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<!DOCTYPE html>
<html class="reftest-wait reftest-no-flush">
<meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1">
<style>
html {
overflow: hidden;
}
body {
margin: 0px;
padding: 0px;
}
@keyframes anim {
/* The reftest window size is (800x1000), which means the partial prerender */
/* area is (1125x900). Thus -325px(= 800 - 1125) is the boundary where jank */
/* happens, so we choose a value close to -325px so that within a next */
/* couple of frames jank should happen. */
0% { transform: translateX(-324px); }
100% { transform: translateX(-2000px); }
}
#target {
width: 1600px;
/* Use a smallar value than the reftest window height to avoid bloating up */
/* svg inside this element beyond the window height */
height: 900px;
position: absolute;
transform: translateX(0px);
}
</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.
Note: As SVG items get "webrenderized" this test won't work. For now
rounded rectangles go through the blob path.
-->
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1600 900">
<!-- green on the pre-render area -->
<rect fill="green" x="0" width="1125" height="900" rx="0.1"></rect>
<rect fill="red" x="1125" width="875" height="900" rx="0.1"></rect>
</svg>
</div>
<script>
document.addEventListener("MozReftestInvalidate", () => {
// A shorter animation-duration than we normally use (100s) because if we used
// the longer duration it may NOT fail this test even if any jank happens.
target.style.animation = "anim 10s 1s";
target.addEventListener("animationstart", () => {
// Wait a second to make sure the animation gets stucked (i.e. jank) at the
// boundary (325px).
setTimeout(() => {
document.documentElement.classList.remove("reftest-wait");
}, 1000);
});
}, { once: true });
</script>
</html>
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