gecko-dev/layout/base/tests/chrome/bug551434_childframe.html

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HTML

<script>
var gKeyDownChild = 0, gKeyPressChild = 0, gKeyUpChild = 0;
</script>
<input id='i4' onkeydown="gKeyDownChild++" onkeypress="gKeyPressChild++" onkeyup="gKeyUpChild++; this.parentNode.removeChild(this);">