Sandbox::https://github.com/web-platform-tests/wpt/blob/master/css/cssom/computed-style-002.html

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<!DOCTYPE html>

<title>CSS Test: getComputedStyle - resolved width in iframe</title>

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>