frameset-ok isn't affected by input type=hidden

--HG--
extra : transplant_source : %5DU%F6%98%A5r%26%A1%9B%8A%B6%B0%DF%0D%F0%87%D3%BF%03p

Author: James Graham

html5lib/html5parser.py

@@ -939,9 +939,10 @@ def __init__(self, parser, tree):
                 (("applet", "marquee", "object"), self.startTagAppletMarqueeObject),
                 ("xmp", self.startTagXmp),
                 ("table", self.startTagTable),
-                (("area", "br", "embed", "img", "input", "keygen", 
-                  "wbr"), self.startTagVoidFormatting),
+                (("area", "br", "embed", "img", "keygen", "wbr"),
+                 self.startTagVoidFormatting),
                 (("param", "source", "track"), self.startTagParamSource),
+                ("input", self.startTagInput),
                 ("hr", self.startTagHr),
                 ("image", self.startTagImage),
                 ("isindex", self.startTagIsIndex),
@@ -1198,6 +1199,14 @@ def startTagVoidFormatting(self, token):
             token["selfClosingAcknowledged"] = True
             self.parser.framesetOK = False
 
+        def startTagInput(self, token):
+            framesetOK = self.parser.framesetOK
+            self.startTagVoidFormatting(token)
+            if ("type" in token["data"] and
+                token["data"]["type"].translate(asciiUpper2Lower) == "hidden"):
+                #input type=hidden doesn't change framesetOK
+                self.parser.framesetOK = framesetOK
+
         def startTagParamSource(self, token):
             self.tree.insertElement(token)
             self.tree.openElements.pop()