Tim van der Lippe 0c4b185233 script: Fix lookup of properties of DOMStringMap (#43046) ...

The conversion of strings was wrong for `--foo` where it should become
`-Foo`. Instead, it was consuming both the `--` and then would encounter
a `f`.

This moves the relevant algorithms to DOMStringMap and adds
corresponding spec comments to explain what's going on.

This does make us closer to passing
`html/dom/elements/global-attributes/dataset-delete.html` but
unfortunately it still fails because of #12978

Prior to this fix, the value of `d.dataset['-foo']` wasn't undefined.
However, we now fail the assertion where the attribute should remain,
despite the call to delete.

That's because per `LegacyOverrideBuiltIns` we should be checking the
existence of which properties it can delete, before it actually deletes
the attribute. Right now, we do it regardless if it is a valid property
and thus we incorrectly delete the attribute.

Testing: No change in tests, since the test in question has more
assertions that require more fixes

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Signed-off-by: Tim van der Lippe <tvanderlippe@gmail.com>
Signed-off-by: Tim van der Lippe <TimvdLippe@users.noreply.github.com>

2026-03-06 09:58:33 +00:00

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