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

third_party/WebKit/Source/core/css/SelectorChecker.cpp

Index: third_party/WebKit/Source/core/css/SelectorChecker.cpp
diff --git a/third_party/WebKit/Source/core/css/SelectorChecker.cpp b/third_party/WebKit/Source/core/css/SelectorChecker.cpp
index 2396d13e18564ae2a3f21645e43d69d9d792e84f..2a4dc1c5e378d0fdcec1fd9dddf087ada2bd062d 100644
--- a/third_party/WebKit/Source/core/css/SelectorChecker.cpp
+++ b/third_party/WebKit/Source/core/css/SelectorChecker.cpp
@@ -831,7 +831,16 @@ bool SelectorChecker::checkPseudoClass(const SelectorCheckingContext& context, M
     case CSSSelector::PseudoFullPageMedia:
         return element.document().isMediaDocument();
     case CSSSelector::PseudoDefault:
-        return element.isDefaultButtonForForm();
+        if (element.isDefaultButtonForForm())
+            return true;
+        if (isHTMLInputElement(element)) {

[tkent, 2016/03/03 06:46:02]

You shouldn't add code here.  You should override
HTMLOptionElement::isDefaultButtonForForm and
HTMLInputElement::isDefaultButtonForForm.

[ramya.v, 2016/03/03 10:29:19]

Done.

+            HTMLInputElement& inputElement = toHTMLInputElement(element);
+            if (inputElement.shouldAppearChecked() && !inputElement.shouldAppearIndeterminate())

[tkent, 2016/03/03 06:46:02]

The specification doesn't ask to check them.  It says "have a checked attribute"

[ramya.v, 2016/03/03 10:29:19]

Done.

+                return true;
+        } else if (isHTMLOptionElement(element) && toHTMLOptionElement(element).selected()) {

[tkent, 2016/03/03 06:46:02]

The specification doesn't ask to check |selected| IDL attribute.  It says "have
a selected attribute".

[ramya.v, 2016/03/03 10:29:19]

Done.

+            return true;
+        }
+        break;
     case CSSSelector::PseudoDisabled:
         // TODO(esprehn): Why not just always return isDisabledFormControl()?
         // Can it be true for elements not in the list below?