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content-visibility-auto-relevancy-updates.html
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<!doctype html>
<meta charset="utf-8">
<title>Content Visibility: relevancy updates</title>
<link rel="author" title="Frédéric Wang" href="mailto:fwang@igalia.com">
<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
<link rel="help" href="https://drafts.csswg.org/css-contain/#relevant-to-the-user">
<link rel="help" href="https://drafts.csswg.org/css-contain/#cv-notes">
<meta name="assert" content="Verify relevancy is properly updated for content-visibility: auto elements.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#spacer {
height: 300vh;
}
#contentVisibilityAuto {
content-visibility: auto;
border: solid;
}
</style>
<div>
<div id="log"></div>
<div tabindex="1" id="spacer"></div>
<div tabindex="2" id="contentVisibilityAuto">
<span>Hello, World!</span>
</div>
</div>
<script>
function tick() {
return new Promise(r => {
requestAnimationFrame(() => requestAnimationFrame(r));
});
}
function contentVisibilityAutoElementIsRelevant() {
// A content-visibility: auto element that is not relevant skips its contents,
// which do not contribute to the result of innerText.
return contentVisibilityAuto.innerText.length > 0;
}
function clearRelevancyReasons() {
window.scrollTo(0, 0);
spacer.focus({preventScroll: true});
window.getSelection().empty();
}
promise_test(async function(t) {
// Wait for page load.
await new Promise(resolve => { window.addEventListener("load", resolve); });
// Register cleanup method to reset relevancy.
t.add_cleanup(clearRelevancyReasons);
// Element should initially not be relevant.
await tick();
assert_false(contentVisibilityAutoElementIsRelevant(), "initial relevancy");
// Make element close to the viewport.
contentVisibilityAuto.firstElementChild.scrollIntoView();
await tick();
assert_true(contentVisibilityAutoElementIsRelevant(), "close to viewport");
// Scroll away from the element again.
window.scrollTo(0, 0);
await tick();
assert_false(contentVisibilityAutoElementIsRelevant(), "far from viewport");
}, "Relevancy updated after changing proximity to the viewport.");
promise_test(async function(t) {
// Register cleanup method to reset relevancy.
t.add_cleanup(clearRelevancyReasons);
// Element should initially not be relevant.
await tick();
assert_false(contentVisibilityAutoElementIsRelevant(), "initial relevancy");
// Focus the element.
contentVisibilityAuto.focus({preventScroll: true});
await tick();
assert_true(contentVisibilityAutoElementIsRelevant(), "focused");
// Unfocus the element again.
spacer.focus({preventScroll: true});
await tick();
assert_false(contentVisibilityAutoElementIsRelevant(), "unfocused");
}, "Relevancy updated after being focused/unfocused.");
promise_test(async function(t) {
// Register cleanup method to reset relevancy.
t.add_cleanup(clearRelevancyReasons);
// Element should initially not be relevant.
await tick();
assert_false(contentVisibilityAutoElementIsRelevant(), "initial relevancy");
// Select the contents of the element.
window.getSelection().selectAllChildren(contentVisibilityAuto);
await tick();
assert_true(contentVisibilityAutoElementIsRelevant(), "selected");
// Unselect the contents of the element.
window.getSelection().empty();
await tick();
assert_false(contentVisibilityAutoElementIsRelevant(), "unselected");
}, "Relevancy updated after being selected/unselected.");
</script>