Sam Atkins f61c67792d LibWeb/CSS: Allow setting shorthand values with StylePropertyMap.set() ...

Shorthands should be broken up into their longhands, instead of setting
them directly.

There's a catch here with our "positional value list shorthands" like
`margin`: Setting margin to a single value like `CSSUnitValue(10, "px")`
is supposed to fail here, but our type-checking code thinks it's valid
because our JSON for `margin` says it accepts lengths. This is the same
kind of issue that we had for `cursor` discussed in the
"LibWeb/CSS: Support converting CSSUnitValue to a StyleValue" commit.

Will get us a few subtest passes for every shorthand that's tested.

2025-10-09 16:14:58 +02:00

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