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layout(grid): implement named grid lines and areas (#38306)

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### Changes made

This implements named grid lines (line names in `grid-template-*`),
named grid areas (`grid-template-areas`), and the ability to target
those using `grid-{row,column}-{start,end}`. It also includes a bunch of
miscelaneous fixes for `repeat(auto-fill | auto-fit, ...)` syntax as
that interacts with the specification of line names.

The actual layout implementation is in Taffy. The bulk of this PR is
updating Servo to translate (CSS Grid-related) Stylo types into Taffy
types using a new iterator-based API which uses iterators and lazy
translation for efficiency (which is more important now that we're
dealing with string data, even though they're `Atom`s).

### Testing

This functionality has lots of WPT tests. It fixes some seemingly random
CSS Grid tests that use named lines/areas even though that's not what
they're testing.

### Screenshots

wikipedia.org

<img width="1624" height="1056" alt="Screenshot 2025-07-27 at 20 03 16"
src="https://github.com/user-attachments/assets/2c50b96f-ae36-4405-ac48-b771bfdcb515"
/>

bbc.co.uk:

<img width="1624" height="1056" alt="Screenshot 2025-07-27 at 20 32 57"
src="https://github.com/user-attachments/assets/ba84e211-65d2-4411-95fb-7b9b91bea31c"
/>

theguardian.com:

<img width="1624" height="1056" alt="Screenshot 2025-07-27 at 20 33 29"
src="https://github.com/user-attachments/assets/e85daaa6-5fb0-45d4-b9ec-b22b38b087ec"
/>

---------

Signed-off-by: Nico Burns <nico@nicoburns.com>
This commit is contained in:
Nico Burns 2025-08-07 15:41:19 +01:00 • committed by GitHub
parent a9664c4199
commit fd20a5df42
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44 changed files with 260 additions and 553 deletions
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Cargo.toml
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@ -149,7 +149,7 @@ stylo_traits = { git = "https://github.com/servo/stylo", branch = "2025-08-01" }
surfman = { git = "https://github.com/servo/surfman", rev = "f7688b4585f9e0b5d4bf8ee8e4a91e82349610b1", features = ["chains"] }
syn = { version = "2", default-features = false, features = ["clone-impls", "derive", "parsing"] }
synstructure = "0.13"
taffy = { version = "0.8.3", default-features = false, features = ["detailed_layout_info", "grid", "std"] }
taffy = { version = "0.9", default-features = false, features = ["calc", "detailed_layout_info", "grid", "std"] }
tikv-jemalloc-sys = "0.6.0"
tikv-jemallocator = "0.6.0"
time = { package = "time", version = "0.3", features = ["large-dates", "local-offset", "serde"] }