54 lines
1.8 KiB
HTML
54 lines
1.8 KiB
HTML
<!DOCTYPE html>
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<html class="reftest-wait reftest-no-flush">
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<meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1">
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<!--
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A test for a partial pre-rendered transform animation moves to a place where
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the whole area of the transform animation is out of the viewport.
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We consider it jank, thus we report it to the main-thread, then we clear out
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the initial green rectangle, thus the result should be a blank page.
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-->
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<style>
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html {
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overflow: hidden;
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}
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body {
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margin: 0px;
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padding: 0px;
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}
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@keyframes anim {
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/* translate to a position the element is completely outside of the */
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/* viewport */
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to { transform: translateX(-300vw); }
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}
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#target {
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width: 200vw;
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height: 200vh;
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position: absolute;
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/* Some part of this element needs to be visible initially so that */
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/* a display item for this element is generated, thus the transform */
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/* animation runs on the compositor. */
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transform: translateX(-110vw);
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}
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</style>
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<div id="target">
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<!--
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Put an SVG element so that the transform display item has a blob on
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WebRender which means this test properly fails without the proper fix.
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-->
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16">
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<rect fill="green" width="16" height="16"></rect>
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</svg>
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</div>
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<script>
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document.addEventListener("MozReftestInvalidate", () => {
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target.style.animation = "anim 100s 1s step-start";
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target.addEventListener("animationstart", () => {
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// Wait 100ms to make sure we can report the jank to the main-thread and
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// in response to the report we can do a paint process on the main-thread.
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setTimeout(() => {
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document.documentElement.classList.remove("reftest-wait");
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}, 100);
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});
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}, { once: true });
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</script>
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</html>
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