Technical Documentation Page - Build a Technical Documentation Page

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I am failing the test that says " You should have the same number of .nav-link and .main-section elements." I don’t understand what I did wrong, and I’d be grateful for any explanation.
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<!DOCTYPE html>
<html>
  <head>
  <meta charset="utf-8">
  <meta name="viewport" content="width= device-wiidth initial scale=1.0">
  <title>JS Documentation</title>
  <link rel="stylesheet" href="styles.css"><//link>
  </head>
  <nav id="navbar">
      <ul id="the_navbar">
      <header><li><a class="nav-link" href="#Introduction" id="active">Introduction</a></li></header>
      <li><a class="nav-link" href="#Prerequisites">Prerequisites</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="#Data_types">Data types</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 class="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="Prerequisites">
      <header class="header">Prerequisites</header>
      <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="Javascript_and_java">
      <header class="header">Javascript and java</header>
      <p>JavaScript and Java are similar in some ways but 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>Unlike Java, 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="Hello_world">
      <header class="header">Hello world</header>
      <p>To get started with writing JavaScript, open the Scratchpad and write your first "Hello world" JavaScript code:</p>
      <code>function greetMe(yourName) { alert("Hello " + yourName); }
greetMe("World");</code>

      <p>Select the code in the pad and hit Ctrl+R to watch it unfold in your browser!</p>
    </section>
    <section class="main-section" id="Variables">
      <header class="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>
      </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:</p>
      <code>var x=42;</code>
      <p>Don't just assign it a value!</p>
      <code>x=42.</code>
      <p> Using the keyword let:</p>
      <code>let y=13;</code>
      <p>Use variable scope like this:</p>
      <code>if (true) { let y = 5; } console.log(y); // ReferenceError: y is
not defined</code>
    </section>
    <section class="main-section" id="Data_types">
      <header class="header">Data types</header>
      <p>The latest ECMAScript standard defines seven data types, of which six are primitives:</p>
      <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>
       <li>Symbol. A data type whose instances are unique and immutable.</li>
              <li>and Object</li>
      </ul>
      <p>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>
    <section class="main_section" id="Reference">
      <header>Reference</header>
      <p>All of this page's documentation is from <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide">MDN</a></p>;
    </section>
  </main>
</html>

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Challenge: Technical Documentation Page - Build a Technical Documentation Page

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Hey there, I found the error, your last main-section should have a dash “-” and instead you have an underscore “_”.

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