Implement reportValidity()

LayoutTests/fast/forms/reportValidity-valid-expected.txt

Index: LayoutTests/fast/forms/reportValidity-valid-expected.txt
diff --git a/LayoutTests/fast/forms/reportValidity-valid-expected.txt b/LayoutTests/fast/forms/reportValidity-valid-expected.txt
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+This test checks if reportValidity() returns correctly a true (meaning no error) result.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+ lorem ipsum     
+
+Elements valid from the begining
+PASS document.getElementsByTagName("fieldset")[0].reportValidity() is true
+PASS document.getElementsByTagName("input")[0].reportValidity() is true
+PASS document.getElementsByTagName("button")[0].reportValidity() is true
+PASS document.getElementsByTagName("select")[0].reportValidity() is true
+PASS document.getElementsByTagName("textarea")[0].reportValidity() is true
+PASS document.getElementsByTagName("output")[0].reportValidity() is true
+PASS document.getElementsByTagName("object")[0].reportValidity() is true
+PASS document.getElementsByTagName("keygen")[0].reportValidity() is true
+PASS document.getElementById("happy_form")[0].reportValidity() is true
+
+Element valid when changed
+PASS form.reportValidity() is true
+
+PASS successfullyParsed is true
+
+TEST COMPLETE
+