Improve default value handling for SVGSVGElement.width/height

third_party/WebKit/Source/core/svg/SVGSVGElement.cpp

Index: third_party/WebKit/Source/core/svg/SVGSVGElement.cpp
diff --git a/third_party/WebKit/Source/core/svg/SVGSVGElement.cpp b/third_party/WebKit/Source/core/svg/SVGSVGElement.cpp
index 02cf93023e5964c7648ed33075fa3e7c88e1c4aa..ae6b0e1f278582355a097b4ca14b1e7450665c9b 100644
--- a/third_party/WebKit/Source/core/svg/SVGSVGElement.cpp
+++ b/third_party/WebKit/Source/core/svg/SVGSVGElement.cpp
@@ -193,6 +193,14 @@ void SVGSVGElement::parseAttribute(const QualifiedName& name, const AtomicString
     } else if (name == HTMLNames::onerrorAttr) {
         document().setWindowAttributeEventListener(EventTypeNames::error, createAttributeEventListener(document().frame(), name, value, eventParameterName()));
     } else if (SVGZoomAndPan::parseAttribute(name, value)) {
+    } else if (name == SVGNames::widthAttr || name == SVGNames::heightAttr) {
+        SVGAnimatedLength* property = name == SVGNames::widthAttr ? m_width : m_height;
+        SVGParsingError parseError;
+        if (!value.isNull())
+            parseError = property->setBaseValueAsString(value);
+        if (parseError != SVGParseStatus::NoError || value.isNull())
+            property->setDefaultValueAsString("100%");
+        reportAttributeParsingError(parseError, name, value);
     } else {
         SVGElement::parseAttribute(name, oldValue, value);
     }