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chromium/third_party/blink/web_tests/external/wpt/css/css-viewport/zoom/reference/iframe-zoom-ref.html 

<!DOCTYPE html>
<title>ref for iframe in an element with css zoom</title>
<link rel="author" title="Yotam Hacohen" href="mailto:[email protected]">
<link rel="author" title="Stefan Zager" href="mailto:[email protected]">
<link rel="author" title="Google" href="http://www.google.com/">
<link rel="help" href="https://drafts.csswg.org/css-viewport/">

<style>
body {
  --iframe-width: 128px;
  --iframe-height: 64px;
  --scale: 1;
}
iframe {
  border: none;
  width: calc(var(--iframe-width) * var(--scale));
  height: calc(var(--iframe-height) * var(--scale));
}
.scale {
  --scale: 2;
}
</style>

<iframe id="baseline-ref" src="../resources/leaf.html"></iframe>
<iframe id="zoom-same-origin-ref" class="scale" src="../resources/leaf.html?scale=2"></iframe>
<iframe id="zoom-cross-origin-ref" class="scale" src="../resources/leaf.html?scale=2"></iframe>