define( [
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"../core",
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"../var/document",
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"../var/documentElement",
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"../var/support"
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], function( jQuery, document, documentElement, support ) {
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"use strict";
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( function() {
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// Executing both pixelPosition & boxSizingReliable tests require only one layout
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// so they're executed at the same time to save the second computation.
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function computeStyleTests() {
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// This is a singleton, we need to execute it only once
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if ( !div ) {
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return;
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}
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div.style.cssText =
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"box-sizing:border-box;" +
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"position:relative;display:block;" +
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"margin:auto;border:1px;padding:1px;" +
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"top:1%;width:50%";
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div.innerHTML = "";
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documentElement.appendChild( container );
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var divStyle = window.getComputedStyle( div );
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pixelPositionVal = divStyle.top !== "1%";
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// Support: Android 4.0 - 4.3 only, Firefox <=3 - 44
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reliableMarginLeftVal = divStyle.marginLeft === "2px";
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boxSizingReliableVal = divStyle.width === "4px";
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// Support: Android 4.0 - 4.3 only
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// Some styles come back with percentage values, even though they shouldn't
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div.style.marginRight = "50%";
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pixelMarginRightVal = divStyle.marginRight === "4px";
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documentElement.removeChild( container );
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// Nullify the div so it wouldn't be stored in the memory and
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// it will also be a sign that checks already performed
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div = null;
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}
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var pixelPositionVal, boxSizingReliableVal, pixelMarginRightVal, reliableMarginLeftVal,
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container = document.createElement( "div" ),
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div = document.createElement( "div" );
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// Finish early in limited (non-browser) environments
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if ( !div.style ) {
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return;
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}
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// Support: IE <=9 - 11 only
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// Style of cloned element affects source element cloned (#8908)
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div.style.backgroundClip = "content-box";
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div.cloneNode( true ).style.backgroundClip = "";
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support.clearCloneStyle = div.style.backgroundClip === "content-box";
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container.style.cssText = "border:0;width:8px;height:0;top:0;left:-9999px;" +
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"padding:0;margin-top:1px;position:absolute";
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container.appendChild( div );
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jQuery.extend( support, {
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pixelPosition: function() {
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computeStyleTests();
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return pixelPositionVal;
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},
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boxSizingReliable: function() {
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computeStyleTests();
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return boxSizingReliableVal;
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},
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pixelMarginRight: function() {
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computeStyleTests();
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return pixelMarginRightVal;
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},
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reliableMarginLeft: function() {
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computeStyleTests();
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return reliableMarginLeftVal;
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}
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} );
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} )();
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return support;
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} );
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