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chromium/third_party/blink/web_tests/external/wpt/css/css-viewport/zoom/relative-units-from-parent.html 

<!doctype html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:[email protected]">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1892676">
<link rel="help" href="https://drafts.csswg.org/css-viewport/#zoom-property">
<link rel="match" href="relative-units-from-parent-ref.html">
<!--
  The font-size and line-height use the parent sizes, but should still
  multiply by our own zoom.
-->
<div style="zoom: 2; font-size: 2em; line-height: 2lh">ABC</div>