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<style>
body, html { margin: 0; }
</style>
<script>
window.addEventListener("message", event => {
if (event.data == "gotclick") {
// forward to parent
parent.postMessage("gotclick", "*");
}
});
</script>
<iframe style="border: 1px;" frameborder="1" src="http://example.org/tests/gfx/layers/apz/test/mochitest/helper_hittest_bug1715369_oopif.html"></iframe>
<div style="width:10px; height: 500vh;"></div>