Responsive Web Design with jQuery Grids

Responsive Web Design page with Ignite UI jQuery Hierarchical Grid and Twitter Bootstrap

HTML

<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.1/css/bootstrap-combined.min.css">
<script src="http://cdn-na.infragistics.com/jquery/20131/latest/js/infragistics.loader.js"></script>
<a href="#main" id="A_3">Skip to main content</a>
<div id="DIV_4">
</div>
<header id="HEADER_5">
	<nav id="NAV_6">
		<div id="DIV_7">
			<div id="DIV_8">
				<a href="https://slack.com/" id="A_9"></a>
				<svg id="svg_10">
					<g id="g_11">
						<path id="path_12">
						</path>
						<g id="g_13">
							<path id="path_14">
							</path>
							<path id="path_15">
							</path>
							<path id="path_16">
							</path>
						</g>
					</g>
				</svg>
				<svg id="svg_17">
					<path id="path_18">
					</path>
					<path id="path_19">
					</path>
					<path id="path_20">
					</path>
					<path id="path_21">
					</path>
					<path id="path_22">
					</path>
					<path id="path_23">
					</path>
					<path id="path_24">
					</path>
					<path id="path_25">
					</path>
					<path id="path_26">
					</path>
				</svg>
			</div>
			<ul id="UL_27">
				<li id="LI_28">
					 <span id="SPAN_29">Why Slack?</span>
					<nav id="NAV_30">
						 <small id="SMALL_31">About the Product</small>
						<div id="DIV_32">
							 <a href="https://slack.com/features" id="A_33">How it works</a> <a href="https://slack.com/security" id="A_34">Security</a> <a href="https://slack.com/customer-stories" id="A_35">Customers</a> <a href="https://slack.com/enterprise" id="A_36">Enterprise</a>
						</div>
					</nav>
				</li>
				<li id="LI_37">
					 <span id="SPAN_38">Solutions</span>
					<nav id="NAV_39">
						 <small id="SMALL_40">Slack for every team</small>
						<div id="DIV_41">
							 <a href="https://slack.com/solutions/engineering" id="A_42">Engineering</a> <a href="https://slack.com/solutions/sales" id="A_43">Sales</a> <a href="https://slack.com/solutions/information-technology" id="A_44">IT</a> <a href="https://slack.com/solutions/marketing"...

CSS

#BODY_1 {
    box-sizing: border-box;
    color: rgb(50, 54, 72);
    display: flex;
    height: 5803.44px;
    max-width: 100%;
    min-height: 546px;
    text-decoration: none solid rgb(50, 54, 72);
    text-size-adjust: 100%;
    width: 1905px;
    column-rule-color: rgb(50, 54, 72);
    perspective-origin: 952.5px 2901.72px;
    transform-origin: 952.5px 2901.72px;
    caret-color: rgb(50, 54, 72);
    border: 0px none rgb(50, 54, 72);
    flex-flow: column nowrap;
    font: normal normal 400 normal 16px / normal Slack-Averta, appleLogo, sans-serif;
    margin: 0px;
    outline: rgb(50, 54, 72) none 0px;
    overflow: hidden auto;
}/*#BODY_1*/

#BODY_1:after {
    box-sizing: border-box;
    color: rgb(50, 54, 72);
    display: block;
    text-decoration: none solid rgb(50, 54, 72);
    text-size-adjust: 100%;
    column-rule-color: rgb(50, 54, 72);
    caret-color: rgb(50, 54, 72);
    border: 0px none rgb(50, 54, 72);
    font: normal normal 400 normal 16px / normal Slack-Averta, appleLogo, sans-serif;
    outline: rgb(50, 54, 72) none 0px;
}/*#BODY_1:after*/

#BODY_1:before {
    box-sizing: border-box;
    color: rgb(50, 54, 72);
    display: block;
    text-decoration: none solid rgb(50, 54, 72);
    text-size-adjust: 100%;
    column-rule-color: rgb(50, 54, 72);
    caret-color: rgb(50, 54, 72);
    border: 0px none rgb(50, 54, 72);
    font: normal normal 400 normal 16px / normal Slack-Averta, appleLogo, sans-serif;
    outline: rgb(50, 54, 72) none 0px;
}/*#BODY_1:before*/

#IFRAME_2 {
    bottom: 546px;
    box-sizing: border-box;
    color: rgb(50, 54, 72);
    display: block;
    height: 0px;
    left: -2000px;
    position: absolute;
    right: 3905px;
    text-decoration: none solid rgb(50, 54, 72);
    text-size-adjust: 100%;
    top: 0px;
    width: 0px;
    column-rule-color: rgb(50, 54, 72);
    perspective-origin: 0px 0px;
    transform-origin: 0px 0px;
    caret-color: rgb(50, 54, 72);
    border: 0px none rgb(50, 54, 72);
    font: normal...