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<div id="msg">
<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/208616">208616</a></dd>
<dt>Author</dt> <dd>antti@apple.com</dd>
<dt>Date</dt> <dd>2016-11-11 15:08:34 -0800 (Fri, 11 Nov 2016)</dd>
</dl>

<h3>Log Message</h3>
<pre>Updating class name doesn't update the slotted content's style
https://bugs.webkit.org/show_bug.cgi?id=164577
&lt;rdar://problem/29205873&gt;

Reviewed by Ryosuke Niwa.

Source/WebCore:

Test: fast/shadow-dom/css-scoping-slotted-invalidation.html

Teach style invalidation code for attribute/class/id mutations about slotted rules.

* dom/ShadowRoot.cpp:
(WebCore::assignedShadowRootsIfSlotted):

    Helper to find all assigned shadow roots (there may be more than one if slots are assigned to slots).

* dom/ShadowRoot.h:
* style/AttributeChangeInvalidation.cpp:
(WebCore::Style::mayBeAffectedByAttributeChange):
(WebCore::Style::mayBeAffectedByHostRules):
(WebCore::Style::mayBeAffectedBySlottedRules):
(WebCore::Style::AttributeChangeInvalidation::invalidateStyle):
(WebCore::Style::mayBeAffectedByHostStyle): Deleted.
* style/ClassChangeInvalidation.cpp:
(WebCore::Style::mayBeAffectedByHostRules):
(WebCore::Style::mayBeAffectedBySlottedRules):
(WebCore::Style::ClassChangeInvalidation::invalidateStyle):
(WebCore::Style::mayBeAffectedByHostStyle): Deleted.
* style/ClassChangeInvalidation.h:
* style/IdChangeInvalidation.cpp:
(WebCore::Style::mayBeAffectedByHostRules):
(WebCore::Style::mayBeAffectedBySlottedRules):
(WebCore::Style::IdChangeInvalidation::invalidateStyle):
(WebCore::Style::mayBeAffectedByHostStyle): Deleted.
* style/StyleSharingResolver.cpp:
(WebCore::Style::SharingResolver::canShareStyleWithElement):

    Fix a bug in style sharing where we were checking wrong element for host rules.
    Tested by the included test too (the last empty div).

LayoutTests:

* fast/shadow-dom/css-scoping-slotted-invalidation-expected.html: Added.
* fast/shadow-dom/css-scoping-slotted-invalidation.html: Added.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsChangeLog">trunk/LayoutTests/ChangeLog</a></li>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCoredomShadowRootcpp">trunk/Source/WebCore/dom/ShadowRoot.cpp</a></li>
<li><a href="#trunkSourceWebCoredomShadowRooth">trunk/Source/WebCore/dom/ShadowRoot.h</a></li>
<li><a href="#trunkSourceWebCorestyleAttributeChangeInvalidationcpp">trunk/Source/WebCore/style/AttributeChangeInvalidation.cpp</a></li>
<li><a href="#trunkSourceWebCorestyleClassChangeInvalidationcpp">trunk/Source/WebCore/style/ClassChangeInvalidation.cpp</a></li>
<li><a href="#trunkSourceWebCorestyleClassChangeInvalidationh">trunk/Source/WebCore/style/ClassChangeInvalidation.h</a></li>
<li><a href="#trunkSourceWebCorestyleIdChangeInvalidationcpp">trunk/Source/WebCore/style/IdChangeInvalidation.cpp</a></li>
<li><a href="#trunkSourceWebCorestyleStyleSharingResolvercpp">trunk/Source/WebCore/style/StyleSharingResolver.cpp</a></li>
</ul>

<h3>Added Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsfastshadowdomcssscopingslottedinvalidationexpectedhtml">trunk/LayoutTests/fast/shadow-dom/css-scoping-slotted-invalidation-expected.html</a></li>
<li><a href="#trunkLayoutTestsfastshadowdomcssscopingslottedinvalidationhtml">trunk/LayoutTests/fast/shadow-dom/css-scoping-slotted-invalidation.html</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/ChangeLog (208615 => 208616)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/ChangeLog        2016-11-11 23:04:55 UTC (rev 208615)
+++ trunk/LayoutTests/ChangeLog        2016-11-11 23:08:34 UTC (rev 208616)
</span><span class="lines">@@ -1,3 +1,14 @@
</span><ins>+2016-11-11  Antti Koivisto  &lt;antti@apple.com&gt;
+
+        Updating class name doesn't update the slotted content's style
+        https://bugs.webkit.org/show_bug.cgi?id=164577
+        &lt;rdar://problem/29205873&gt;
+
+        Reviewed by Ryosuke Niwa.
+
+        * fast/shadow-dom/css-scoping-slotted-invalidation-expected.html: Added.
+        * fast/shadow-dom/css-scoping-slotted-invalidation.html: Added.
+
</ins><span class="cx"> 2016-11-11  Chris Dumez  &lt;cdumez@apple.com&gt;
</span><span class="cx"> 
</span><span class="cx">         WorkerGlobalScope's indexedDB property should be on the prototype, not the instance
</span></span></pre></div>
<a id="trunkLayoutTestsfastshadowdomcssscopingslottedinvalidationexpectedhtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/shadow-dom/css-scoping-slotted-invalidation-expected.html (0 => 208616)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/shadow-dom/css-scoping-slotted-invalidation-expected.html                                (rev 0)
+++ trunk/LayoutTests/fast/shadow-dom/css-scoping-slotted-invalidation-expected.html        2016-11-11 23:08:34 UTC (rev 208616)
</span><span class="lines">@@ -0,0 +1,7 @@
</span><ins>+&lt;!DOCTYPE html&gt;
+&lt;html&gt;
+    &lt;body&gt;
+        &lt;p&gt;Test passes if you see a single 100px by 100px green box below.&lt;/p&gt;
+        &lt;div style=&quot;width: 100px; height: 100px; background: green;&quot;&gt;&lt;/div&gt;
+    &lt;/body&gt;
+&lt;/html&gt;
</ins></span></pre></div>
<a id="trunkLayoutTestsfastshadowdomcssscopingslottedinvalidationhtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/shadow-dom/css-scoping-slotted-invalidation.html (0 => 208616)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/shadow-dom/css-scoping-slotted-invalidation.html                                (rev 0)
+++ trunk/LayoutTests/fast/shadow-dom/css-scoping-slotted-invalidation.html        2016-11-11 23:08:34 UTC (rev 208616)
</span><span class="lines">@@ -0,0 +1,89 @@
</span><ins>+&lt;!DOCTYPE html&gt;
+&lt;body&gt;
+&lt;p&gt;Test passes if you see a single 100px by 100px green box below.&lt;/p&gt;
+&lt;div id=&quot;t1&quot;&gt;
+    &lt;span&gt;FAIL&lt;/span&gt;
+&lt;/div&gt;
+&lt;div id=&quot;t2&quot;&gt;
+    &lt;span slot=&quot;second-slot&quot;&gt;FAIL&lt;/span&gt;
+&lt;/div&gt;
+&lt;div id=&quot;t3&quot;&gt;
+    &lt;span&gt;FAIL&lt;/span&gt;
+&lt;/div&gt;
+&lt;div id=&quot;t4&quot;&gt;
+    &lt;span&gt;FAIL&lt;/span&gt;
+&lt;/div&gt;
+&lt;div id=&quot;t5&quot;&gt;
+    &lt;span selected&gt;FAIL&lt;/span&gt;
+&lt;/div&gt;
+&lt;div&gt;
+&lt;/div&gt;
+&lt;script&gt;
+
+function attachShadow(host, selector)
+{
+    const shadow = host.attachShadow({mode: 'closed'});
+    shadow.innerHTML = `
+    &lt;style&gt;
+    :host {
+        width: 100px;
+        height: 20px;
+        background: green;
+        color: red;
+    }
+    ${selector} {
+        color: green;
+    }
+    &lt;/style&gt;
+    &lt;slot&gt;&lt;/slot&gt;
+    &lt;slot name=&quot;second-slot&quot;&gt;&lt;/slot&gt;`;
+    return shadow;
+}
+
+{
+    const host = document.querySelector('#t1');
+    attachShadow(host, '::slotted(.selected)');
+    const span = host.querySelector('span');
+    getComputedStyle(span).backgroundColor;
+    span.className = 'selected';
+}
+
+{
+    const host = document.querySelector('#t2');
+    attachShadow(host, '[name=second-slot]::slotted(#selected)');
+    const span = host.querySelector('span');
+    getComputedStyle(span).backgroundColor
+    span.id = 'selected';
+}
+
+{
+    const host = document.querySelector('#t3');
+    attachShadow(host, '::slotted([selected])');
+    const span = host.querySelector('span');
+    getComputedStyle(span).backgroundColor;
+    span.setAttribute('selected', 'selected');
+}
+
+{
+    const host = document.querySelector('#t4');
+    const shadow = host.attachShadow({mode: 'closed'});
+    shadow.innerHTML = `&lt;div&gt;&lt;slot&gt;&lt;/slot&gt;&lt;/div&gt;`;
+    const deepHost = shadow.querySelector('div');
+    attachShadow(deepHost, '::slotted(.selected)');
+    const span = host.querySelector('span');
+    getComputedStyle(span).backgroundColor;
+    span.className = 'selected';
+}
+
+{
+    const host = document.querySelector('#t5');
+    const shadow = host.attachShadow({mode: 'closed'});
+    shadow.innerHTML = `&lt;div&gt;&lt;slot slot=&quot;second-slot&quot;&gt;&lt;/slot&gt;&lt;/div&gt;`;
+    const deepHost = shadow.querySelector('div');
+    attachShadow(deepHost, '[name=second-slot]::slotted(:not([selected]))');
+    const span = host.querySelector('span');
+    getComputedStyle(span).backgroundColor;
+    span.removeAttribute('selected');
+}
+
+&lt;/script&gt;
</ins></span></pre></div>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (208615 => 208616)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog        2016-11-11 23:04:55 UTC (rev 208615)
+++ trunk/Source/WebCore/ChangeLog        2016-11-11 23:08:34 UTC (rev 208616)
</span><span class="lines">@@ -1,3 +1,44 @@
</span><ins>+2016-11-11  Antti Koivisto  &lt;antti@apple.com&gt;
+
+        Updating class name doesn't update the slotted content's style
+        https://bugs.webkit.org/show_bug.cgi?id=164577
+        &lt;rdar://problem/29205873&gt;
+
+        Reviewed by Ryosuke Niwa.
+
+        Test: fast/shadow-dom/css-scoping-slotted-invalidation.html
+
+        Teach style invalidation code for attribute/class/id mutations about slotted rules.
+
+        * dom/ShadowRoot.cpp:
+        (WebCore::assignedShadowRootsIfSlotted):
+
+            Helper to find all assigned shadow roots (there may be more than one if slots are assigned to slots).
+
+        * dom/ShadowRoot.h:
+        * style/AttributeChangeInvalidation.cpp:
+        (WebCore::Style::mayBeAffectedByAttributeChange):
+        (WebCore::Style::mayBeAffectedByHostRules):
+        (WebCore::Style::mayBeAffectedBySlottedRules):
+        (WebCore::Style::AttributeChangeInvalidation::invalidateStyle):
+        (WebCore::Style::mayBeAffectedByHostStyle): Deleted.
+        * style/ClassChangeInvalidation.cpp:
+        (WebCore::Style::mayBeAffectedByHostRules):
+        (WebCore::Style::mayBeAffectedBySlottedRules):
+        (WebCore::Style::ClassChangeInvalidation::invalidateStyle):
+        (WebCore::Style::mayBeAffectedByHostStyle): Deleted.
+        * style/ClassChangeInvalidation.h:
+        * style/IdChangeInvalidation.cpp:
+        (WebCore::Style::mayBeAffectedByHostRules):
+        (WebCore::Style::mayBeAffectedBySlottedRules):
+        (WebCore::Style::IdChangeInvalidation::invalidateStyle):
+        (WebCore::Style::mayBeAffectedByHostStyle): Deleted.
+        * style/StyleSharingResolver.cpp:
+        (WebCore::Style::SharingResolver::canShareStyleWithElement):
+
+            Fix a bug in style sharing where we were checking wrong element for host rules.
+            Tested by the included test too (the last empty div).
+
</ins><span class="cx"> 2016-11-11  Dave Hyatt  &lt;hyatt@apple.com&gt;
</span><span class="cx"> 
</span><span class="cx">         [CSS Parser] Support the spring animation timing function
</span></span></pre></div>
<a id="trunkSourceWebCoredomShadowRootcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/dom/ShadowRoot.cpp (208615 => 208616)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/dom/ShadowRoot.cpp        2016-11-11 23:04:55 UTC (rev 208615)
+++ trunk/Source/WebCore/dom/ShadowRoot.cpp        2016-11-11 23:08:34 UTC (rev 208616)
</span><span class="lines">@@ -31,6 +31,7 @@
</span><span class="cx"> #include &quot;CSSStyleSheet.h&quot;
</span><span class="cx"> #include &quot;ElementTraversal.h&quot;
</span><span class="cx"> #include &quot;ExceptionCode.h&quot;
</span><ins>+#include &quot;HTMLSlotElement.h&quot;
</ins><span class="cx"> #include &quot;RenderElement.h&quot;
</span><span class="cx"> #include &quot;RuntimeEnabledFeatures.h&quot;
</span><span class="cx"> #include &quot;SlotAssignment.h&quot;
</span><span class="lines">@@ -183,5 +184,14 @@
</span><span class="cx">     return m_slotAssignment-&gt;assignedNodesForSlot(slot, *this);
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+Vector&lt;ShadowRoot*&gt; assignedShadowRootsIfSlotted(const Node&amp; node)
+{
+    Vector&lt;ShadowRoot*&gt; result;
+    for (auto* slot = node.assignedSlot(); slot; slot = slot-&gt;assignedSlot()) {
+        ASSERT(slot-&gt;containingShadowRoot());
+        result.append(slot-&gt;containingShadowRoot());
+    }
+    return result;
+}
</ins><span class="cx"> 
</span><span class="cx"> }
</span></span></pre></div>
<a id="trunkSourceWebCoredomShadowRooth"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/dom/ShadowRoot.h (208615 => 208616)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/dom/ShadowRoot.h        2016-11-11 23:04:55 UTC (rev 208615)
+++ trunk/Source/WebCore/dom/ShadowRoot.h        2016-11-11 23:08:34 UTC (rev 208616)
</span><span class="lines">@@ -133,6 +133,8 @@
</span><span class="cx">     return node.parentNode() &amp;&amp; node.parentNode()-&gt;isShadowRoot();
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+Vector&lt;ShadowRoot*&gt; assignedShadowRootsIfSlotted(const Node&amp;);
+
</ins><span class="cx"> } // namespace WebCore
</span><span class="cx"> 
</span><span class="cx"> SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::ShadowRoot)
</span></span></pre></div>
<a id="trunkSourceWebCorestyleAttributeChangeInvalidationcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/style/AttributeChangeInvalidation.cpp (208615 => 208616)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/style/AttributeChangeInvalidation.cpp        2016-11-11 23:04:55 UTC (rev 208615)
+++ trunk/Source/WebCore/style/AttributeChangeInvalidation.cpp        2016-11-11 23:08:34 UTC (rev 208616)
</span><span class="lines">@@ -36,16 +36,36 @@
</span><span class="cx"> namespace WebCore {
</span><span class="cx"> namespace Style {
</span><span class="cx"> 
</span><del>-static bool mayBeAffectedByHostStyle(ShadowRoot&amp; shadowRoot, bool isHTML, const QualifiedName&amp; attributeName)
</del><ins>+static bool mayBeAffectedByAttributeChange(DocumentRuleSets&amp; ruleSets, bool isHTML, const QualifiedName&amp; attributeName)
</ins><span class="cx"> {
</span><del>-    auto&amp; shadowRuleSets = shadowRoot.styleScope().resolver().ruleSets();
</del><ins>+    auto&amp; nameSet = isHTML ? ruleSets.features().attributeCanonicalLocalNamesInRules : ruleSets.features().attributeLocalNamesInRules;
+    return nameSet.contains(attributeName.localName().impl());
+}
+
+static bool mayBeAffectedByHostRules(const Element&amp; element, const QualifiedName&amp; attributeName)
+{
+    auto* shadowRoot = element.shadowRoot();
+    if (!shadowRoot)
+        return false;
+    auto&amp; shadowRuleSets = shadowRoot-&gt;styleScope().resolver().ruleSets();
</ins><span class="cx">     if (shadowRuleSets.authorStyle().hostPseudoClassRules().isEmpty())
</span><span class="cx">         return false;
</span><span class="cx"> 
</span><del>-    auto&amp; nameSet = isHTML ? shadowRuleSets.features().attributeCanonicalLocalNamesInRules : shadowRuleSets.features().attributeLocalNamesInRules;
-    return nameSet.contains(attributeName.localName().impl());
</del><ins>+    return mayBeAffectedByAttributeChange(shadowRuleSets, element.isHTMLElement(), attributeName);
</ins><span class="cx"> }
</span><span class="cx"> 
</span><ins>+static bool mayBeAffectedBySlottedRules(const Element&amp; element, const QualifiedName&amp; attributeName)
+{
+    for (auto* shadowRoot : assignedShadowRootsIfSlotted(element)) {
+        auto&amp; ruleSets = shadowRoot-&gt;styleScope().resolver().ruleSets();
+        if (ruleSets.authorStyle().slottedPseudoElementRules().isEmpty())
+            continue;
+        if (mayBeAffectedByAttributeChange(ruleSets, element.isHTMLElement(), attributeName))
+            return true;
+    }
+    return false;
+}
+
</ins><span class="cx"> void AttributeChangeInvalidation::invalidateStyle(const QualifiedName&amp; attributeName, const AtomicString&amp; oldValue, const AtomicString&amp; newValue)
</span><span class="cx"> {
</span><span class="cx">     if (newValue == oldValue)
</span><span class="lines">@@ -54,13 +74,10 @@
</span><span class="cx">     auto&amp; ruleSets = m_element.styleResolver().ruleSets();
</span><span class="cx">     bool isHTML = m_element.isHTMLElement();
</span><span class="cx"> 
</span><del>-    auto&amp; nameSet = isHTML ? ruleSets.features().attributeCanonicalLocalNamesInRules : ruleSets.features().attributeLocalNamesInRules;
-    bool mayAffectStyle = nameSet.contains(attributeName.localName().impl());
</del><ins>+    bool mayAffectStyle = mayBeAffectedByAttributeChange(ruleSets, isHTML, attributeName)
+        || mayBeAffectedByHostRules(m_element, attributeName)
+        || mayBeAffectedBySlottedRules(m_element, attributeName);
</ins><span class="cx"> 
</span><del>-    auto* shadowRoot = m_element.shadowRoot();
-    if (!mayAffectStyle &amp;&amp; shadowRoot &amp;&amp; mayBeAffectedByHostStyle(*shadowRoot, isHTML, attributeName))
-        mayAffectStyle = true;
-
</del><span class="cx">     if (!mayAffectStyle)
</span><span class="cx">         return;
</span><span class="cx"> 
</span></span></pre></div>
<a id="trunkSourceWebCorestyleClassChangeInvalidationcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/style/ClassChangeInvalidation.cpp (208615 => 208616)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/style/ClassChangeInvalidation.cpp        2016-11-11 23:04:55 UTC (rev 208615)
+++ trunk/Source/WebCore/style/ClassChangeInvalidation.cpp        2016-11-11 23:08:34 UTC (rev 208616)
</span><span class="lines">@@ -86,14 +86,28 @@
</span><span class="cx">     return changedClasses;
</span><span class="cx"> }
</span><span class="cx"> 
</span><del>-static bool mayBeAffectedByHostStyle(ShadowRoot&amp; shadowRoot, AtomicStringImpl* changedClass)
</del><ins>+static bool mayBeAffectedByHostRules(ShadowRoot* shadowRoot, AtomicStringImpl* changedClass)
</ins><span class="cx"> {
</span><del>-    auto&amp; shadowRuleSets = shadowRoot.styleScope().resolver().ruleSets();
</del><ins>+    if (!shadowRoot)
+        return false;
+    auto&amp; shadowRuleSets = shadowRoot-&gt;styleScope().resolver().ruleSets();
</ins><span class="cx">     if (shadowRuleSets.authorStyle().hostPseudoClassRules().isEmpty())
</span><span class="cx">         return false;
</span><span class="cx">     return shadowRuleSets.features().classesInRules.contains(changedClass);
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+static bool mayBeAffectedBySlottedRules(const Vector&lt;ShadowRoot*&gt;&amp; assignedShadowRoots, AtomicStringImpl* changedClass)
+{
+    for (auto&amp; assignedShadowRoot : assignedShadowRoots) {
+        auto&amp; ruleSets = assignedShadowRoot-&gt;styleScope().resolver().ruleSets();
+        if (ruleSets.authorStyle().slottedPseudoElementRules().isEmpty())
+            continue;
+        if (ruleSets.features().classesInRules.contains(changedClass))
+            return true;
+    }
+    return false;
+}
+
</ins><span class="cx"> void ClassChangeInvalidation::invalidateStyle(const SpaceSplitString&amp; oldClasses, const SpaceSplitString&amp; newClasses)
</span><span class="cx"> {
</span><span class="cx">     auto changedClasses = computeClassChange(oldClasses, newClasses);
</span><span class="lines">@@ -100,14 +114,13 @@
</span><span class="cx"> 
</span><span class="cx">     auto&amp; ruleSets = m_element.styleResolver().ruleSets();
</span><span class="cx">     auto* shadowRoot = m_element.shadowRoot();
</span><ins>+    auto assignedShadowRoots = assignedShadowRootsIfSlotted(m_element);
</ins><span class="cx"> 
</span><span class="cx">     ClassChangeVector changedClassesAffectingStyle;
</span><span class="cx">     for (auto* changedClass : changedClasses) {
</span><del>-        bool mayAffectStyle = ruleSets.features().classesInRules.contains(changedClass);
-
-        if (!mayAffectStyle &amp;&amp; shadowRoot &amp;&amp; mayBeAffectedByHostStyle(*shadowRoot, changedClass))
-            mayAffectStyle = true;
-
</del><ins>+        bool mayAffectStyle = ruleSets.features().classesInRules.contains(changedClass)
+            || mayBeAffectedByHostRules(shadowRoot, changedClass)
+            || mayBeAffectedBySlottedRules(assignedShadowRoots, changedClass);
</ins><span class="cx">         if (mayAffectStyle)
</span><span class="cx">             changedClassesAffectingStyle.append(changedClass);
</span><span class="cx">     };
</span></span></pre></div>
<a id="trunkSourceWebCorestyleClassChangeInvalidationh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/style/ClassChangeInvalidation.h (208615 => 208616)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/style/ClassChangeInvalidation.h        2016-11-11 23:04:55 UTC (rev 208615)
+++ trunk/Source/WebCore/style/ClassChangeInvalidation.h        2016-11-11 23:08:34 UTC (rev 208616)
</span><span class="lines">@@ -69,7 +69,7 @@
</span><span class="cx">         return;
</span><span class="cx">     invalidateDescendantStyle();
</span><span class="cx"> }
</span><del>-    
</del><ins>+
</ins><span class="cx"> }
</span><span class="cx"> }
</span><span class="cx"> 
</span></span></pre></div>
<a id="trunkSourceWebCorestyleIdChangeInvalidationcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/style/IdChangeInvalidation.cpp (208615 => 208616)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/style/IdChangeInvalidation.cpp        2016-11-11 23:04:55 UTC (rev 208615)
+++ trunk/Source/WebCore/style/IdChangeInvalidation.cpp        2016-11-11 23:08:34 UTC (rev 208616)
</span><span class="lines">@@ -35,15 +35,29 @@
</span><span class="cx"> namespace WebCore {
</span><span class="cx"> namespace Style {
</span><span class="cx"> 
</span><del>-static bool mayBeAffectedByHostStyle(ShadowRoot&amp; shadowRoot, const AtomicString&amp; changedId)
</del><ins>+static bool mayBeAffectedByHostRules(const Element&amp; element, const AtomicString&amp; changedId)
</ins><span class="cx"> {
</span><del>-    auto&amp; shadowRuleSets = shadowRoot.styleScope().resolver().ruleSets();
</del><ins>+    auto* shadowRoot = element.shadowRoot();
+    if (!shadowRoot)
+        return false;
+    auto&amp; shadowRuleSets = shadowRoot-&gt;styleScope().resolver().ruleSets();
</ins><span class="cx">     if (shadowRuleSets.authorStyle().hostPseudoClassRules().isEmpty())
</span><span class="cx">         return false;
</span><del>-
</del><span class="cx">     return shadowRuleSets.features().idsInRules.contains(changedId.impl());
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+static bool mayBeAffectedBySlottedRules(const Element&amp; element, const AtomicString&amp; changedId)
+{
+    for (auto* shadowRoot : assignedShadowRootsIfSlotted(element)) {
+        auto&amp; ruleSets = shadowRoot-&gt;styleScope().resolver().ruleSets();
+        if (ruleSets.authorStyle().slottedPseudoElementRules().isEmpty())
+            continue;
+        if (ruleSets.features().idsInRules.contains(changedId.impl()))
+            return true;
+    }
+    return false;
+}
+
</ins><span class="cx"> void IdChangeInvalidation::invalidateStyle(const AtomicString&amp; changedId)
</span><span class="cx"> {
</span><span class="cx">     if (changedId.isEmpty())
</span><span class="lines">@@ -51,12 +65,10 @@
</span><span class="cx"> 
</span><span class="cx">     auto&amp; ruleSets = m_element.styleResolver().ruleSets();
</span><span class="cx"> 
</span><del>-    bool mayAffectStyle = ruleSets.features().idsInRules.contains(changedId.impl());
</del><ins>+    bool mayAffectStyle = ruleSets.features().idsInRules.contains(changedId.impl())
+        || mayBeAffectedByHostRules(m_element, changedId)
+        || mayBeAffectedBySlottedRules(m_element, changedId);
</ins><span class="cx"> 
</span><del>-    auto* shadowRoot = m_element.shadowRoot();
-    if (!mayAffectStyle &amp;&amp; shadowRoot &amp;&amp; mayBeAffectedByHostStyle(*shadowRoot, changedId))
-        mayAffectStyle = true;
-
</del><span class="cx">     if (!mayAffectStyle)
</span><span class="cx">         return;
</span><span class="cx"> 
</span></span></pre></div>
<a id="trunkSourceWebCorestyleStyleSharingResolvercpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/style/StyleSharingResolver.cpp (208615 => 208616)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/style/StyleSharingResolver.cpp        2016-11-11 23:04:55 UTC (rev 208615)
+++ trunk/Source/WebCore/style/StyleSharingResolver.cpp        2016-11-11 23:08:34 UTC (rev 208616)
</span><span class="lines">@@ -288,7 +288,7 @@
</span><span class="cx">     if (candidateElement.matchesDefaultPseudoClass() != element.matchesDefaultPseudoClass())
</span><span class="cx">         return false;
</span><span class="cx"> 
</span><del>-    if (element.shadowRoot() &amp;&amp; !element.shadowRoot()-&gt;styleScope().resolver().ruleSets().authorStyle().hostPseudoClassRules().isEmpty())
</del><ins>+    if (candidateElement.shadowRoot() &amp;&amp; !candidateElement.shadowRoot()-&gt;styleScope().resolver().ruleSets().authorStyle().hostPseudoClassRules().isEmpty())
</ins><span class="cx">         return false;
</span><span class="cx"> 
</span><span class="cx"> #if ENABLE(FULLSCREEN_API)
</span></span></pre>
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