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Test Info:

<!DOCTYPE html>
<html class="reftest-wait reftest-no-flush">
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
<style>
html {
overflow: hidden;
}
body {
margin: 0px;
padding: 0px;
}
@keyframes anim {
from { transform: translateX(0px); }
}
#target {
width: 200vw;
height: 100vh;
position: absolute;
/* Some part of this element needs to be visible initially so that */
/* a display item for this element is generated, thus the transform */
/* animation runs on the compositor. */
transform: translateX(90vw);
}
</style>
<div id="target">
<!--
Put an SVG element so that the transform display item has a blob on
Webrender which means this test properly fails without the proper fix.
-->
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16">
<rect fill="green" width="16" height="16"></rect>
</svg>
</div>
<script>
// Waiting MozReftestInvalidate event makes this test fail for some reasons.
// so we use window.onload instead.
window.onload = () => {
target.style.animation = "anim 100s step-end reverse";
target.addEventListener("animationstart", () => {
document.documentElement.classList.remove("reftest-wait");
});
};
</script>
</html>