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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

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About the <head>

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Insecure Resource

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

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HTML 

              
                <!-- Here's an example of a main navigation with framing added to the labels. -->

<!-- <li> doesn't have an end tag to remove the white space between list items. -->

<!-- SVG Icons -->
<svg style="position: absolute; width: 0; height: 0;" width="0" height="0" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<defs>
<symbol id="icon-home" viewBox="0 0 1024 1024">
	<title>home</title>
	<path class="path1" d="M1024 590.444l-512-397.426-512 397.428v-162.038l512-397.426 512 397.428zM896 576v384h-256v-256h-256v256h-256v-384l384-288z"></path>
</symbol>
<symbol id="icon-profile" viewBox="0 0 1024 1024">
	<title>profile</title>
	<path class="path1" d="M864 0h-768c-52.8 0-96 43.2-96 96v832c0 52.8 43.2 96 96 96h768c52.8 0 96-43.2 96-96v-832c0-52.8-43.2-96-96-96zM832 896h-704v-768h704v768zM256 576h448v64h-448zM256 704h448v64h-448zM320 288c0-53.019 42.981-96 96-96s96 42.981 96 96c0 53.019-42.981 96-96 96s-96-42.981-96-96zM480 384h-128c-52.8 0-96 28.8-96 64v64h320v-64c0-35.2-43.2-64-96-64z"></path>
</symbol>
<symbol id="icon-envelop" viewBox="0 0 1024 1024">
	<title>envelop</title>
	<path class="path1" d="M928 128h-832c-52.8 0-96 43.2-96 96v640c0 52.8 43.2 96 96 96h832c52.8 0 96-43.2 96-96v-640c0-52.8-43.2-96-96-96zM398.74 550.372l-270.74 210.892v-501.642l270.74 290.75zM176.38 256h671.24l-335.62 252-335.62-252zM409.288 561.698l102.712 110.302 102.71-110.302 210.554 270.302h-626.528l210.552-270.302zM625.26 550.372l270.74-290.75v501.642l-270.74-210.892z"></path>
</symbol>
</defs>
</svg>

<nav>
    <h2 class="heading">Main Navigation</h2>
    <ul>
        <li class="nav-item nav-item_home">
            <a href="#" title="Home">
                <span class="label">Home</span>
                <svg class="icon icon-home"><use xlink:href="#icon-home"></use></svg>
            </a>
        <li class="nav-item nav-item_about">
            <a href="#" title="About">
                <span class="label">About</span>
                <svg class="icon icon-profile"><use xlink:href="#icon-profile"></use></svg>
            </a>
        <li class="nav-item nav-item_contact">
            <a href="#" title="Contact">
                <span class="label">Contact</span>
                <svg class="icon icon-envelop"><use xlink:href="#icon-envelop"></use></svg>
            </a>
    </ul>
</nav>
!

CSS 

              
                /* The most important thing to do first in CSS is to pad the links - because increasing a link's active area pertains to usability */

/* Padding - with fixed dimensions */
.nav-item a
{
    display: block;
    width: 64px;
    height: 64px;
    overflow: hidden;
}

/* Now that we have Padding, it's time to layout the elements */
nav ul
{
    list-style: none;
    padding: 0;
}

nav .heading,
.label
{
    display: none; /* In practice, this should be hidden only visually and not from screenreaders and search engine crawlers */
}

.nav-item
{
    display: inline-block; /* To layout the navigation items side-by-side */
}

/* Visual Design */
.nav-item a
{
    color: white;
    background: red;
    text-decoration: none;
}

/* Interactive */
.nav-item a:hover
{
    background-color: blue;
}

/* Icon */
.icon
{
    width: 16px;
    height: 16px;
    fill: white;
}

/* Centering */
.nav-item a
{
    display: table-cell;
    text-align: center;
    vertical-align: middle;
}
!

JS
!
999px

Console