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Test Info:
<!DOCTYPE HTML>
<html>
<!--
-->
<head>
<title>Test for ShadowRoot style order</title>
<script type="text/javascript" src="head.js"></script>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<script>
SimpleTest.waitForExplicitFinish();
var content = '<div id="container"></div>';
createIframe(content)
.then((aDocument) => {
var iframeWin = aDocument.defaultView;
// Create ShadowRoot.
var container = aDocument.getElementById("container");
var elem = aDocument.createElement("div");
container.appendChild(elem); // Put ShadowRoot host in document.
var root = elem.attachShadow({mode: "open"});
// Style elements that will be appended into the ShadowRoot.
var tallShadowStyle = aDocument.createElement("style");
tallShadowStyle.innerHTML = ".tall { height: 100px; }";
var veryTallShadowStyle = aDocument.createElement("style");
veryTallShadowStyle.innerHTML = ".tall { height: 200px; }";
var divToStyle = aDocument.createElement("div");
divToStyle.setAttribute("class", "tall");
root.appendChild(divToStyle);
// Make sure the styles are applied in tree order.
root.appendChild(tallShadowStyle);
is(root.styleSheets.length, 1, "ShadowRoot should have one style sheet.");
is(iframeWin.getComputedStyle(divToStyle).getPropertyValue("height"), "100px", "Style in ShadowRoot should apply to elements in ShadowRoot.");
root.appendChild(veryTallShadowStyle);
is(root.styleSheets.length, 2, "ShadowRoot should have two style sheets.");
is(iframeWin.getComputedStyle(divToStyle).getPropertyValue("height"), "200px", "Style in ShadowRoot should apply to elements in ShadowRoot in tree order.");
SimpleTest.finish();
});
</script>
</body>
</html>