Test newline normalization in form-associated custom elements.

[andreubotella]

No description provided.

[domenic]

@tkent-google will probably be the best person to review this, but from what I gather in IRC, you are working on a large project surrounding form data serialization and newlines, and so probably it'd be best to wait on reviews until that's settled and you have a writeup somewhere explaining the desired behavior?

[andreubotella]

Although I ran into this as part of working on whatwg/url#562, these tests (other than the ones that deal with filenames) reflect the spec-mandated behavior: setting a string or a File as a FACE's value should cause the entry construction algorithm to invoke append an entry, which newline-normalizes names and string values; but setting a FormData should cause the entry construction algorithm to append the FormData's entries without normalization.

Since the parts dealing with File objects will probably change, I should probably split them into a .tentative file.

[domenic]

In that case it's probably fine to review and merge as-is. That will make any future reviews for changes related to File objects simpler.

I will assign @tkent-google then, but @tkent-google feel free to say you would rather have someone else review; I realize you did not sign up to review this directory in general.

[andreubotella]

So the (bare) "filename" tests don't agree with the spec as it is right now, but would agree with any change to the spec that would fix whatwg/url#562. But the "FormData filename" tests might depend on the specifics of that fix. So on second thought, it'd be best to remove those or make them tentative for now.