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<!DOCTYPE html>
<html><head><style>
i:before{content:"X"}
</style></head><body onload="runTest()"><div><button type="button"><i></i></button><p></p></div><editor contenteditable="true">focus me, then press the UP key</editor>
<script>
function runTest() {
document.body.offsetHeight;
var e = document.querySelector('editor');
e.focus()
}
</script>