Subway navigation: Canada.ca design system

<nav class="provisional gc-subway">
	<h1 id="gc-document-nav">[Service name]</h1>
	<ul>
		<li>
			<a href="#" class="active" aria-current="page">[Page 1]</a>
		</li>
		<li>
			<a href="#" class="hidden-xs hidden-sm">[Page 2]</a>
			<a href="#gc-document-nav" class="visible-xs visible-sm">[Page 2]</a>
		</li>
		<li>
			<a href="#" class="hidden-xs hidden-sm">[Page 3]</a>
			<a href="#gc-document-nav" class="visible-xs visible-sm">[Page 3]</a>
		</li>
		<li>
			<a href="#" class="hidden-xs hidden-sm">[Page 4]</a>
			<a href="#gc-document-nav" class="visible-xs visible-sm">[Page 4]</a>
		</li>
		<li>
			<a href="#" class="hidden-xs hidden-sm">[Page 5]</a>
			<a href="#gc-document-nav" class="visible-xs visible-sm">[Page 5]</a>
		</li>
		<li>
			<a href="#" class="hidden-xs hidden-sm">[Page 6]</a>
			<a href="#gc-document-nav" class="visible-xs visible-sm">[Page 6]</a>
		</li>
	</ul>
</nav>

<h1 property="name" id="wb-cont" class="gc-thickline">[Page 1]</h1>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam commodo elementum est, ac ultrices urna convallis vitae. Nulla nec convallis felis. Ut pretium nisl nisi. Nam gravida gravida aliquet. Morbi tincidunt lorem in purus imperdiet, id rutrum mauris sodales. Vivamus nec mattis tellus. Nunc turpis dolor, malesuada non magna nec, scelerisque tristique velit.</p>
<p>Sed consectetur eu ligula a molestie. Vivamus convallis libero malesuada pharetra suscipit. In a pulvinar mi, quis aliquet mauris. Duis convallis nunc nunc, in euismod nisi volutpat sit amet. Integer convallis lacus non orci imperdiet, ac convallis massa mollis. Aliquam erat volutpat. Ut maximus euismod auctor. Ut ac gravida nunc. Nam non efficitur neque. Pellentesque tincidunt, libero luctus condimentum laoreet, turpis magna maximus nibh, at cursus lectus tellus in augue. Aenean scelerisque eros dui, at tincidunt eros tristique nec.</p>
<nav class="mrgn-bttm-lg mrgn-tp-lg">
	<h3 class="wb-inv">Document navigation</h3>
	<ul class="pager">
		<li class="next"><a href="#wb-cont" rel="next"><span class="wb-inv">Next: </span>[Page 2]</a></li>
	</ul>
</nav>

.provisional.gc-subway {
		border-radius: 0px 6px 6px 0px;
		border-right: 4px solid #26374a;
		border-top: 4px solid #26374a;
		margin-top: 38px;
	}
	.provisional.gc-subway ul {
		clear: both;
		list-style: none;
		padding-left: .57em;
		padding-top: 10px;
		position: relative;
	}
	.provisional.gc-subway ul li {
		border-left: 4px solid #26374a;
		padding: 0px 20px 30px 1em;
	}
	.provisional.gc-subway ul li::first-line {
		line-height: 1 !important;
	}
	.provisional.gc-subway ul li :first-child::before {
		background-color: #fff;
		border: 3px solid #26374a;
		border-radius: 50%;
		content: "";
		height: 1.2em;
		left: .05em;
		position: absolute;
		-webkit-transition: width .2s, height .2s, left .2s, margin-top .2s;
		transition: width .2s, height .2s, left .2s, margin-top .2s;
		width: 1.2em;
	}
	.provisional.gc-subway ul li.active > :first-child::before {
		background-color: #26374a;
	}
	.provisional.gc-subway ul li a[href]:hover::before,
	.provisional.gc-subway ul li a[href]:focus::before {
		height: 1.4em;
		left: -.05em;
		margin-top: -.1em;
		width: 1.4em;
	}
	.provisional.gc-subway ul li:last-child {
		border-bottom: 4px solid #26374a;
		border-bottom-left-radius: 6px;
		border-left: 4px solid #26374a;
	}
	.provisional.gc-subway ul li ul {
		margin-top: 20px;
		padding-left: .55em;
	}
	.provisional.gc-subway ul li ul li:last-child {
		border-bottom-width: 0px;
		padding-bottom: 0px;
	}
	.provisional.gc-subway ul li ul.noline li {
		-o-border-image: none;
		border-image: none;
		border-left: 4px solid transparent;
	}
	.provisional.gc-subway h1 {
		float: left;
	}
	.provisional.gc-subway h1,
	.provisional.gc-subway-section .gc-subway-h1 {
		background-color: #fff;
		border-bottom-width: 0px;
		color: #555;
		font-size: 1.3em;
		margin-right: 20px;
		margin-top: -19px;
		padding: 0px 20px 10px 0px;
	}
	@media screen and (min-width: 992px) {
		.provisional.gc-subway {
		border-right: 0;
		border-top: 0;
		display: none;
		margin-top: 25px;
		padding-left: 15px;
		}
		.provisional.gc-subway.no-blink {
		display: block;
		}
		.provisional.gc-subway .gc-subway-menu-nav {
		float: right;
		width: 33.33%;
		}
		.provisional.gc-subway ul li:last-child {
		border-bottom: 0;
		border-left: 4px solid transparent;
		}
		.provisional.gc-subway-section {
		padding-right: 15px;
		width: 66.66%;
		}
		.provisional.gc-subway-section .gc-subway-h1,
		.provisional.gc-subway-section h1 {
		margin-top: 0;
		}
		.provisional.gc-subway-section .gc-subway-h1 {
		font-family: Lato, sans-serif;
		font-weight: inherit;
		margin-bottom: 0;
		margin-right: 0;
		padding-bottom: 0 !important;
		padding-left: 0;
		}
		.wb-disable .provisional.gc-subway {
		display: block;
		}
	}

( function( $, window, wb ) {
"use strict";

var $document = wb.doc,
	componentName = "gc-subway",
	selector = ".provisional." + componentName,
	initEvent = "wb-init ." + componentName,
	views = {
		xxs: "xxsmallview",
		xs: "xsmallview",
		sm: "smallview",
		md: "mediumview",
		lg: "largeview",
		xl: "xlargeview"
	},
	mainClass = "gc-subway-section",
	toggleClass = "wb-inv",
	desktopInited = false,
	skipLink = false,
	$html = wb.html,
	$h1, $h2, $h1Copy, $menu, $main,

	/**
	 * @method init
	 * @param {jQuery Event} event Event that triggered the function call
	 */
	init = function( event ) {

		// Start initialization
		// returns DOM object = proceed with init
		// returns undefined = do not proceed with init (e.g., already initialized)
		var elm = wb.init( event, componentName, selector ),
			h1,
			$elm;

		if ( elm ) {
			$elm = $( elm );
			$h1 = $( "h1", $elm );
			h1 = $h1.get( 0 );

			// Ensure the element have an ID
			if ( !h1.id ) {
				h1.id = wb.getId();
			}

			// Add subway H1 to skip links
			if ( !skipLink ) {
				skipLink = wb.addSkipLink( wb.i18n( "skip-prefix" ) + " " + h1.textContent, { href: "#" + h1.id } );
			}

			// trigger resizing
			onResize( $elm );

			// Identify that initialization has completed
			wb.ready( $elm, componentName );
		}
	},

	/**
	 * Mutate DOM depending on breakpoint
	 * @method onResize
	 * @param {jQuery DOM element | jQuery Event} $elm Element targetted by this plugin, which is the nav | Resizing event
	 */
	onResize = function( $elm ) {

		if ( !$elm.length ) {
			$elm = $( selector );
		}

		// Ensure the page contains at least two heading level 1
		if ( $( "main h1" ).length < 2 ) {
			$document.off( wb.resizeEvents, onResize );
			$elm.addClass( "no-blink p-0" );
			return;
		}

		// Desktop view, setup and mutate H1s
		if ( $html.hasClass( views.md ) || $html.hasClass( views.lg ) ||
			$html.hasClass( views.xl ) ) {

			// Initiate desktop mode only once
			if ( !desktopInited ) {
				initDesktop( $elm );
			}
			$h1.addClass( toggleClass );
			$h1Copy.prependTo( $main );
			$h2.prependTo( $menu );
		} else if ( ( $html.hasClass( views.sm ) || $html.hasClass( views.xs ) || $html.hasClass( views.xxs ) ) && desktopInited ) {

			// Mobile view, mutate back to mobile first if needed
			$h1.removeClass( toggleClass );
			$h1Copy.remove();
			$( "h2:first-child", $menu ).remove();
		}
	},

	/**
	 * Initate setup for desktop mode
	 * @method initDesktop
	 * @param {jQuery DOM element} $elm Element targetted by this plugin, which is the nav
	 */
	initDesktop = function( $elm ) {
		$h2 = $( "<h2 class='h3 hidden-xs visible-md visible-lg mrgn-tp-0'>Sections</h2>" );
		$h1Copy = $( "<div class='gc-subway-h1' aria-hidden='true'>" + $h1.text() + "</div>" );
		$( "ul", $elm ).first().wrap( "<div class='gc-subway-menu-nav'></div>" );
		$menu = $( ".gc-subway-menu-nav", $elm );
		$elm.nextUntil( ".pagedetails, .gc-subway-section-end" ).wrapAll( "<section class='provisional " + mainClass + "'>" );
		$main = $elm.next();

		// Prevent on-load blinking on desktop
		$elm.addClass( "no-blink" );

		desktopInited = true;
	};

// Listen for resizing and mutate the DOM accordingly
$document.on( wb.resizeEvents, onResize );

// Bind the init event of the plugin
$document.on( "timerpoke.wb " + initEvent, selector + ".provisional", init );

// Add the timer poke to initialize the plugin
wb.add( selector );

} )( jQuery, window, wb );