descend-into-container-with-overflow.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-scroll-anchoring/descend-into-container-with-overflow.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

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

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

<style>

body { height: 4000px; }

#outer { width: 300px; }

#zeroheight { height: 0px; }

#changer { height: 100px; background-color: red; }

#bottom { margin-top: 600px; }

</style>

<div id="outer">

  <div id="zeroheight">

    <div id="changer"></div>

    <div id="bottom">bottom</div>

  </div>

</div>

<script>

// Tests that the anchor selection algorithm descends into zero-height

// containers that have overflowing content.

test(() => {

  document.scrollingElement.scrollTop = 200;

  document.querySelector("#changer").style.height = "200px";

  assert_equals(document.scrollingElement.scrollTop, 300);

}, "Zero-height container with visible overflow.");

</script>