Parsing/Serialization for scroll-snap-points-*
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Implements Parsing/Serialization for scroll-snap-points-x and scroll-snap-points-y
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This matches the previous default (network.mime.sniff off) behaviour in all
but one case: we will now accept a font without a `Content-Type` header, which
would previously have been ignored.
Make style::context use parking_lot::RwLock
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The main motivation is to use `parking_lot::RwLock` instead of `sync::RwLock` in `style::context`, so that we can make `Stylesheet` be hold in a `parking_lot::RwLock` like other structs used for geckolib.
r? @SimonSapin
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We also make sure that an element never has an ElementData with ElementDataStyles::Uninitialized,
and eagerly call prepare_for_styling whenever an ElementData is instantiated.
MozReview-Commit-ID: 9YP6eSmdMt0
Make test-tidy check for alphabetical ordering of #![feature(...)] statements
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Removed incorrectly exposed webidl interfaces
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Partial fix for #12415
Fixed: Touch, TouchList, ValidityState
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