gecko-dev/layout/reftests/transform/partial-prerender-expansion...

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HTML

<!DOCTYPE html>
<html class="reftest-wait reftest-no-flush" reftest-resolution="0.5">
<meta name="viewport" content="width=device-width,minimum-scale=0.5,initial-scale=1">
<!--
A variant of partial-prerender-expansion-with-resolution-2.html, a partial
pre-rendered transform animation in an iframe with <1.0 resolution.
-->
<style>
html {
scrollbar-width: none;
}
body {
margin: 0px;
padding: 0px;
}
</style>
<iframe style="width:1600px; height:2000px; border: 0"
srcdoc="<!DOCTYPE HTML>
<html>
<style>
html {
scrollbar-width: none;
}
html, body {
margin: 0;
padding: 0;
}
@keyframes anim {
/* The reftest window size is (800x1000) and it's scaled by */
/* 0.5 (= 1600x2000), which means the partial pre-render */
/* size is (2250x2250) so move to a position inside the */
/* pre-render area and away from the pre-render right edge, */
/* translateX(-650px), so that we can avoid blurry edges in */
/* comparison with the reference. */
to { transform: translateX(-400px); }
}
#target {
width: 4000px;
height: 4000px;
position: absolute;
transform: translateX(0px);
}
</style>
<div id='target'>
<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 4000 4000'>
<rect fill='green' x='0' width='1600' height='4000'></rect>
<rect fill='blue' x='1600' width='650' height='4000'></rect>
<rect fill='red' x='2250' width='1750' height='4000'></rect>
</svg>
</div>
<script>
window.addEventListener('message', () => {
if (event.data == 'start') {
target.style.animation = 'anim 100s 1s step-start';
target.addEventListener('animationstart', () => {
parent.postMessage('animationstart', '*');
});
}
});
</script></html>">
</iframe>
<script>
document.addEventListener("MozReftestInvalidate", () => {
document.querySelector("iframe").contentWindow.postMessage("start", "*");
}, { once: true });
window.addEventListener("message", event => {
if (event.data == "animationstart") {
document.documentElement.classList.remove('reftest-wait');
}
});
</script>
</html>