Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/external/wpt/css/cssom/computed-style-002.html 

<!DOCTYPE html>
<title>CSS Test: getComputedStyle - resolved width in iframe</title>
<link rel="author" title="Rune Lillesveen" href="mailto:[email protected]" />
<link rel="help" href="https://drafts.csswg.org/cssom/#resolved-values" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe id="frm" width="100"></iframe>
<script>
  test(() => {
    const frmDoc = frm.contentWindow.document;
    frmDoc.open();
    frmDoc.write('<body style="margin:0"><div style="width:100%"></div>');
    frmDoc.close();

    assert_equals(frm.contentWindow.getComputedStyle(frmDoc.querySelector("div")).width, "100px");
  }, "Check that a percent width in an iframe is resolved against iframe width for getComputedStyle.");
</script>