exclude-sticky.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-scroll-anchoring/exclude-sticky.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring-1/">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<style>

body { height: 400vh; margin: 0; }

#sticky, #content { width: 200px; height: 100px; }

#sticky { position: sticky; left: 100px; top: 50px; }

#before { height: 50px; }

#content { margin-top: 100px; }

</style>

<div id="sticky">sticky</div>

<div id="before"></div>

<div id="content">content</div>

<script>

// Tests that the anchor selection algorithm skips sticky-positioned elements.

test(() => {

  document.scrollingElement.scrollTop = 150;

  document.querySelector("#before").style.height = "100px";

  assert_equals(document.scrollingElement.scrollTop, 200);

}, "Sticky-positioned headers shouldn't be chosen as scroll anchors (we should use 'content' instead)");

</script>