Display MathML fallback content when it is specified and take into account inline/display modes for…

Source/core/css/CSSDefaultStyleSheets.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 11 matching lines @@
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #include "config.h"
 #include "core/css/CSSDefaultStyleSheets.h"
 
+#include "MathMLNames.h"
 #include "UserAgentStyleSheets.h"
 #include "core/css/MediaQueryEvaluator.h"
 #include "core/css/RuleSet.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/dom/FullscreenElementStack.h"
 #include "core/html/HTMLAnchorElement.h"
 #include "core/html/HTMLHtmlElement.h"
 #include "core/rendering/RenderTheme.h"
 
 namespace WebCore {
@@ skipping 39 matching lines @@
     : m_defaultStyle(nullptr)
     , m_defaultViewportStyle(nullptr)
     , m_defaultQuirksStyle(nullptr)
     , m_defaultPrintStyle(nullptr)
     , m_defaultViewSourceStyle(nullptr)
     , m_defaultXHTMLMobileProfileStyle(nullptr)
     , m_defaultStyleSheet(nullptr)
     , m_viewportStyleSheet(nullptr)
     , m_quirksStyleSheet(nullptr)
     , m_svgStyleSheet(nullptr)
+    , m_mathmlStyleSheet(nullptr)
     , m_mediaControlsStyleSheet(nullptr)
     , m_fullscreenStyleSheet(nullptr)
 {
     m_defaultStyle = RuleSet::create();
     m_defaultViewportStyle = RuleSet::create();
     m_defaultPrintStyle = RuleSet::create();
     m_defaultQuirksStyle = RuleSet::create();
 
     // Strict-mode rules.
     String defaultRules = String(htmlUserAgentStyleSheet, sizeof(htmlUserAgentStyleSheet)) + RenderTheme::theme().extraDefaultStyleSheet();
@@ skipping 39 matching lines @@
 void CSSDefaultStyleSheets::ensureDefaultStyleSheetsForElement(Element* element, bool& changedDefaultStyle)
 {
     // FIXME: We should assert that the sheet only styles SVG elements.
     if (element->isSVGElement() && !m_svgStyleSheet) {
         m_svgStyleSheet = parseUASheet(svgUserAgentStyleSheet, sizeof(svgUserAgentStyleSheet));
         m_defaultStyle->addRulesFromSheet(svgStyleSheet(), screenEval());
         m_defaultPrintStyle->addRulesFromSheet(svgStyleSheet(), printEval());
         changedDefaultStyle = true;
     }
 
+    // FIXME: We should assert that the sheet only styles MathML elements.
+    if (element->namespaceURI() == MathMLNames::mathmlNamespaceURI
+        && !m_mathmlStyleSheet) {
+        m_mathmlStyleSheet = parseUASheet(mathmlUserAgentStyleSheet,
+            sizeof(mathmlUserAgentStyleSheet));
+        m_defaultStyle->addRulesFromSheet(mathmlStyleSheet(), screenEval());
+        m_defaultPrintStyle->addRulesFromSheet(mathmlStyleSheet(), printEval());
+        changedDefaultStyle = true;
+    }
+
     // FIXME: We should assert that this sheet only contains rules for <video> and <audio>.
     if (!m_mediaControlsStyleSheet && (isHTMLVideoElement(*element) || isHTMLAudioElement(*element))) {
         String mediaRules = String(mediaControlsUserAgentStyleSheet, sizeof(mediaControlsUserAgentStyleSheet)) + RenderTheme::theme().extraMediaControlsStyleSheet();
         m_mediaControlsStyleSheet = parseUASheet(mediaRules);
         m_defaultStyle->addRulesFromSheet(mediaControlsStyleSheet(), screenEval());
         m_defaultPrintStyle->addRulesFromSheet(mediaControlsStyleSheet(), printEval());
         changedDefaultStyle = true;
     }
 
     // FIXME: This only works because we Force recalc the entire document so the new sheet
@@ skipping 15 matching lines @@
     visitor->trace(m_defaultStyle);
     visitor->trace(m_defaultViewportStyle);
     visitor->trace(m_defaultQuirksStyle);
     visitor->trace(m_defaultPrintStyle);
     visitor->trace(m_defaultViewSourceStyle);
     visitor->trace(m_defaultXHTMLMobileProfileStyle);
     visitor->trace(m_defaultStyleSheet);
     visitor->trace(m_viewportStyleSheet);
     visitor->trace(m_quirksStyleSheet);
     visitor->trace(m_svgStyleSheet);
+    visitor->trace(m_mathmlStyleSheet);
     visitor->trace(m_mediaControlsStyleSheet);
     visitor->trace(m_fullscreenStyleSheet);
 }
 
 } // namespace WebCore