backdrop-ua-style.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-position/backdrop-ua-style.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>CSS Positioned Layout Test: ::backdrop UA styles"</title>

<link rel="author" title="Eyvind Lillesveen" href="mailto:eyvind.lillesveen@gmail.com">

<link rel="help" href="https://drafts.csswg.org/css-position-4/#backdrop">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

</head>

<div id="elm"></div>

<script>

    test(() => {

        const backdrop_style = getComputedStyle(elm, "::backdrop");

        assert_equals(backdrop_style.position, "fixed");

        assert_equals(backdrop_style.top, "0px");

        assert_equals(backdrop_style.right, "0px");

        assert_equals(backdrop_style.left, "0px");

        assert_equals(backdrop_style.bottom, "0px");

    }, "UA styles for ::backdrop");

</script>

</body>

</html>