Meta: enable HTML checker

[annevk]

No description provided.

[annevk]

@sideshowbarker I guess we need to decide whether those resources you checked in need to be preserved and excluded from validation or whether we need to fix them. It seems this has found a bunch of legitimate errors too though that are worth fixing.

[annevk]

(I'm happy to fix all errors, but want your opinion first.)

[sideshowbarker]

I think we should skip checking of everything in the webapps and workers subdirectories, but fix any errors in the root index.html file and https://github.com/whatwg/platform.html5.org/blob/master/specs/index.html and https://github.com/whatwg/platform.html5.org/blob/master/history/index.html

[annevk]

@sideshowbarker maybe you can provide the fix for .travis.yml that makes it skip those directories?

[sideshowbarker]

@sideshowbarker maybe you can provide the fix for .travis.yml that makes it skip those directories?

yes (assigning to myself)

[annevk]

@sideshowbarker ping.

[sideshowbarker]

Will get back to this asap (this weekend)