LayoutTests/editing/execCommand/forward-delete-read-write-canvas.html

<code style="color: green">PASS</code>
<canvas style="-webkit-user-modify: read-write"><span><input id="input"></input></span></canvas>
<script>
if (window.testRunner)
    testRunner.dumpAsText();
input.focus();
input.remove();
document.execCommand("ForwardDelete");
</script>