gecko-dev/layout/reftests/image/image-object-fit-dyn-1.html

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<!DOCTYPE html>
<!--
Any copyright is dedicated to the Public Domain.
http://creativecommons.org/publicdomain/zero/1.0/
-->
<!--
This testcase ensures that we repaint correctly when "object-fit" is
adjusted on a replaced element with SVG content. We start with
"object-fit: contain", which lets some of the red background show through
as we fit the SVG's square aspect-ratio into the wide rectangular
container elements. We then change dynamically to "object-fit: cover",
which should scale our SVG content to cover each replaced element's
content-box. No red should ultimately be visible in the reftest snapshot.
-->
<html class="reftest-wait">
<head>
<meta charset="utf-8">
<style type="text/css">
embed, img, object, video {
object-fit: contain;
background: red;
width: 50px;
height: 30px;
}
</style>
<script>
function go() {
var elemsToTweak = ["embed", "img", "object", "video"];
elemsToTweak.forEach(tweakElemObjectFit);
document.documentElement.removeAttribute("class");
}
function tweakElemObjectFit(tagName) {
var elem = document.getElementsByTagName(tagName)[0];
elem.style.objectFit = "cover";
}
document.addEventListener("MozReftestInvalidate", go);
</script>
</head>
<body>
<embed src="500.svg">
<img src="500.svg">
<object data="500.svg"></object>
<video poster="500.svg"></video>
</body>
</html>