LayoutTests/http/tests/cache/stylesheet-sharing.html

<script src="../../js-test-resources/js-test-pre.js"></script>
<body>
<script>
jsTestIsAsync = true;

function waitForStylesheet(iframe, completionHandler)
{
    var link = iframe.contentDocument.getElementsByTagName('link')[0];
    if (internals.isStyleSheetLoadingSubresources(link)) {
        setTimeout(function () { waitForStylesheet(iframe, completionHandler) }, 10);
        return;
    }
    completionHandler(link);
}

function load(src, completionHandler)
{
    var iframe = document.createElement("iframe");
    iframe.src = "resources/stylesheet-html.py?sheet=" + src;
    iframe.onload = function () {
        iframe.contentDocument.body.offsetWidth;
        waitForStylesheet(iframe, completionHandler);
    };
    document.body.appendChild(iframe);
}

function testSharing(src, expected, completionHandler)
{
    load(src, function (linkA) {
        load(src, function (linkB) {
            styleSheetContentsShared = internals.isSharingStyleSheetContents(linkA, linkB);
            sheetB = linkB.sheet;
            debug(src);
            if (expected)
                shouldBeTrue("styleSheetContentsShared");
            else
                shouldBeFalse("styleSheetContentsShared");
            completionHandler();
        });
    });
}

testSharing("shareable.css", true, function () {
    testSharing("non-shareable.css", false, function () {
        testSharing("http://localhost:8000/cache/resources/shareable.css", true, function () {
            shouldThrowErrorName("sheetB.cssRules", "SecurityError");
            finishJSTest();
        });
    });
});

</script>

<script src="../../js-test-resources/js-test-post.js"></script>