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<!doctype HTML>
<html>
<meta charset="utf8">
<title>Content Visibility: ContentVisibilityAutoStateChange event.</title>
<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
<meta name="assert" content="ContentVisibilityAutoStateChange fires once when element is inserted">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
.spacer {
height: 10000px;
}
</style>
<div id=topdiv></div>
<div class=spacer></div>
<div id=bottomdiv></div>
<script>
promise_test(t => new Promise(async (resolve, reject) => {
await new Promise((waited, _) => {
requestAnimationFrame(() => requestAnimationFrame(waited));
});
let observed = false;
let div = document.createElement("div");
div.addEventListener("contentvisibilityautostatechange", (e) => {
if (observed)
reject("already observed");
if (e.skipped)
reject("unexpected skipped");
observed = true;
// Wait a couple of frames to ensure no other signal comes in
requestAnimationFrame(() => requestAnimationFrame(resolve));
});
div.style.contentVisibility = "auto";
topdiv.appendChild(div);
}), "ContentVisibilityAutoStateChange fires once when added (not skipped)");
promise_test(t => new Promise(async (resolve, reject) => {
await new Promise((waited, _) => {
requestAnimationFrame(() => requestAnimationFrame(waited));
});
let observed = false;
let div = document.createElement("div");
div.addEventListener("contentvisibilityautostatechange", (e) => {
if (observed)
reject("already observed");
if (!e.skipped)
reject("unexpected not skipped");
observed = true;
// Wait a couple of frames to ensure no other signal comes in
requestAnimationFrame(() => requestAnimationFrame(resolve));
});
div.style.contentVisibility = "auto";
bottomdiv.appendChild(div);
}), "ContentVisibilityAutoStateChange fires once when added (skipped)");
</script>
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