The original document is at https://wiki.mozilla.org/AccessibleCaret. I
rewrite the in-tree version a bit, and will point the wiki version to
the in-tree version after this patch lands.
Differential Revision: https://phabricator.services.mozilla.com/D70477
--HG--
rename : layout/base/doc/AccessibleCaretEventHubStates.dot => layout/docs/AccessibleCaretEventHubStates.dot
rename : layout/base/doc/AccessibleCaretEventHubStates.png => layout/docs/AccessibleCaretEventHubStates.png
extra : moz-landing-system : lando
Ting-Yu Lin