Technical Documentation Page - Build a Technical Documentation Page

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<!DOCTYPE html>
<html>
  <head>
  <meta charset="utf-8">
  <meta name="viewport" 
  <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="#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="#data_types">Data Types</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="what_you_should_already_know">
      <header class="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="javascript_and_java">
      <header class="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>
      <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="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>
      <p class="code">function greetMe(yourName) { alert("Hello " + yourName); }
greetMe("World");</p>
      <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>
      <h2>Declaring Variables</h2>
      <p>You can declare a variable in three ways:</p>
      <p> With the keyword var:</p>
      <p class="code">var x=42;</p>
      <p>Don't just assign it a value!</p>
      <p> Using the keyword let:</p>
      <p class="code">let y=13;</p>
    </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 (new in ECMAScript 2015). A data type whose instances are unique and immutable.</li>
              <li>and Object</li>
      </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>
</html>
.header{
  color: black;
  font-family: Trebuchet MS;
  size: 20px;
}
p, ul{
  font-family: sans-serif;
}
#the_navbar{
  list-style-type: none;
  margin:0;
  padding: 0;
  height: 100%;
  position: fixed;
  overflow: auto;
  width: 28%;
}
li a {
  display: block;
  width: 120px;
  color: rgb(24, 22, 22);
}
li a:hover{
  color: rgb(28, 80, 136);
}
#navbar{
border: 1px solid #555;
}
#active{
  background-color: rgb(112, 204, 112);
}
main{
  padding-left: 200px;
  padding-right: 20px;
  overflow: hidden;
position: absolute;
}
li:last-child {
  border-bottom: none;
}
@media (max-width: 1250px){
  text-align: center;
}
.code{
  padding: 50px;
  background-color: rgb(187, 187, 180);
  font-family: Courier;
}
h2{
  font-family: Trebuchet MS;
  size: 10px;
}

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Challenge: Technical Documentation Page - Build a Technical Documentation Page

Link to the challenge:

The problem is that the hover function won’t work, even though it did before. I also don’t know if the links on the navbar are working.

The instructions said to match the header to the main-section id exactly. This means that even capital letters must match. Try to fix all the ids and also all the navbar references after that to match exactly the ids they are linking to.

I double checked, the ids match. Is there something I might have missed?

I showed you one of the lines where the id and the header do not match in my last response.
You wrote id=“introduction” but it should be “Introduction”
Same for all the others ones…