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<p>
    This tests for regressions against <i><a href="http://bugzilla.opendarwin.org/show_bug.cgi?id=8420">http://bugzilla.opendarwin.org/show_bug.cgi?id=8420</a>
    iExploder(#12): Assertion failure in RenderContainer::removeChildNode</i>.
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<p>
    In the render tree, the button should have only one child, an anonymous block wrapping
    all of the button's other descendants.
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<button><span><div></div></span></button>
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