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chromium/third_party/blink/web_tests/external/wpt/css/css-overflow/scrollbar-gutter-abspos-001.html 

<!doctype html>
<title>CSS Overflow Test: scrollbar-gutter is accounted for in abspos sizing</title>
<link rel="help" href="mailto:[email protected]" title="Emilio Cobos Álvarez">
<link rel="help" href="https://mozilla.org" title="Mozilla">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1756826">
<link rel="match" href="scrollbar-gutter-abspos-001-ref.html">
<style>
.container {
  scrollbar-gutter: stable;
  overflow-y: auto;
  width: 100px;
  height: 200px;
  position: relative;
}
.abspos {
  width: 100%;
  height: 100px;
  background: green;
  position: absolute;
  left: 0;
}
</style>
<div class="container">
  <div class="abspos"></div>
</div>