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layout(grid): implement named grid lines and areas (#38306)
### 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
GitHub
parent
a9664c4199
commit
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44 changed files with 260 additions and 553 deletions
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@ -1,74 +1,19 @@
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[grid-template-columns-computed-withcontent.html]
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expected: CRASH
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[Property grid-template-columns value 'none']
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expected: FAIL
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[Property grid-template-columns value '20%']
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expected: FAIL
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[Property grid-template-columns value 'calc(-0.5em + 10px)']
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expected: FAIL
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[Property grid-template-columns value 'calc(0.5em + 10px)']
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expected: FAIL
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[Property grid-template-columns value 'calc(30% + 40px)']
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expected: FAIL
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[Property grid-template-columns value '5fr']
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expected: FAIL
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[Property grid-template-columns value 'min-content']
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expected: FAIL
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[Property grid-template-columns value 'max-content']
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expected: FAIL
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[Property grid-template-columns value 'auto']
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expected: FAIL
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[Property grid-template-columns value 'minmax(10px, auto)']
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expected: FAIL
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[Property grid-template-columns value 'minmax(20%, max-content)']
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expected: FAIL
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[Property grid-template-columns value 'minmax(min-content, calc(-0.5em + 10px))']
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expected: FAIL
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[Property grid-template-columns value 'minmax(auto, 0)']
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expected: FAIL
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[Property grid-template-columns value 'fit-content(70px)']
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expected: FAIL
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[Property grid-template-columns value 'fit-content(20%)']
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expected: FAIL
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[Property grid-template-columns value 'fit-content(calc(-0.5em + 10px))']
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expected: FAIL
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[Property grid-template-columns value 'repeat(1, 10px)']
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expected: FAIL
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[Property grid-template-columns value 'repeat(1, [one two\] 20%)']
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expected: FAIL
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[Property grid-template-columns value 'repeat(2, minmax(10px, auto))']
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expected: FAIL
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[Property grid-template-columns value 'repeat(2, fit-content(20%) [three four\] 30px 40px [five six\])']
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expected: FAIL
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[Property grid-template-columns value 'min-content repeat(5, minmax(10px, auto))']
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expected: FAIL
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[Property grid-template-columns value '[\] 150px [\] 1fr [\]']
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expected: FAIL
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[Property grid-template-columns value 'repeat(auto-fill, 200px)']
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expected: FAIL
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[Property grid-template-columns value 'repeat(auto-fit, [one\] 20%)']
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expected: FAIL
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@ -1,11 +1,4 @@
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[grid-template-columns-computed.html]
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expected: CRASH
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[Property grid-template-columns value 'none']
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expected: FAIL
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[Property grid-template-columns value '1px']
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expected: FAIL
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[Property grid-template-columns value '1px [a\]']
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expected: FAIL
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@ -18,15 +11,6 @@
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[Property grid-template-columns value '[a\] 1px [b\]']
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expected: FAIL
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[Property grid-template-columns value '1px repeat(1, 2px) 3px']
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expected: FAIL
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[Property grid-template-columns value '1px repeat(auto-fill, 2px) 3px']
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expected: FAIL
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[Property grid-template-columns value '1px repeat(auto-fit, 2px) 3px']
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expected: FAIL
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[Property grid-template-columns value '1px [a\] repeat(1, 2px 3px) [b\] 4px']
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expected: FAIL
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@ -71,3 +55,6 @@
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[Property grid-template-columns value '[a\] 1em repeat(auto-fit, 2em [b\] 3em) 4em [d\]']
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expected: FAIL
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[Property grid-template-columns value 'repeat(calc(1 + 3 * sign(100em - 1px)), 150px)']
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expected: FAIL
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@ -1,11 +1,7 @@
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[grid-template-rows-computed-implicit-track.html]
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expected: CRASH
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[Property grid-template-rows value 'none' computes to '10px']
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expected: FAIL
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[Property grid-template-rows value '1px' computes to '10px 1px']
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expected: FAIL
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[Property grid-template-rows value '1px [a\]' computes to '10px 1px [a\]']
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expected: FAIL
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@ -18,15 +14,6 @@
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[Property grid-template-rows value '[a\] 1px [b\]' computes to '10px [a\] 1px [b\]']
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expected: FAIL
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[Property grid-template-rows value '1px repeat(1, 2px) 3px' computes to '10px 1px 2px 3px']
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expected: FAIL
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[Property grid-template-rows value '1px repeat(auto-fill, 2px) 3px' computes to '10px 1px 2px 3px']
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expected: FAIL
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[Property grid-template-rows value '1px repeat(auto-fit, 2px) 3px' computes to '10px 1px 0px 3px']
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expected: FAIL
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[Property grid-template-rows value '1px [a\] repeat(1, 2px 3px) [b\] 4px' computes to '10px 1px [a\] 2px 3px [b\] 4px']
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expected: FAIL
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@ -1,11 +1,4 @@
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[grid-template-rows-computed.html]
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expected: CRASH
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[Property grid-template-rows value 'none']
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expected: FAIL
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[Property grid-template-rows value '1px']
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expected: FAIL
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[Property grid-template-rows value '1px [a\]']
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expected: FAIL
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[Property grid-template-rows value '[a\] 1px [b\]']
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expected: FAIL
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[Property grid-template-rows value '1px repeat(1, 2px) 3px']
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expected: FAIL
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[Property grid-template-rows value '1px repeat(auto-fill, 2px) 3px']
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expected: FAIL
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[Property grid-template-rows value '1px repeat(auto-fit, 2px) 3px']
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expected: FAIL
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[Property grid-template-rows value '1px [a\] repeat(1, 2px 3px) [b\] 4px']
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expected: FAIL
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