Bug 1259889 Part 2 [1] cannot be reverted cleanly, so I manually undo those
changes in this patch. That is, remove the ability for html.css to
invalidate dynamically since it was added specifically for details element.
Although reftest-stylo.list explicit mentions "DO NOT EDIT!", but I still
remove details pref from the file, since it doesn't harm to edit it anyway.
[1] https://hg.mozilla.org/mozilla-central/rev/30aaf3805b56
MozReview-Commit-ID: FsyTGQTxujh
And mCharCode shouldn't be compared with NS_VK_*, nsIDOMKeyEvent::DOM_VK_*. Additionally, when it's compared with a character constant, cast isn't necessary.
MozReview-Commit-ID: JMT614copjG
The user can switch to the main <summary> by tab key, and toggle the
<details> by either 'space' key or 'enter' key.
'return' key is handled with 'keypress', and the 'space' key is handled
with 'keyup' like the HTMLInputElement.
MozReview-Commit-ID: HE6IduUGCpj
