[css-overscroll-behavior] Inheritance, initial

[ewilligers]

Properties inherit or not according to the spec.
Properties have initial values according to the spec.
https://drafts.csswg.org/css-overscroll-behavior/#property-index

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[majido]

lgtm % nit

nit: Do we need to also have an assertion for the longhand syntax e.g.,
assert_not_inherited('overscroll-behavior-y', 'auto', 'contain');

[majido]

Not sure if @bgirard has signed up to do reviews. May want to confirm with them first.

[ewilligers]

I can omit bgirard.

[ewilligers]

nit: Do we need to also have an assertion for the longhand syntax e.g.,
assert_not_inherited('overscroll-behavior-y', 'auto', 'contain');

I am not sure what you mean. That is exactly the proposed test.

Shorthands don't themselves inherit or have initial values, so I skipped overscroll-behavior in the current test, the same as I have omitted shorthands from all the other inheritance tests.

We should additionally have parsing tests, that cover the longhands and the shorthand. e.g. we should have the equivalent to CSS UI parsing tests for each CSS module.

[ewilligers]

@frivoal @plinss Are you happy to be reviewers?