Status
This page documents the implementation status of various HTML and CSS features in Blitz.
This page documents Blitz's scores on the "css" subsuite of the Web Platform Tests.
Note: As it does not have a JavaScript engine, Blitz can only run about 20% of the total subtests. In the numbers below, tests that Blitz can't run are ignored and percentages are relative to the number of tests run.
Data from commit:
1093b86 wpt: skip non-UTF-8 test files instead of crashing (#659) (2026-08-09)
wpt / css / css-flexbox
| Area | Interop Score | Tests | Test % | Subtests | Subtest % |
|---|---|---|---|---|---|
| Total | 66.40% | (799/1236) | 64.64% | (1996/3543) | 56.34% |
| abspos | 79.20% | (53/69) | 76.81% | (605/767) | 78.88% |
| alignment | 19.90% | (1/34) | 2.94% | (106/423) | 25.06% |
| balance | 10.30% | (4/41) | 9.76% | (5/44) | 11.36% |
| flex-lines | 100.00% | (4/4) | 100.00% | (4/4) | 100.00% |
| intrinsic-size | 16.70% | (5/33) | 15.15% | (8/45) | 17.78% |
| order | 75.00% | (3/4) | 75.00% | (3/4) | 75.00% |