HTML and markdown: treat textarea as a verbatim environment.

We don't want to parse its contents as Markdown or HTML.

Closes #5241.

src/Text/Pandoc/Readers/HTML.hs

@@ -412,7 +412,9 @@ pDiv = try $ do
 
 pRawHtmlBlock :: PandocMonad m => TagParser m Blocks
 pRawHtmlBlock = do
-  raw <- T.unpack <$> (pHtmlBlock "script" <|> pHtmlBlock "style" <|> pRawTag)
+  raw <- T.unpack <$>
+    (pHtmlBlock "script" <|> pHtmlBlock "style" <|> pHtmlBlock "textarea"
+      <|> pRawTag)
   exts <- getOption readerExtensions
   if extensionEnabled Ext_raw_html exts && not (null raw)
      then return $ B.rawBlock "html" raw

src/Text/Pandoc/Readers/Markdown.hs

@@ -1106,9 +1106,8 @@ htmlBlock :: PandocMonad m => MarkdownParser m (F Blocks)
 htmlBlock = do
   guardEnabled Ext_raw_html
   try (do
-      (TagOpen t attrs) <- lookAhead $ fst <$> htmlTag isBlockTag
-      (guard (t `elem` ["pre","style","script"]) >>
-          (return . B.rawBlock "html") <$> rawVerbatimBlock)
+      (TagOpen _ attrs) <- lookAhead $ fst <$> htmlTag isBlockTag
+      (return . B.rawBlock "html") <$> rawVerbatimBlock
         <|> (do guardEnabled Ext_markdown_attribute
                 oldMarkdownAttribute <- stateMarkdownAttribute <$> getState
                 markdownAttribute <-
@@ -1144,6 +1143,7 @@ rawVerbatimBlock = htmlInBalanced isVerbTag
   where isVerbTag (TagOpen "pre" _)      = True
         isVerbTag (TagOpen "style" _)    = True
         isVerbTag (TagOpen "script" _)   = True
+        isVerbTag (TagOpen "textarea" _) = True
         isVerbTag _                      = False
 
 rawTeXBlock :: PandocMonad m => MarkdownParser m (F Blocks)

test/command/5241.md

@@ -0,0 +1,12 @@
+```
+% pandoc -f markdown -t html5
+<textarea>
+ one
+  *two*
+</textarea>
+^D
+<textarea>
+ one
+  *two*
+</textarea>
+```