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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/the-iframe-element/support/iframe-with-object.html 

<!doctype html>
<meta charset=utf-8>
<title>Display:none iframe with object tag</title>
<script>
  // If this document is loaded as a display:none iframe, forcing an update here
  // means we do not need a style or layout update after the object is inserted
  // below because we are not being rendered.
  document.documentElement.offsetTop;
</script>
<object data="data:text/html,frame"></object>