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chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/background-attachment-fixed-inline-scrolled.html 

<!DOCTYPE html>
<html class="reftest-wait">
<link rel="help" href="https://www.w3.org/TR/css-backgrounds-3/#background-attachment">
<link rel="match" href="background-attachment-fixed-inline-scrolled-ref.html">
<meta name="assert" content="Background with background-attachment-fixed on an inline element should be fixed to the viewport">
<style>
body {
  /* suppress scrollbars */
  overflow: hidden;
}
#target {
  background-attachment: fixed;
  background-image: linear-gradient(green 50%, yellow 50%);
  font-size: 130px;
  line-height: 100px;
}
</style>
<span id="target">
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</span>
<script>
requestAnimationFrame(() => {
  requestAnimationFrame(() => {
    scrollTo(0, 300);
    document.documentElement.classList.remove("reftest-wait");
  });
});
</script>