Unreviewed scope increase: <input pattern> supporting RegExp v

[zcorpan]

Test List

https://wpt.fyi/results/html/semantics/forms/the-input-element/pattern_attribute.html?label=master&label=experimental&product=chrome&product=firefox&product=safari&aligned&view=interop&q=label%3Ainterop-2022-forms%20or%20label%3Ainterop-2023-forms

Rationale

RegExp v flag wasn't in scope for Interop 2023. The new subtests for whatwg/html#7908 added in web-platform-tests/wpt#38547 currently fail in Firefox and Safari.

• <input pattern> supports set difference syntax
• <input pattern> supports string literal syntax
• <input pattern> enables the RegExp v flag

We could either remove this test file from Interop (since no other subtests fail), or split into two files, or mark the new tests with assert_implements_optional (maybe feature-checking support for the v flag on RegExp).

[foolip]

cc @mathiasbynens. If it's easy to split these tests out, that would be the most expedient I think.

[zcorpan]

PR web-platform-tests/wpt#40343

[zcorpan]

@annevk wrote

I somewhat prefer excluding this instead, but I don't care too strongly.

Either way is ok for me. @foolip what say you?

[foolip]

I've asked @mathiasbynens and we have no strong opinion. I would go with whatever is easiest for everyone involved, and I think splitting like in web-platform-tests/wpt#40343 is easiest.

[zcorpan]

@gsnedders @nt1m fyi

[nt1m]

Seems fine to me either way, no strong opinion.