test_style_fallback_content.html

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<!DOCTYPE HTML>

<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=806506

-->

<head>

  <title>Test for styling fallback content</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="grabme"></div>';

createIframe(content)

  .then((aDocument) => {

    var iframeWin = aDocument.defaultView;

    var host = aDocument.getElementById("grabme");

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

    shadow.innerHTML = '<style id="innerstyle"></style><span id="container"><slot><span id="innerspan">Hello</span></slot></span>';

    var innerStyle = shadow.getElementById("innerstyle");

    innerStyle.innerHTML = '#innerspan { margin-top: 10px; }';

    var innerSpan = shadow.getElementById("innerspan");

    is(iframeWin.getComputedStyle(innerSpan).getPropertyValue("margin-top"), "10px", "Default content should be style by id selector.");

    innerStyle.innerHTML = '#container > slot > #innerspan { margin-top: 30px; }';

    is(iframeWin.getComputedStyle(innerSpan).getPropertyValue("margin-top"), "30px", "Default content should be style by child combinators.");

    SimpleTest.finish();

});

</script>

</body>

</html>