trotzig/diffux

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;

});