iframe-display-block-to-display-none.html

<!DOCTYPE html>
<script src="resources/text-based-repaint.js"></script>
<script>
function repaintTest()
{
    document.getElementById("iframe").style.display = "none";
}
window.addEventListener("load", runRepaintAndPixelTest);
</script>
<p><a href="https://code.google.com/p/chromium/issues/detail?id=650433">issue 650433</a>:
    display:none iframes do not have layout objects<br>
    The test checks that changing the style of an iframe from block to none
    creates the right sequence of paint invalidations.
</p>
<iframe id="iframe" width="728" height="90" style="display: block"></iframe>

chromium/third_party/blink/web_tests/paint/invalidation/iframe-display-block-to-display-none.html