While messages passed to `wp.speak.a11y()` should preferably be meaningful,
short, and carefully crafted case by case, this will ensure any HTML tags will
be stripped out from the message string.
Props adamsilverstein.
Fixes#37382.
Built from https://develop.svn.wordpress.org/trunk@38115
git-svn-id: http://core.svn.wordpress.org/trunk@38056 1a063a9b-81f0-0310-95a4-ce76da25c4cd
When Firefox repaints some elements, NVDA may announce "alert" even when there's
no actual message dispatched to the live region. The NVDA implementation differs
from other screen readers and is currently under discussion. To avoid a subpar
user experience better to remove the roles since they're basically redundant.
Fixes#36289.
Built from https://develop.svn.wordpress.org/trunk@37734
git-svn-id: http://core.svn.wordpress.org/trunk@37699 1a063a9b-81f0-0310-95a4-ce76da25c4cd
