Confirmed on Python 3.8.6, bleach 3.2.3.
Bug 1689399 Comment 1 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
Confirmed on Python 3.8.6, bleach 3.2.3. edit: and back to 3.0.0 (going to assume all 3.x impacted)
Confirmed on Python 3.8.6, bleach 3.2.3. edit: and back to 3.0.0 (going to assume all 3.x impacted, also suggests it's not limited to html5lib-1.1)
Confirmed on Python 3.8.6, bleach 3.2.3. edit: and 3.0.0 and 2.0.0 (going to assume all 2.x and 3.x impacted, also suggests it's not limited to html5lib-1.1)