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    <body><span class="vcard"><a class="email" href="mailto:mcatanzaro&#64;igalia.com" title="Michael Catanzaro &lt;mcatanzaro&#64;igalia.com&gt;"> <span class="fn">Michael Catanzaro</span></a>
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              <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - Implement functional :host() pseudo class"
   href="https://bugs.webkit.org/show_bug.cgi?id=156397">bug 156397</a>
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            <th>What</th>
            <th>Removed</th>
            <th>Added</th>
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               &nbsp;
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           <td>mcatanzaro&#64;igalia.com
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            <b><a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - Implement functional :host() pseudo class"
   href="https://bugs.webkit.org/show_bug.cgi?id=156397#c8">Comment # 8</a>
              on <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - Implement functional :host() pseudo class"
   href="https://bugs.webkit.org/show_bug.cgi?id=156397">bug 156397</a>
              from <span class="vcard"><a class="email" href="mailto:mcatanzaro&#64;igalia.com" title="Michael Catanzaro &lt;mcatanzaro&#64;igalia.com&gt;"> <span class="fn">Michael Catanzaro</span></a>
</span></b>
        <pre>It broke debug builds without ENABLE_SHADOW_DOM:

../../Source/WebCore/css/SelectorChecker.cpp: In member function ‘bool WebCore::SelectorChecker::matchHostPseudoClass(const WebCore::CSSSelector&amp;, const WebCore::Element&amp;, WebCore::SelectorChecker::CheckingContext&amp;, unsigned int&amp;) const’:
../../Source/WebCore/css/SelectorChecker.cpp:206:94: error: ‘PseudoClassHost’ is not a member of ‘WebCore::CSSSelector’
     ASSERT(selector.match() == CSSSelector::PseudoClass &amp;&amp; selector.pseudoClassType() == CSSSelector::PseudoClassHost);
                                                                                              ^

It's not immediately clear to me how to fix this. Disabling that assert doesn't seem right.</pre>
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