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firefox/dom/tests/mochitest/webcomponents/test_style_fallback_content.html
Daniel Baumann 5e9a113729
Adding upstream version 140.0.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
2025-06-25 09:37:52 +02:00

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HTML

<!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>