iOS Native App Default Style implemented in CSS

dabblet.css

/* iOS Native App Default Style implemented in CSS */

/* Bootstrapping … */
* {
	margin: 0;
	padding: 0;
	font-size: inherit;
	-webkit-tap-highlight-color: rgba(0,0,0,0);
}

html, body {
	height: 100%;
}

body {
	font-family: "Helvetica Neue", sans-serif;
}

/* Striped blue app background */
#app {
	width: 100%;
	min-height: 100%;
	-webkit-text-size-adjust: none;
	background: linear-gradient(left, 
		#c5ccd4 5px,
		#cbd2d8 5px,
		#cbd2d8 7px
	);
	background-size: 7px 100%;
}

/* Navigation Bar */
.navigationbar {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	height: 44px;
	margin-bottom: 10px;
	background: #6d84a2 linear-gradient(
		top,
		rgba(255,255,255,.7),
		rgba(255,255,255,.4) 1px,
		rgba(255,255,255,.2) 22px,
		rgba(255,255,255,.15) 22px,
		rgba(255,255,255,0) 42px,
		rgba(0,0,0,.4)
	);
	text-align: center;
	line-height: 44px;
	color: white;
	font-size: 20px;
	font-weight: bold;
	text-shadow: rgba(0,0,0,.5) 0 -1px;
}

/* Content Area */
#content {
	padding: 54px 10px 59px 10px;
}


/* Menu List */
ul.menu {
	list-style: none;
	background: #FFF;
	border: 1px solid rgba(0,0,0,.27);
	border-radius: 8px;
	font-size: 17px;
}

ul.menu li {
	min-height: 19px;
	border-top: 1px solid rgba(0,0,0,.27);
	padding: 10px;
}        

ul.menu li:first-child {
	border-top: 0;
}

ul.menu li:first-child a {
	border-radius: 8px 8px 0 0;
}

ul.menu li:last-child a {
	border-radius: 0 0 8px 8px;
}

ul.menu li, ul.menu li a {
	color: #000;
	text-decoration: none;
	font-weight: bold;
	white-space: nowrap;
	overflow: hidden;
	text-overflow: ellipsis;
}

ul.menu li a {
	display: block;
	margin: -10px;
	padding: 10px;
}

ul.menu li a:active {
	background-color: #0275ee;
	color: #FFF;
}

/* Tab Bar */
.tabbar {
	position: fixed;
	bottom: 0;
	left: 0;
	right: 0;
	font-size: 10px;
	height: 49px;
	background: #000 linear-gradient(top, 
		#1C1C1C 0%,
		#1C1C1C 2%,
		#575757 2%,
		#303030 5%,
		#141414 51%,
		#000 51%,
		#000 100%
	);
}

.tabbar ul {
	display: box;
	box-pack: justify;
	box-orient: horizontal;
	list-style: none;
	height: 46px;
	padding-top: 1px;
}

.tabbar li {
	-webkit-box-flex: 1;
	height: 100%;
	text-align: center;
	overflow: hidden;
	text-overflow: ellipsis;
}

.tabbar a {
	display: block;
	box-sizing: border-box;
	height: 44px;
	margin: 2px;
	position: relative;
	font-weight: bold;
	color: #999;
	text-decoration: none;
	padding-top: 33px;
	overflow: hidden;
	border-radius: 4px;
	-webkit-touch-callout: none;
}

.tabbar li.active a {
	color: #FFF;
	background: rgba(255,255,255,.13);
}

.tabbar .icon {
	display: block;
	position: absolute;
	top: 2px;
	left: 50%;
	width: 30px;
	height: 30px;
	margin-left: -15px;
	background: #555 linear-gradient(top, rgba(255,255,255,0.3) 25%, rgba(255,255,255,0) 75%);
	-webkit-mask-size: 30px 30px;
	-webkit-mask-position: 50% 0;
}

.tabbar li.active .icon {
	background: linear-gradient(-84deg, #FFF 0%, #7db9ee 52%, rgba(0,0,0,0) 52%),
		    linear-gradient(top, #0429e4, #40cefb);
}

.tabbar li.one .icon {
	-webkit-mask-image: url(http://code.pb.io/ios-css/images/tabbar-icon-flower.png);
}

.tabbar li.two .icon {
	-webkit-mask-image: url(http://code.pb.io/ios-css/images/tabbar-icon-luggage.png);
}

.tabbar li.three .icon {
	-webkit-mask-image: url(http://code.pb.io/ios-css/images/tabbar-icon-ghost.png);
}

/* Info Text */
p.info {
	margin: 10px;
	text-align: center;
	font-size: 14px;
	color: #4c566c;
	text-shadow: rgba(255,255,255,.75) 0 1px;
}

dabblet.html

<meta name="viewport" content="initial-scale=1, user-scalable=no" />
<meta name="apple-mobile-web-app-capable" content="yes" />

<div id="app">
    <section class="panel has-navigationbar">
        <header class="navigationbar">
            <h1>Some title</h1>
        </header>
        <footer class="tabbar">
            <ul>
                <li class="one active">
                    <a href="#">
                        <span class="icon"></span>
                        foo
                    </a>
                </li>
                <li class="two">
                    <a href="#">
                        <span class="icon"></span>
                        bar
                    </a>
                </li>
                <li class="three">
                    <a href="#">
                        <span class="icon"></span>
                        baz
                    </a>
                </li>
            </ul>
        </footer>
        <section id="content">
            <ul class="menu">
                <li>
                    Foo
                </li>
                <li>
                    Bar
                </li>
                <li>
                    <a href="#">Baz</a>
                </li>
                <li>
                    <a href="#">Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</a>
                </li>
            </ul>
            <p class="info">
                Best viewed on Interne… eh … some flavor of Webkit.
            </p>
        </section>
    </section>
</div>

<script>
    var tabs = document.querySelectorAll('.tabbar li'),
        switchTab = function() {
            for (var j=0, k=tabs.length; j<k; j++) {
                tabs[j].className = tabs[j].className.replace(/ active/, '');
            }
            this.className += ' active';
        };
    for (var i=0, l=tabs.length; i<l; i++) {
        tabs[i].addEventListener('ontouchend' in window ? 'touchend' : 'click', switchTab, false);
    }
</script>

settings.json

{"view":"split-vertical","prefixfree":"1","page":"css"}

I'm just playing around with this but the gradient on the tab bar and other features seem to not be working, is this still being supported by up to date browsers?