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define( [
"../core",
"../var/document",
"../var/documentElement",
"../var/support"
], function( jQuery, document, documentElement, support ) {
( function() {
var pixelPositionVal, boxSizingReliableVal, pixelMarginRightVal,
container = document.createElement( "div" ),
div = document.createElement( "div" );
// Finish early in limited (non-browser) environments
if ( !div.style ) {
return;
}
// Support: IE9-11+
// Style of cloned element affects source element cloned (#8908)
div.style.backgroundClip = "content-box";
div.cloneNode( true ).style.backgroundClip = "";
support.clearCloneStyle = div.style.backgroundClip === "content-box";
container.style.cssText = "border:0;width:8px;height:0;top:0;left:-9999px;" +
"padding:0;margin-top:1px;position:absolute";
container.appendChild( div );
// Executing both pixelPosition & boxSizingReliable tests require only one layout
// so they're executed at the same time to save the second computation.
function computeStyleTests() {
div.style.cssText =
"box-sizing:border-box;" +
"display:block;position:absolute;" +
"margin:0;margin-top:1%;margin-right:50%;" +
"border:1px;padding:1px;" +
"top:1%;width:50%;height:4px";
div.innerHTML = "";
documentElement.appendChild( container );
var divStyle = window.getComputedStyle( div );
pixelPositionVal = divStyle.top !== "1%";
boxSizingReliableVal = divStyle.height === "4px";
pixelMarginRightVal = divStyle.marginRight === "4px";
documentElement.removeChild( container );
}
jQuery.extend( support, {
pixelPosition: function() {
// This test is executed only once but we still do memoizing
// since we can use the boxSizingReliable pre-computing.
// No need to check if the test was already performed, though.
computeStyleTests();
return pixelPositionVal;
},
boxSizingReliable: function() {
if ( boxSizingReliableVal == null ) {
computeStyleTests();
}
return boxSizingReliableVal;
},
pixelMarginRight: function() {
// Support: Android 4.0-4.3
// We're checking for boxSizingReliableVal here instead of pixelMarginRightVal
// since that compresses better and they're computed together anyway.
if ( boxSizingReliableVal == null ) {
computeStyleTests();
}
return pixelMarginRightVal;
}
} );
} )();
return support;
} );
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