Technical Documentation Page - Build a Technical Documentation Page

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Hi ,I got two hints and my code below, I tried and checked it several times , But I don’t know where i need to adjust:
#####Hints:
Hint1: Each .main-section should have an id that matches the text of its first child, having any spaces in the child’s text replaced with underscores (_ ) for the id’s.
Hint2: 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”).
this is my code below:

<!DOCTYPE html>
<html lang="en">
 <head> 
   <meta charset="UTF-8"/>
   <meta name="viewport" content="width=device-width,initial-scale=1.0"/>
   <link rel="sheetstyle" href="styles.css"/>
 </head>
   <body>
     <nav id="navbar">
       <header>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="#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="#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>
        <ul>
          <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>
     </ul>
         
      </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>
        <ul>
          <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>
        </ul>
             
        </section>
    <section class="main-section" id="Hello_world">
      <header>Hello world</heder>
      
<code>unction greetMe(yourName) { alert("Hello " + yourName); }
greetMe("World");</code>
   
 </section>
      <section class="main-section" id="Variables">
        <header>Variables</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>
        <p>In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system based on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based object model instead of the more common class-based object model. The prototype-based model provides dynamic inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without any special declarative requirements. Functions can be properties of objects, executing as loosely typed methods.</p>
 <p>JavaScript is a very free-form language compared to Java. You do not have to declare all variables, classes, and methods. You do not have to be concerned with whether methods are public, private, or protected, and you do not have to implement interfaces. Variables, parameters, and function return types are not explicitly typed.</p>
           
      </section>

      <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>
        <code>var x = 42.</code>
        <p>This syntax can be used to declare both local and global variables.</p>
        <p>By simply assigning it a value. For example,</p>
        <code>x = 42.</code>
        <p>This always declares a global variable. It generates a strict JavaScript warning. You shouldn't use this variant.</p>
        <p>With the keyword let. For example,</p>
        <code>let y = 13.</code>
        <p>This syntax can be used to declare a block scope local variable. See Variable scope below.</p>
      
      </section>
      <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>
          <code>if (true) { var x = 5; } console.log(x); // 5</code>
          <p>This behavior changes, when using the let declaration introduced in ECMAScript 2015.</p>
          <code>if (true) { let y = 5; } console.log(y); // ReferenceError: y is
not defined</code>
          
      </section>
      <section class="main-section" id="Reference">
        <header>Reference</header>
      <ul>
        <li>All the documentation in this page is taken from <a href="https://technical-documentation-page.freecodecamp.rocks">MDN</a></li>
        </ul>
      </section>
    </main>         
     </body> 
</html>

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