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chromium/third_party/blink/web_tests/external/wpt/css/css-contain/content-visibility/content-visibility-058-ref.html 

<!doctype HTML>
<html class="reftest-wait">
<meta charset="utf8">
<title>CSS Content Visibility: auto, scrollIntoView() (reference)</title>
<link rel="author" title="Vladimir Levin" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
<script src="/common/reftest-wait.js"></script>

<style>
.spacer {
  height: 10000px;
}
.container {
  position: relative;
  width: 150px;
  background: lightblue;
  contain-intrinsic-size: 50px 250px;
}
.size_contained {
  contain: size;
}
.child {
  width: 50px;
  height: 300px;
  background: lightgreen;
}
#target {
  position: absolute;
  bottom: 0;

  width: 10px;
  height: 10px;
  background: blue;
}
</style>

<p>Test FAILS if this sentence is at the top of the screen.
<div class=spacer></div>
<div id=container class="container">
  <div class=child></div>
  <div id=target></div>
</div>
<p>Test PASSES if this sentence is near the top of the screen, after a thin band of three colors.
<div class=spacer></div>

<script>

function runReference() {
  document.getElementById("target").scrollIntoView(true /* alignToTop */);
  requestAnimationFrame(takeScreenshot);
}

window.onload = requestAnimationFrame(() => {
  requestAnimationFrame(() => {
    requestAnimationFrame(() => {
      runReference();
    });
  });
});

</script>