test_shadowroot_style_order.html

mozilla-central/dom/tests/mochitest/webcomponents/test_shadowroot_style_order.html (file symbol)

Enable keyboard shortcuts

Source code

File a bug in Core :: DOM: Core & HTML

Revision control

Copy as Markdown

Other Tools

Test Info:

Manifest: dom/tests/mochitest/webcomponents/mochitest.toml

<!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>