<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=806506
-->
<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>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=806506">Bug 806506</a>
<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>
