Fix HTML issues

[briatte]

• missing /article/xhtml entirely

This looks like a URL_Rewrite issue, since the link does not end up on the 404 page, but redirects to /articles.

• code parsing issues on the following

  • accessibility-whack-a-mole
  • motion-with-meaning-semantic-animation-in-interface-design
  • good-designers-good-clients
  • amoreuseful404
  • sandbags
  • daemonskin
  • dom

All these articles (one of them is a column) contain HTML errors that cause libxml2 to fail parsing the main-content <div> properly.

Detailed description of issue here, with massive thanks to @hrbrmstr for helping diagnose the problem.

• [x] Ask for help on Twitter: done
• [x] Ask for help here: @zeldman @alistapart @murtaugh @mkammerer

[briatte]

As of today, issue above is unsolved.

Here is the new list of defective pages (articles and columns, those with links are from 2016):

• accessibility-whack-a-mole
• motion-with-meaning-semantic-animation-in-interface-design
• choosing-a-cms-your-organization-will-love
• hello-my-name-is-error
• designing-safer-web-animation-for-motion-sensitivity
• love-the-web-learn-swift
• reframing-accessibility-for-the-web
• the-merry-stormtrooper
• good-designers-good-clients
• client-relationships-and-the-multi-device-web

Another issue:

• blog post URLs

Some blog posts link to other blog posts by linking to /blog/post/the-title, whereas the website uses slugs of the form /blog/blog/post/the-title. Here's an example.

Pinging @zeldman @alistapart @murtaugh @mkammerer