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define( [
"../core",
"../var/document",
"../var/documentElement",
"../var/support"
], function( jQuery, document, documentElement, support ) {
( function() {
var pixelPositionVal, pixelMarginRightVal, boxSizingReliableVal,
reliableHiddenOffsetsVal, reliableMarginRightVal, reliableMarginLeftVal,
container = document.createElement( "div" ),
div = document.createElement( "div" );
// Finish early in limited (non-browser) environments
if ( !div.style ) {
return;
}
div.style.cssText = "float:left;opacity:.5";
// Support: IE<9
// Make sure that element opacity exists (as opposed to filter)
support.opacity = div.style.opacity === "0.5";
// Verify style float existence
// (IE uses styleFloat instead of cssFloat)
support.cssFloat = !!div.style.cssFloat;
div.style.backgroundClip = "content-box";
div.cloneNode( true ).style.backgroundClip = "";
support.clearCloneStyle = div.style.backgroundClip === "content-box";
container = document.createElement( "div" );
container.style.cssText = "border:0;width:8px;height:0;top:0;left:-9999px;" +
"padding:0;margin-top:1px;position:absolute";
div.innerHTML = "";
container.appendChild( div );
// Support: Firefox<29, Android 2.3
// Vendor-prefix box-sizing
support.boxSizing = div.style.boxSizing === "" || div.style.MozBoxSizing === "" ||
div.style.WebkitBoxSizing === "";
jQuery.extend( support, {
reliableHiddenOffsets: function() {
if ( pixelPositionVal == null ) {
computeStyleTests();
}
return reliableHiddenOffsetsVal;
},
boxSizingReliable: function() {
// We're checking for pixelPositionVal here instead of boxSizingReliableVal
// since that compresses better and they're computed together anyway.
if ( pixelPositionVal == null ) {
computeStyleTests();
}
return boxSizingReliableVal;
},
pixelMarginRight: function() {
// Support: Android 4.0-4.3
if ( pixelPositionVal == null ) {
computeStyleTests();
}
return pixelMarginRightVal;
},
pixelPosition: function() {
if ( pixelPositionVal == null ) {
computeStyleTests();
}
return pixelPositionVal;
},
reliableMarginRight: function() {
// Support: Android 2.3
if ( pixelPositionVal == null ) {
computeStyleTests();
}
return reliableMarginRightVal;
},
reliableMarginLeft: function() {
// Support: IE <=8 only, Android 4.0 - 4.3 only, Firefox <=3 - 37
if ( pixelPositionVal == null ) {
computeStyleTests();
}
return reliableMarginLeftVal;
}
} );
function computeStyleTests() {
var contents, divStyle,
documentElement = document.documentElement;
// Setup
documentElement.appendChild( container );
div.style.cssText =
// Support: Android 2.3
// Vendor-prefix box-sizing
"-webkit-box-sizing:border-box;box-sizing:border-box;" +
"position:relative;display:block;" +
"margin:auto;border:1px;padding:1px;" +
"top:1%;width:50%";
// Support: IE<9
// Assume reasonable values in the absence of getComputedStyle
pixelPositionVal = boxSizingReliableVal = reliableMarginLeftVal = false;
pixelMarginRightVal = reliableMarginRightVal = true;
// Check for getComputedStyle so that this code is not run in IE<9.
if ( window.getComputedStyle ) {
divStyle = window.getComputedStyle( div );
pixelPositionVal = ( divStyle || {} ).top !== "1%";
reliableMarginLeftVal = ( divStyle || {} ).marginLeft === "2px";
boxSizingReliableVal = ( divStyle || { width: "4px" } ).width === "4px";
// Support: Android 4.0 - 4.3 only
// Some styles come back with percentage values, even though they shouldn't
div.style.marginRight = "50%";
pixelMarginRightVal = ( divStyle || { marginRight: "4px" } ).marginRight === "4px";
// Support: Android 2.3 only
// 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
contents = div.appendChild( document.createElement( "div" ) );
// Reset CSS: box-sizing; display; margin; border; padding
contents.style.cssText = div.style.cssText =
// Support: 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";
contents.style.marginRight = contents.style.width = "0";
div.style.width = "1px";
reliableMarginRightVal =
!parseFloat( ( window.getComputedStyle( contents ) || {} ).marginRight );
div.removeChild( contents );
}
// Support: IE8
// Check if table cells still have offsetWidth/Height when they are set
// to display:none and there are still other visible table cells in a
// table row; if so, offsetWidth/Height are not reliable for use when
// determining if an element has been hidden directly using
// display:none (it is still safe to use offsets if a parent element is
// hidden; don safety goggles and see bug #4512 for more information).
div.innerHTML = "<table><tr><td></td><td>t</td></tr></table>";
contents = div.getElementsByTagName( "td" );
contents[ 0 ].style.cssText = "margin:0;border:0;padding:0;display:none";
reliableHiddenOffsetsVal = contents[ 0 ].offsetHeight === 0 &&
contents[ 0 ].getClientRects().length === 0;
if ( reliableHiddenOffsetsVal ) {
contents[ 0 ].style.display = "";
contents[ 1 ].style.display = "none";
reliableHiddenOffsetsVal = contents[ 0 ].offsetHeight === 0;
}
// Teardown
documentElement.removeChild( container );
}
} )();
return support;
} );
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