Test :user-invalid after input and focus change

[foolip]

#8899 introduced a basic test for :user-error, but in w3c/csswg-drafts#1329 (comment) @fantasai also agreed that testing against this condition would be in line with the spec:

typing at least one character and then moving the focus to another input element

This is blocked on #7434. @kereliuk, could you poke me when it's possible to write such a test, so that I can give it a try?

[fantasai]

Would it be possible to try writing a test with regular keypress events (and maybe .focus() to shift the focus)? I'd expect that will pass: although an UA could in theory decide not to allow scripts to trigger :user-invalid, it seems easier from an implementation perspective (and not really harmful in a practical sense) to not screen them out.

If you make it a self-describing reftest, then the description can detail the requisite manual steps and note that a UA is still considered passing if it fails as scripted reftest but passes the manual-interactive version--that way anyone investigating a fail condition will be alerted to that point, and we have a test without being blocked on #7434.

[kereliuk]

@foolip Sounds good!

[foolip]

@kereliuk, do you think that test_driver.send_keys is now enough to support writing tests for this? Are there any other tests yet that send tab keys to move focus around?

[kereliuk]

@foolip I think it should probably work now!

Here is an example of a test: https://github.com/w3c/web-platform-tests/blob/master/html/editing/focus/sequential-focus-navigation-and-the-tabindex-attribute/focus-tabindex-negative.html

[foolip]

@kereliuk, cool, I've assigned this to myself to give it a try!

[foolip]

@gsnedders, before I try this, does testdriver.js work with reftests?

[gsnedders]

@foolip I think we decided to punt on that until we actually had a need for it?

[foolip]

@gsnedders oh, so deliberately punted, I didn't remember that. Well, here I do need it :)

webcompat/web-bugs#17453 (comment) is going to be another case requiring it.

Can you file an issue detailing what would need to change?

[gsnedders]

#13183 filed for that.