chromium/third_party/blink/renderer/core/testing/data/composited_selection_bounds_iframe.html

<style>
    @font-face {
        font-family: ahem;
        src: url(Ahem.ttf);
    }
    * {
        font-family: ahem;
    }
</style>
<iframe id="frame" src="composited_selection_bounds_basic.html"></iframe>
<script>
    document.getElementById("frame").focus();
    window.expectedResult = [document, 78, 18, 78, 30, document, 138, 30, 138, 42];
</script>