_1 and statement_2 can be any statement, including further nested if statements.</p>
<p>You may also compound the statements using else if to have multiple conditions tested in sequence, as follows:</p>
           <pre>
             <code>if (condition_1) { statement_1; } else if (condition_2) { statement_2; } else if (condition_n) { statement_n; } else { statement_last; }</code>
             </pre>
            <p>In the case of multiple conditions only the first logical condition which evaluates to true will be executed. To execute multiple statements, group them within a block statement ({ ... }) . In general, it's good practice to always use block statements, especially when nesting if statements:</p>
            
            <pre>
              <code>if (condition) { statement_1_runs_if_condition_is_true; statement_2_runs_if_condition_is_true; } else { statement_3_runs_if_condition_is_false; statement_4_runs_if_condition_is_false; }</code>
              </pre>
            <p>It is advisable to not use simple assignments in a conditional expression, because the assignment can be confused with equality when glancing over the code. For example, do not use the following code:</p> 
            <pre>
              <code>if (x = y) { /* statements here */ }</code>
              </pre>
            <p>If you need to use an assignment in a conditional expression, a common practice is to put additional parentheses around the assignment. For example:</p> 
            <pre>
              <code>if ((x = y)) { /* statements here */ }</code>
              </pre>
                </section>
                 </main>
            <main id="main-doc">
 <section class="main-section" id="while_statement">
         <header>while statement</header>
          <p>A while statement executes its statements as long as a specified condition evaluates to true. A while statement looks as follows:</p>
          <pre>
            <code>while (condition) statement</code>
            </pre>
          <p>If the condition becomes false, statement within the loop stops executing and control passes to the statement following the loop.</p>
          <p>The condition test occurs before statement in the loop is executed. If the condition returns true, statement is executed and the condition is tested again. If the condition returns false, execution stops and control is passed to the statement following while.</p>
          <p>To execute multiple statements, use a block statement ({ ... }) to group those statements.</p>
          <p>Example:</p>
          <p>The following while loop iterates as long as n is less than three:</p>
          <pre>
            <code>var n = 0; var x = 0; while (n < 3) { n++; x += n; }</code>
            </pre>
          <p>With each iteration, the loop increments n and adds that value to x. Therefore, x and n take on the following values:</p>
          <li>After the first pass: n = 1 and x = 1</li>
          <li>After the second pass: n = 2 and x = 3</li>
          <li>After the third pass: n = 3 and x = 6</li>
          <p>After completing the third pass, the condition n < 3 is no longer true, so the loop terminates.</p>
          </section>
            </main>
            <main id="main-doc">
 <section class="main-section" id="Function_declaration">
         <header>Function declaration</header>
          <p>A function definition (also called a function declaration, or function statement) consists of the function keyword, followed by:</p>
          <li>The name of the function.</li>
          <li>A list of arguments to the function, enclosed in parentheses and separated by commas.</li>
          <li>The JavaScript statements that define the function, enclosed in curly brackets, { }.</li>
          <p>For example, the following code defines a simple function named square:</p>
         <pre>
           <code>function square(number) { return number * number; }</code>
           </pre>
          <p>The function square takes one argument, called number. The function consists of one statement that says to return the argument of the function (that is, number) multiplied by itself. The return statement specifies the value returned by the function.</p>
          <pre>
            <code>return number * number;</code>
            </pre>
          <p>Primitive parameters (such as a number) are passed to functions by value; the value is passed to the function, but if the function changes the value of the parameter, this change is not reflected globally or in the calling function.</p>
           </section>
            </main>
            <main id="main-doc">
           <section class="main-section" id="Reference">
         <header>Reference</header>
         <a><li>All the documentation in this page is taken from <a href="https://developer.mozilla.org/en-US/docs/Web"/>MDN</li>
         </section>
            </main>
           </body>
           </html>
            
            
            

Ah, you don’t have the correct href attribute here, so it can’t find your CSS file.
Check the filename.

You still have several main elements in your document. Even though you’ve given them all unique ids now, you should only have one main element, which encloses all of the main content on the page (i.e. all of your section elements should be contained within a single main element). It’s not causing any tests to fail, but it’s just a question of good practice.

The reason you’re not passing the other two tests is that you haven’t corrected the naming inconsistencies which I mentioned previously.

For instance, you have an href="#Data_types" attribute on one .nav-link element but when you look at the corresponding section element, the id attribute does not match. Neither does the text for that header element either.

There is one other similar case too.

Fix these inconsistencies and the tests will pass.

Thank you so much for all your help I’ve learnt so much and I feel so much better coding right now :smiley: :heart:

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