1 files changed, 12 insertions, 6 deletions
diff --git a/WebCore/html/HTMLOutputElement.cpp b/WebCore/html/HTMLOutputElement.cpp
index b83263e..2f1d490 100644
--- a/WebCore/html/HTMLOutputElement.cpp
+++ b/WebCore/html/HTMLOutputElement.cpp
@@ -40,7 +40,7 @@ inline HTMLOutputElement::HTMLOutputElement(const QualifiedName& tagName, Docume
     : HTMLFormControlElement(tagName, document, form)
     , m_isDefaultValueMode(true)
     , m_isSetTextContentInProgress(false)
-    , m_defaultValue()
+    , m_defaultValue("")
     , m_tokens(DOMSettableTokenList::create())
 {
 }
@@ -91,6 +91,8 @@ void HTMLOutputElement::reset()
     // value mode flag to "default" and then to set the element's textContent
     // attribute to the default value.
     m_isDefaultValueMode = true;
+    if (m_defaultValue == value())
+        return;
     setTextContentInternal(m_defaultValue);
 }
 
@@ -103,6 +105,8 @@ void HTMLOutputElement::setValue(const String& value)
 {
     // The value mode flag set to "value" when the value attribute is set.
     m_isDefaultValueMode = false;
+    if (value == this->value())
+        return;
     setTextContentInternal(value);
 }
 
@@ -113,11 +117,13 @@ String HTMLOutputElement::defaultValue() const
 
 void HTMLOutputElement::setDefaultValue(const String& value)
 {
-     m_defaultValue = value;
-     // The spec requires the value attribute set to the default value
-     // when the element's value mode flag to "default".
-     if (m_isDefaultValueMode)
-         setTextContentInternal(value);
+    if (m_defaultValue == value)
+        return;
+    m_defaultValue = value;
+    // The spec requires the value attribute set to the default value
+    // when the element's value mode flag to "default".
+    if (m_isDefaultValueMode)
+        setTextContentInternal(value);
 }
 
 void HTMLOutputElement::setTextContentInternal(const String& value)