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-sizing
| Area | Interop Score | Tests | Test % | Subtests | Subtest % |
|---|---|---|---|---|---|
| Total | 41.00% | (248/637) | 38.93% | (628/1624) | 38.67% |
| aspect-ratio | 51.40% | (139/274) | 50.73% | (265/485) | 54.64% |
| contain-intrinsic-size | 8.40% | (3/37) | 8.11% | (4/186) | 2.15% |
| responsive-iframe | 43.70% | (7/16) | 43.75% | (7/16) | 43.75% |
| stretch | 34.20% | (15/58) | 25.86% | (67/164) | 40.85% |