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    <header><strong>Javascript Documention</strong></header>
    <ul>
        <li id="wc"><a class="nav-link" href="#what_is_javascript?">What Is Javascript?</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="#where_to_find_javascript_information">Where To Find Javascript Information</a></li>
        <li><a class="nav-link" href="#javascript_and_java">Javascript And Java</a></li>
        <li><a class="nav-link" href="#javascript_and_the_ecmascript">Javascript And The ECMAScript</a></li>
        <li><a class="nav-link" href="#getting_started_with_javascript">Getting Started With Javascript</a></li>
        <li><a class="nav-link" href="#data_types">Data Types</a></li>
        <li id="dc"><a class="nav-link" href="#declaring_variables">Declaring Variables</a></li>
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<main id="main-doc">
    <section id="what_is_javascript?" class="main-section">
        <header>What Is Javascript?</header>
        <p>JavaScript is a cross-platform, object-oriented scripting language used to make webpages interactive (e.g. having complex animations, clickable buttons, popup menus, etc.).  There are also more advanced server side versions of JavaScript such as Node.Js which allow you to add more functionality to a website than simply downloading files (such as realtime collaboration between multiple computers). 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 <code>Array</code> <code>Date</code> and <code>Math</code> 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>
        <p>This means that in the browser, JavaScript can change the way the webpage (DOM) looks. And, likewise, Node.js JavaScript on the server can respond to custom requests from code written in the browser</p>
    </section>
    <section id="what_you_should_already_know" class="main-section">
        <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>
    </scetion>
    <section id="where_to_find_javascript_information" class="main-section">
        <header>Where To Find JavaScript Information</header>
        <article>
        <p>The JavaScript documentation on MDN includes the following:</p>
        <ul>
            <li>Learn Web Development provides information for beginners and introduces basic concepts of programming and the Internet.</li>
            <li>JavaScript Guide (this guide) provides an overview about the JavaScript language and its objects.</li>
            <li>JavaScript Reference provides detailed reference material for JavaScript.
                If you are new to JavaScript, start with the articles in the learning area and the JavaScript Guide. Once you have a firm grasp of the fundamentals, you can use the JavaScript Referenceto get more details on individual objects and statements.
            </li>
        </ul>
        </article>
    </section>
    <section id="javascript_and_java" class="main-section">
        <header>JavaScript and Java</header>
        <article>
            <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>
            <p>Java is a class-based programming language designed for fast execution and type safety. Type safety means, for instance, that you can't cast a Java integer into an object reference or access private memory by corrupting Java bytecodes. Java's class-based model means that programs consist exclusively of classes and their methods. Java's class inheritance and strong typing generally require tightly coupled object hierarchies. These requirements make Java programming more complex than JavaScript programming.</p>
            <p>In contrast, JavaScript descends in spirit from a line of smaller, dynamically typed languages such as HyperTalk and dBASE. These scripting languages offer programming tools to a much wider audience because of their easier syntax, specialized built-in functionality, and minimal requirements for object creation.</p>
        </article>
    </section>
    <section id="javascript_and_the_ecmascript" class="main-section">
        <header>JavaScript and the ECMAScript</header>
        <article>
            <p>JavaScript is standardized at Ecma International — the European association for standardizing information and communication systems (ECMA was formerly an acronym for the European Computer Manufacturers Association) to deliver a standardized, international programming language based on JavaScript. This standardized version of JavaScript, called ECMAScript, behaves the same way in all applications that support the standard. Companies can use the open standard language to develop their implementation of JavaScript. The ECMAScript standard is documented in the ECMA-262 specification. See New in JavaScript to learn more about different versions of JavaScript and ECMAScript specification editions.</p>
            <p>The ECMA-262 standard is also approved by the ISO (International Organization for Standardization) as ISO-16262. You can also find the specification on the Ecma International website. The ECMAScript specification does not describe the Document Object Model (DOM), which is standardized by the World Wide Web Consortium (W3C) and/or WHATWG (Web Hypertext Application Technology Working Group). The DOM defines the way in which HTML document objects are exposed to your script. To get a better idea about the different technologies that are used when programming with JavaScript, consult the article JavaScript technologies overview.</p>
        </article>
    </section>
    <section id="getting_started_with_javascript" class="main-section">
        <header>Getting started with JavaScript</header>
        <article>
            <p>Getting started with JavaScript is easy: all you need is a modern Web browser. This guide includes some JavaScript features which are only currently available in the latest versions of Firefox, so using the most recent version of Firefox is recommended.</p>
        </article>
    </section>
    <section id="data_types" class="main-section">
        <header>Data Types</header>
        <article>
            <p>The latest ECMAScript standard defines eight data types:</p>
            <ul>
                <li>Six data types that are primitives:
                    <ul>
                        <li>Boolean. <code>true</code> and <code>false.</code></li>
                        <li>null. A special keyword denoting a null value. Because JavaScript is case-sensitive, <code>null</code> is not the same as <code>Null</code>, <code>NULL</code>, or any other variant</li>
                        <li>Symbol (new in ECMAScript 2015). A data type whose instances are unique and immutable</li>
                        <li>String. A sequence of characters that represent a text value. For example: "Howdy"</li>
                        <li>BigInt. An integer with arbitrary precision. For example: <code>9007199254740992n.</code></li>
                        <li>Number. An integer or floating point number. For example: <code>42</code> or <code>3.14159</code>.</li>
                    </ul>
                </li>
                <li>and Object</li>
            </ul>
            <p>Although these data types are relatively few, they enable you to perform useful functions with your applications. <code>Objects</code> and <code>functions</code> 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>
        </article>
    </section>
    <section id="declaring_variables" class="main-section">
        <header>Declaring Variables</header>
        <article>
            <p>You can declare a variable in two ways:</p>
            <ul>
                <li>With the keyword <code>var</code> For example, <code>var x = 42.</code> This syntax can be used to declare both local and global variables, depending on the execution context.</li>
                <li>With the keyword <code>const</code> or <code>let</code> For example, <code>let y = 13.</code> This syntax can be used to declare a block-scope local variable. See Variable scope below.</li>
             </ul>
        </article>
    </section>
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