Option, checkbox and radio should support ':default' selector

third_party/WebKit/Source/core/html/HTMLInputElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLInputElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLInputElement.cpp b/third_party/WebKit/Source/core/html/HTMLInputElement.cpp
index 5b0c88c1637ab1d087f0011daee466c585d87bde..50c7fb0b756e083259fb66ab08ea66073696cb02 100644
--- a/third_party/WebKit/Source/core/html/HTMLInputElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLInputElement.cpp
@@ -1655,6 +1655,13 @@ bool HTMLInputElement::supportLabels() const
     return m_inputType->isInteractiveContent();
 }
 
+bool HTMLInputElement::isDefaultButtonForForm() const
+{
+    if (fastHasAttribute(checkedAttr))

[tkent, 2016/03/03 13:29:08]

The specification says "input elements to which the checked attribute applies"
but this code doesn't check it.  

Please add InputType::matchesDefaultPseudoClass(), then
 - HTMLInputElement::isDefaultButtonForForm() just calls
m_inputType->matchesDefaultPseudoClass().
 - BaseCheckableInputType::matchesDefaultPseudoClass() checkes
fastHasAttribute(checkedAttr)
 - BaseButtonInputType::isDefaultButtonForForm() checks
|isSuccessfulSubmitButton() && element().form() &&
element().form()->defaultButton() == &element()| (copy the logic of
HTMLFormControlElement::isDefaultButtonForForm)
 - Copy HTMLFormControlElement::isDefaultButtonForForm to
HTMLButtonElement::isDefaultButtonForForm
 - Remove HTMLFormControlElement::isDefaultButtonForForm

[ramya.v, 2016/03/04 06:31:45]

Done.

+        return true;
+    return HTMLFormControlElement::isDefaultButtonForForm();
+}
+
 bool HTMLInputElement::shouldAppearChecked() const
 {
     return checked() && m_inputType->isCheckable();