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// Sticky positioning - constrains an element to be positioned inside the
// intersection of its container box, and the viewport.
Modernizr.addTest('csspositionsticky', function () {
var prop = 'position:';
var value = 'sticky';
var el = document.createElement('modernizr');
var mStyle = el.style;
mStyle.cssText = prop + Modernizr._prefixes.join(value + ';' + prop).slice(0, -prop.length);
return mStyle.position.indexOf(value) !== -1;
});