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

<!DOCTYPE html>
<title>CSS Overflow Test: Root element's scrollbar-gutter is accounted for in fixed-pos positioning</title>
<link rel="author" title="Ting-Yu Lin" href="mailto:[email protected]">
<link rel="author" title="Mozilla" href="https://www.mozilla.org/">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=728807">
<link rel="match" href="scrollbar-gutter-fixedpos-001-ref.html">
<style>
:root {
  scrollbar-gutter: stable;
}
body {
  margin: 0;
}
.fixed {
  width: 100px;
  height: 100px;
  background: green;
  position: fixed;
}
</style>

<div class="fixed" style="left: 0"></div>
<div class="fixed" style="right: 0"></div>