chromium/content/test/data/accessibility/html/object-image.html

<!--
@AURALINUX-ALLOW:tag:*
@BLINK-ALLOW:htmlTag='slot'
@WAIT-FOR:complete
-->
<div>
    <object data="./greenbox.png"
            onload="document.getElementById('done').innerText='complete';">
        Fallback
    </object>
</div>
<div id="done"></div>