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// feature test for position fixed.
 
Modernizr.addTest('positionfixed', function () {
var test = document.createElement('div'),
control = test.cloneNode(false),
fake = false,
root = document.body || (function () {
fake = true;
return document.documentElement.appendChild(document.createElement('body'));
}());
 
var oldCssText = root.style.cssText;
root.style.cssText = 'padding:0;margin:0';
test.style.cssText = 'position:fixed;top:42px';
root.appendChild(test);
root.appendChild(control);
var ret = test.offsetTop !== control.offsetTop;
 
root.removeChild(test);
root.removeChild(control);
root.style.cssText = oldCssText;
if (fake) {
document.documentElement.removeChild(root);
}
 
return ret;
});
Owner

jQuery actually has some detection code for this as well:

https://github.com/jquery/jquery/blob/eed380/src/offset.js#L125-143

Owner

Current state of this detect is here https://github.com/Modernizr/Modernizr/issues/167

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