Remove hidden elements from MHTML

third_party/WebKit/Source/web/tests/WebFrameSerializerTest.cpp

Index: third_party/WebKit/Source/web/tests/WebFrameSerializerTest.cpp
diff --git a/third_party/WebKit/Source/web/tests/WebFrameSerializerTest.cpp b/third_party/WebKit/Source/web/tests/WebFrameSerializerTest.cpp
index 60d6fa6f9932a389d2fd92cf06b175414fda8fe9..51a272c9085257a80fd3e6dcaeb6c7c2f30d4f7e 100644
--- a/third_party/WebKit/Source/web/tests/WebFrameSerializerTest.cpp
+++ b/third_party/WebKit/Source/web/tests/WebFrameSerializerTest.cpp
@@ -215,4 +215,17 @@ TEST_F(WebFrameSerializerSanitizationTest, RemoveInlineScriptInAttributes) {
   EXPECT_NE(std::string::npos, mhtml.find("id="));
 }
 
+TEST_F(WebFrameSerializerSanitizationTest, RemoveHiddenElements) {
+  String mhtml =
+      generateMHTMLParts("http://www.test.com", "hidden_elements.html");
+
+  // These hidden elements should be removed.
+  EXPECT_EQ(std::string::npos, mhtml.find("<p id=3D\"hidden_id\"")) << mhtml;
+  EXPECT_EQ(std::string::npos, mhtml.find("<input type=3D\"hidden\"")) << mhtml;
+
+  // These visible elements should remain intact.
+  EXPECT_NE(std::string::npos, mhtml.find("<p id=3D\"visible_id\"")) << mhtml;
+  EXPECT_NE(std::string::npos, mhtml.find("<input type=3D\"text\"")) << mhtml;
+}
+
 }  // namespace blink