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layout: Add a query for getting the effective overflow of an element and use it in script #57481

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Merged
servo-wpt-sync merged 2 commits into from
Mar 5, 2026
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layout: Add a query for getting the effective overflow of an element and use it in script #57481

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e549371
Add IntersectionObserver WPT and minor tidy up
stevennovaryo Mar 5, 2026
a9d410c
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stevennovaryo Mar 5, 2026
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10 changes: 5 additions & 5 deletions intersection-observer/animating.html
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Original file line number Diff line number Diff line change
Expand Up @@ -18,8 +18,8 @@
}
@keyframes slideup {
0% { transform: translateY(0) }
30% { transform: translateY(0) }
31% { transform: translateY(-2000px) }
50% { transform: translateY(0) }
51% { transform: translateY(-2000px) }
100% { transform: translateY(-2000px) }
}
</style>
Expand All @@ -40,10 +40,10 @@
}
});
});
target.style.animation = "3s linear slideup";
target.style.animation = "4s linear slideup";
setTimeout(() => {
reject("Did not get a not-intersecting notification within 2 seconds.");
}, 2000);
reject("Did not get a not-intersecting notification within 3 seconds.");
}, 3000);
target.addEventListener("animationend", evt => {
reject("animationend event fired before not-intersecting notification.");
});
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73 changes: 73 additions & 0 deletions intersection-observer/root-is-table-with-overflow-scroll.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,73 @@
<!DOCTYPE html>
<title>IntersectionObserver observing table with border and overflow scroll</title>
<link rel="author" href="mailto:steven.novaryo@gmail.com" title="Steven Novaryo">
<link rel="help" href="https://w3c.github.io/IntersectionObserver/#intersectionobserver-root-intersection-rectangle">
<link rel="help" href="https://drafts.csswg.org/css-tables/#global-style-overrides">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="./resources/intersection-observer-test-utils.js"></script>

<style>
#root {
box-sizing: border-box;
overflow: scroll;
border: 50px solid black;
will-change: transform;
}
#target {
display: inline-block;
width: 50px;
height: 50px;
position: absolute;
top: 300px;
left: 300px;
background-color: green;
}
</style>
<table id="root">
<tr>
<td>
<span id="target"></span>
</td>
</tr>
</table>
<script>
var entries = [];
var rootRect = root.getBoundingClientRect();

runTestCycle(function() {
assert_true(!!target, "target exists");
var observer = new IntersectionObserver(function(changes) {
entries = entries.concat(changes)
}, { root: root });
observer.observe(target);
entries = entries.concat(observer.takeRecords());
assert_equals(entries.length, 0, "No initial notifications.");
runTestCycle(step0, "First rAF.");
}, "IntersectionObserver observing an element inside a root table.");

function step0() {
// To reduce the inconsistencies of the layout within different UAs we are calculating the offset dynamically.
var targetRect = target.getBoundingClientRect();
target.style.top = `${300 - (targetRect.top - rootRect.bottom + 50)}px`;
target.style.left = `${300 - (targetRect.left - rootRect.right + 50)}px`;
runTestCycle(step1, "Moving the target to the right bottom corner of the table.");
checkLastEntry(entries, 0, [
targetRect.left, targetRect.right, targetRect.top, targetRect.bottom,
0, 0, 0, 0,
rootRect.left, rootRect.right, rootRect.top, rootRect.bottom,
false
]);
}

function step1() {
var targetRect = target.getBoundingClientRect();
checkLastEntry(entries, 1, [
targetRect.left, targetRect.right, targetRect.top, targetRect.bottom,
targetRect.left, targetRect.right, targetRect.top, targetRect.bottom,
rootRect.left, rootRect.right, rootRect.top, rootRect.bottom,
true
]);
}

</script>