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HTML

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Adding Classes

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About the <head>

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Insecure Resource

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CSS

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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

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Vendor Prefixing

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JavaScript

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

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Babel includes JSX processing.

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HTML 

              
                body
	header.header
		// Fake logo markup, see article for real markup
		a.logo(href="#" title="Go to home page") Logo

		nav.primary-nav(aria-label="Primary")
			ul
				- var i = 0;
				while i < 3
					-i++;
					li: a(href='#') Primary nav

		form.search(role="search" aria-label="site")
			label
				span Search
				input(type="search")
			button(type="submit") Submit

	nav.secondary-nav(aria-label="Secondary")
		ul
			- var i = 0;
			while i < 5
				-i++;
				li: a(href='#') Secondary nav		

	main
		article
			h1 Main article heading

			p Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quae sunt igitur communia vobis cum antiquis, iis sic utamur quasi concessis; Nihil acciderat ei, quod nollet, nisi quod anulum, quo delectabatur, in mari abiecerat. Unum est sine dolore esse, alterum cum voluptate. Laboro autem non sine causa; Theophrasti igitur, inquit, tibi liber ille placet de beata vita? Nihil opus est exemplis hoc facere longius. Duo Reges constructio interrete. Graecum enim hunc versum nostis omnes Suavis laborum est praeteritorum memoria. Haec et tu ita posuisti, et verba vestra sunt.

			h2 Article secondary heading

			p Nos commodius agimus. A mene tu? Tantum dico, magis fuisse vestrum agere Epicuri diem natalem, quam illius testamento cavere ut ageretur. Tenesne igitur, inquam, Hieronymus Rhodius quid dicat esse summum bonum, quo putet omnia referri oportere? Nihilo beatiorem esse Metellum quam Regulum. Sed quanta sit alias, nunc tantum possitne esse tanta. Philosophi autem in suis lectulis plerumque moriuntur. Esse enim, nisi eris, non potes.

			p Sunt enim quasi prima elementa naturae, quibus ubertas orationis adhiberi vix potest, nec equidem eam cogito consectari. Id Sextilius factum negabat. Quorum sine causa fieri nihil putandum est. Quae autem natura suae primae institutionis oblita est?

	aside(aria-label="Sidebar")
		section.share
			h2 Share
			ul
				li
					a(href='#') Facebook
				li
					a(href='#') Twitter
				li
					a(href='#') Email

		section.recommended
			h2 Recommended
			ul
				li
					article
						h3
							a(href='#') Related article
						p Article description
				li
					article
						h3
							a(href='#') Related article
						p Article description

	footer
		ul
			- var i = 0;
			while i < 5
				-i++;
				li: a(href='#') Footer link
!

CSS 

              
                
.visually-hidden {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}


body {
	max-width: 120ch;
	min-width: 800px;
	margin: 20px auto;
	padding: 20px;
	padding-bottom: 0;
	
	display: grid;
	grid-template:
		"header  header  header"
		"divider divider divider"
		"nav     main    sidebar"
		"footer  footer  footer" /
		 200px    1fr    200px;
	grid-gap: 20px 40px;
	
	&::before {
		content: '';
		display: block;
		grid-area: divider;
		border-bottom: 1px dashed #000;
	}
	
	> header {
		grid-area: header;
	}
}

.header {
	display: grid;
	grid-template: 
		"logo ........... ......" 1fr
		"logo primary-nav search" auto
		"logo ........... ......" 1fr /
		200px 1fr         200px;
	grid-gap: 0 40px;
}

.primary-nav {
	grid-area: primary-nav;
	display: flex;

	ul {
		flex-grow: 1;
		display: flex;
		list-style: none;
		padding: 0;
		margin-left: -20px;
	}
		
	li {
		margin-left: 20px;
		flex-grow: 1;
		display: flex;
		text-align: center;
	}
		
	a {
		display: flex;
		align-items: center;
		justify-content: center;
		width: 100%;
		background-color: #000;
		color: #fff;
		text-decoration: none;
		padding: 10px 20px;
	}
}

.logo {
	grid-area: logo;
	border: 3px solid #000;
	padding: 10px 20px;
	font-size: 2em;
	margin: 0;
	text-align: center;
	text-decoration: none;
	color: #000;
}

.search {
	grid-area: search;
	display: flex;
	align-items: flex-end;
	
	input {
		width: 100%;
	}
}

.secondary-nav {
	grid-area: nav;
	background-color: lightgray;
	padding: 20px;
	flex-grow: 1;

	
	ul {
		list-style: none;
		padding: 0;
		display: grid;
		width: 100%;
		grid-template-columns: 1fr;
		grid-gap: 10px;
	}
	
	li {
		display: flex;
		width: 100%;
	}
	
	a {
		background: #fff;
		flex-grow: 1;
		display: flex;
		align-items: center;
		justify-content: center;
		color: #000;
		text-decoration: none;
		font-weight: bold;
		padding: 28px 0;
	}
	
}

main {
	grid-area: main;
	
	p {
		&:last-child {
			margin-bottom: 0;
		}
	}
}

aside {
	grid-area: sidebar;
	background: lightgray;
	padding: 20px;
	
	section {
		margin-bottom: 2.5em;
	}
	
	h2 {
		margin: 0;
		margin-bottom: 0.5em;
		font-size: 1.2em;
	}
}

.share {
	ul {
		background: #fff;
		padding-top: 5px;
		padding-bottom: 15px;
	}
	li {
		margin-top: 0.5em;
	}
}

.recommended {
	ul {
		list-style: none;
		padding: 0;
	}
	li {
		background: #fff;
		padding: 10px;
		margin-top: 10px;
	}
	h3 {
		margin: 0;
		margin-bottom: 0.5em;
	}
	p {
		margin: 0;
	}
}

footer {
	grid-area: footer;
	padding: 20px;
	border-top: 1px dashed #000;
	margin-top: 20px;
	
	ul {
		display: block;
		list-style: none;
		padding: 0;
		text-align: center;
	}
	
	li {
		display: inline-block;
		margin-left: 10px;
	}
	
	a {
		color: #000;
		text-decoration: none;
	}
}

h1 {
	margin: 0;
	font-size: 2.5em;
}

h2 {
	font-size: 1.5em;
}

ul {
	margin: 0;
}

a {
	color: #000;
}
!

JS
!
999px

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