test_detached_style.html

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<!DOCTYPE HTML>

<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=1062578

-->

<head>

  <title>Test for creating style in shadow root of host not in document.</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=1062578">Bug 1062578</a>

<script>

SimpleTest.waitForExplicitFinish();

var content = '<div id="grabme"></div>';

createIframe(content)

  .then((aDocument) => {

    var host = aDocument.createElement("div");

    var shadow = host.attachShadow({mode: "open"});

    shadow.innerHTML = '<style> #inner { height: 200px; } </style><div id="inner">Hello</div>';

    var iframeWin = aDocument.defaultView;

    iframeWin.grabme.appendChild(host);

    var inner = shadow.getElementById("inner");

    is(iframeWin.getComputedStyle(inner).getPropertyValue("height"), "200px", "Style in shadow root should take effect.");

    SimpleTest.finish();

});

</script>

</body>

</html>