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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">
<!--
A test that a partial pre-rendered transform animation is transformed by an
ancestor transform value.
If we don't factor the ancestor's transform, we mis-recognize janks, which
means janked at the initial translateX(0vw) position, thus white blank area
will appears.
-->
<style>
html {
overflow: hidden;
}
body {
margin: 0px;
padding: 0px;
}
@keyframes anim {
/* translate to a position where the left edge of partial pre-rendered on */
/* the left edge of the viewport. */
to { transform: translateX(-50vw); }
}
#target {
width: 300vw;
height: 300vh;
transform: translateX(0vw);
}
</style>
<div style="transform: translateX(50vw);">
<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>
</div>
<script>
document.addEventListener("MozReftestInvalidate", () => {
target.style.animation = "anim 100s 1s step-start";
target.addEventListener("animationstart", () => {
// animtionstart event is fired just before requestAnimationFrame callbacks,
// so we need to wait two rAF to make sure the initial animation value is
// composited on the compositor.
requestAnimationFrame(() => {
requestAnimationFrame(() => {
document.documentElement.classList.remove("reftest-wait");
});
});
});
}, { once: true });
</script>
</html>
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