[filter] Visualize title-attributes

[erikkroes]

also, doesn't help pure keyboard (no AT) users. browsers could/should provide a keystroke to make them visible/expand their title without needing to interact/focus on them at all.

https://twitter.com/patrick_h_lauke/status/1314469024374444036

[lloydi]

Suggest that it should be limited to title attributes where title content is not the same as the textContent of the node it's applied to (as many are duplicates).

[erikkroes]

Oh yes. I've seen some terrible misuse of title. Some rules will apply! I think a toggle or shortcut is also very appropriate.