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chromium/third_party/blink/web_tests/external/wpt/css/css-images/object-view-box-iframe.html 

<!DOCTYPE html>
<html>
<title>CSS object-view-box on an iframe should be no-op</title>
<link rel="author" href="mailto:[email protected]">
<link rel="match" href="object-view-box-iframe-ref.html">
<link rel="help" href="https://drafts.csswg.org/css-images-4/#the-object-view-box">

<style>
.default {
  object-view-box: inset(50px 0px 0px 0px);
  object-fit: fill;
}
</style>
<iframe src="support/blue-green-red-yellow-50x100.svg"></iframe>