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chromium/third_party/blink/web_tests/external/wpt/css/css-viewport/zoom/basic.html 

<!doctype html>
<meta charset="utf-8">
<title>zoom property: basic test</title>
<link rel="author" href="mailto:[email protected]" title="Emilio Cobos Álvarez">
<link rel="author" href="https://mozilla.com" title="Mozilla">
<link rel="help" href="https://drafts.csswg.org/css-viewport/#zoom-property">
<link rel="match" href="basic-ref.html">
<style>
div {
  width: 100px;
  height: 100px;
  background-color: green;
}
</style>
<div></div>
<div style="zoom: 2"></div>