Add support for input[minlength], textarea[minlength], and ValidityState.tooShort

[Chris Rebert]

i.e. Implement the `minlength` attribute

Relevant specs:
* https://html.spec.whatwg.org/multipage/forms.html#attr-input-minlength
* https://html.spec.whatwg.org/multipage/forms.html#attr-textarea-minlength
* https://html.spec.whatwg.org/multipage/forms.html#dom-validitystate-tooshort

[Derek Moore]

Don't feel bad, Firefox is also sucking at implementing this: https://bugzilla.mozilla.org/show_bug.cgi?id=932755

[Chris Rebert]

For the record, Blink implements this:
http://caniuse.com/#feat=input-minlength

[Derek Moore]

FWIW, you'll be way ahead of both Chrome/Blink & Mozilla/Firefox if you can make minlength & maxlength work together so as to form a character length range (as per spec)!

See the "Name of Event" example here: https://html.spec.whatwg.org/multipage/forms.html#attr-fe-minlength

[Derek Moore]

(In reply to comment #2)
> For the record, Blink implements this:
> http://caniuse.com/#feat=input-minlength

Logged this bug with them for completeness:
https://bugs.chromium.org/p/chromium/issues/detail?id=614175

[Chris Rebert]

Firefox has implemented this feature in version 51.

[Kai]

Probably fixed by https://bugs.webkit.org/show_bug.cgi?id=161644 ?

Not sure about ValidityState.tooShort, in the diff https://bugs.webkit.org/attachment.cgi?id=288065&action=diff it seems to be at least mentioned.

[Chris Rebert]

*** This bug has been marked as a duplicate of bug 161644 ***