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)
| Area | Interop Score | Tests | Test % | Subtests | Subtest % |
|---|---|---|---|---|---|
| Total | 37.40% | (684/1950) | 35.08% | (2080/5145) | 40.43% |
| abspos | 58.50% | (101/176) | 57.39% | (369/461) | 80.04% |
| alignment | 42.20% | (122/364) | 33.52% | (590/1533) | 38.49% |
| animation | 100.00% | (2/2) | 100.00% | (2/2) | 100.00% |
| grid-definition | 74.40% | (37/52) | 71.15% | (405/441) | 91.84% |
| grid-items | 73.30% | (144/202) | 71.29% | (261/918) | 28.43% |
| grid-lanes | 13.70% | (115/840) | 13.69% | (119/1131) | 10.52% |
| grid-model | 79.80% | (50/65) | 76.92% | (148/196) | 75.51% |
| implicit-grids | 66.60% | (2/3) | 66.67% | (2/3) | 66.67% |
| layout-algorithm | 36.20% | (14/48) | 29.17% | (67/170) | 39.41% |
| placement | 95.00% | (19/20) | 95.00% | (37/38) | 97.37% |
| subgrid | 35.40% | (41/117) | 35.04% | (42/190) | 22.11% |