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chromium/third_party/blink/web_tests/external/wpt/html/semantics/interactive-elements/the-dialog-element/modal-dialog-scroll-height.html 

<!DOCTYPE html>
<link rel=author href="mailto:[email protected]">
<link rel=author href="mailto:[email protected]">
<link rel=help href="https://html.spec.whatwg.org/multipage/interactive-elements.html#the-dialog-element">
<link rel=help href="https://bugs.chromium.org/p/chromium/issues/detail?id=403136">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<style>
body {
  margin: 0;
}
.spacer {
  height: 500px;
}
dialog {
  border: 0;
  margin: 0;
  padding: 1px;
}
</style>
<div class="spacer"></div>
<dialog>
  <div class="spacer"></div>
</dialog>

<script>
test(() => {
  document.querySelector('dialog').showModal();
  assert_equals(document.scrollingElement.scrollHeight, window.innerHeight);
}, 'dialogs should be centered before computing overflow.');
</script>