1 files changed, 3 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/vendor/html-scanner/html/tokenizer.rb b/actionpack/lib/action_controller/vendor/html-scanner/html/tokenizer.rb
index b950e84628..22df33afbe 100644
--- a/actionpack/lib/action_controller/vendor/html-scanner/html/tokenizer.rb
+++ b/actionpack/lib/action_controller/vendor/html-scanner/html/tokenizer.rb
@@ -58,6 +58,9 @@ module HTML #:nodoc:
         elsif @scanner.scan(/!/) # doctype
           tag << @scanner.matched
           tag << consume_quoted_regions
+        elsif @scanner.scan(/\?/) # processing instructions, drop them
+          tag = ''
+          @scanner.scan_until(/\/>/)
         else
           tag << consume_quoted_regions
         end