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Test Info:
- Manifest: layout/reftests/transform/reftest.list
<!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 of (400x400) clipped target is (1125x400). Thus -725px(= 400 - 1125)*/
/* is the boundary where jank happens, so we choose a value close to -725px */
/* so that within a next couple of frames jank should happen. */
0% { transform: translateX(-724px); }
100% { transform: translateX(-2000px); }
}
</style>
style="overflow: scroll">
<g id="target">
<rect fill="green" x="0" width="1125" height="400"></rect>
<rect fill="red" x="1125" width="800" height="400"></rect>
</svg>
</g>
</svg>
<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 (725px).
setTimeout(() => {
document.documentElement.classList.remove("reftest-wait");
}, 1000);
});
}, { once: true });
</script>
</html>