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    <main id="main-doc">
      <section class="main-section" id="Introduction">
        <header id="Introduction"><h1>Introduction</h1></header>
        <code>Declaring variables</code>
        <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>
        <li>Client-side</li>
     <li>Server-side</li>
       <code>Declaring variables</code>
      </section> 


      <section class="main-section" id="What_you_should_already_know">
        <header id="What_you_should_already_know"><h2>What you should already know</h2></header>
        <p>This guide assumes you have the following basic background:</p>
        <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>
     <p>Any other content to be covered before learning this topic</p>
      </section>


      <section class="main-section" id="JavaScript_and_Java">
        <header id="JavaScript_and_Java"><h3>JavaScript and Java</h3></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>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 id="Hello_world"><h4>Hello world</h4></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); }</code>
<code>greetMe("World");</code>
<p>Select the code in the pad and hit Ctrl+R to watch it unfold in your browser!</p>
<code>Hello world</code>
      </section>

      <section class="main-section" id="Variables">
        <header id="Variables"><h5>Variables</h5></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>
     <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="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>
  </ul>
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Each of these links should start with a # symbol in order to work inside the page.

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