support.js
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define([
"../core",
"../var/support"
], function( jQuery, support ) {
(function() {
var pixelPositionVal, boxSizingReliableVal,
docElem = document.documentElement,
container = document.createElement( "div" ),
div = document.createElement( "div" );
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:0;height:0;top:0;left:-9999px;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 computePixelPositionAndBoxSizingReliable() {
div.style.cssText =
// Support: Firefox<29, Android 2.3
// Vendor-prefix box-sizing
"-webkit-box-sizing:border-box;-moz-box-sizing:border-box;" +
"box-sizing:border-box;display:block;margin-top:1%;top:1%;" +
"border:1px;padding:1px;width:4px;position:absolute";
div.innerHTML = "";
docElem.appendChild( container );
var divStyle = window.getComputedStyle( div, null );
pixelPositionVal = divStyle.top !== "1%";
boxSizingReliableVal = divStyle.width === "4px";
docElem.removeChild( container );
}
// Support: node.js jsdom
// Don't assume that getComputedStyle is a property of the global object
if ( window.getComputedStyle ) {
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.
computePixelPositionAndBoxSizingReliable();
return pixelPositionVal;
},
boxSizingReliable: function() {
if ( boxSizingReliableVal == null ) {
computePixelPositionAndBoxSizingReliable();
}
return boxSizingReliableVal;
},
reliableMarginRight: function() {
// Support: Android 2.3
// Check if div with explicit width and no margin-right incorrectly
// gets computed margin-right based on width of container. (#3333)
// WebKit Bug 13343 - getComputedStyle returns wrong value for margin-right
// This support function is only executed once so no memoizing is needed.
var ret,
marginDiv = div.appendChild( document.createElement( "div" ) );
// Reset CSS: box-sizing; display; margin; border; padding
marginDiv.style.cssText = div.style.cssText =
// Support: Firefox<29, Android 2.3
// Vendor-prefix box-sizing
"-webkit-box-sizing:content-box;-moz-box-sizing:content-box;" +
"box-sizing:content-box;display:block;margin:0;border:0;padding:0";
marginDiv.style.marginRight = marginDiv.style.width = "0";
div.style.width = "1px";
docElem.appendChild( container );
ret = !parseFloat( window.getComputedStyle( marginDiv, null ).marginRight );
docElem.removeChild( container );
div.removeChild( marginDiv );
return ret;
}
});
}
})();
return support;
});