title: Tiny MCE v2.1 code editor
body: <p>Call me old fashioned, but there is nothing I can do but only to use the old version of Tiny MCE, which is 2.1.</p>
  
  <p>So, what I'm trying to do is to add a "download" attribute to  tag, after I open HTML editor I type this attribute, when saving it simply disappears. There is no official documentation to this old version on the official site. The new ones doesn't mention anything about this feature at all. <a href="https://i.stack.imgur.com/amokQ.jpg" rel="nofollow noreferrer">overall editor look. </a><a href="https://i.stack.imgur.com/ONFd4.jpg" rel="nofollow noreferrer">code editor look</a></p>
  
  <p>Also, I tried to add "download" in the extended valid elements configuration:
  extended_valid_elements: "code[class|dir ,however no success as well.</p>
  
  <p>Did anyone by any chance faced the same problem?
  Could use a little bit of help.</p>