Unprefixed `user-select`

[BenjaminAster]

Description

The user-select CSS property still needs a -webkit- prefix in WebKit. Reading through the WebKit issue, there seem to be various open bugs, some of which block unprefixing the property.

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This issue is one of seven issues regarding unprefixing CSS properties/values, originally all in #702 (as per https://github.com/web-platform-tests/interop/issues/702#issuecomment-2358173009). The aim is to group the properties together into multiple (but not seven) focus areas.

Specification

https://drafts.csswg.org/css-ui-4/#content-selection

Additional Signals

No response