Level 10 is kind of deceiving with its first interaction and with its false clue like the word cookie it surely points us in wrong direction. But after sometime you will surely find the right path. And with the right kind of tool it will be a lot easier.
After looking for all the cookies I could and getting nothing from them I moved on from them and looked for something else. The clue was yet to be found.
Well, if you don’t use right kind of tool, I believe only luck can get you through this mission. As with me, I always use firefox and with that I use the developer tool or firebug to check the source code of the web pages that are opened. If you look the same source code through firebug you will be amazed to find some things that you may have missed by looking at it directly.
After seeing the first paragraph through firebug I saw that some specific words and characters were in italic. So, I just used all the italic words and combined them and used it in the password block and tada, it worked.
But now another new window opens with an error and it wasn’t next mission as well. So you still have to figure out a way to reach level 11. Check the source code again and you will find the answer.
The way to next level is directory traversal. Level 11: rofl.php.