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Reliably get viewport dimensions in JS
/*!
An experiment in getting accurate visible viewport dimensions across devices
(c) 2012 Scott Jehl.
MIT/GPLv2 Licence
*/
function viewportSize(){
var test = document.createElement( "div" );
test.style.cssText = "position: fixed;top: 0;left: 0;bottom: 0;right: 0;";
document.documentElement.insertBefore( test, document.documentElement.firstChild );
var dims = { width: test.offsetWidth, height: test.offsetHeight };
document.documentElement.removeChild( test );
return dims;
}
// Notes:
// relies on position:fixed support, but it should work in browsers that partially support position: fixed like iOS4 and such...
//sample usage: var viewportwidth = viewportSize().width;
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