Twenty Fifteen: Too-wide tables pop-out of posts

[iandstewart]

Example HTML and possible solution here:

​http://www.456bereastreet.com/lab/table-layout-fixed/example-4.html

word-wrap isn't really a solution though for a theme. It's great for case-by-case static sites but it'll just start indiscriminately breaking words everywhere if we use it in a theme.

[iamtakashi]

This is interesting. We already have word-wrap: break-word in .entry-content but it doesn't seem to work in this case.

[iamtakashi]

Prevents HTML tables from becoming too wide.

[iandstewart]

In 30566:

Twenty Fifteen: prevent too-wide tables from popping out of posts.

Props iamtakashi, fixes #30420