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-layout-api
| Area | Interop Score | Tests | Test % | Subtests | Subtest % |
|---|---|---|---|---|---|
| Total | 0.00% | (0/135) | 0.00% | (0/135) | 0.00% |
| auto-block-size | 0.00% | (0/5) | 0.00% | (0/5) | 0.00% |
| baseline | 0.00% | (0/4) | 0.00% | (0/4) | 0.00% |
| child-constraints | 0.00% | (0/21) | 0.00% | (0/21) | 0.00% |
| constraints | 0.00% | (0/41) | 0.00% | (0/41) | 0.00% |
| edges | 0.00% | (0/14) | 0.00% | (0/14) | 0.00% |
| fallback-intrinsic-sizes | 0.00% | (0/6) | 0.00% | (0/6) | 0.00% |
| fallback-layout | 0.00% | (0/7) | 0.00% | (0/7) | 0.00% |
| intrinsic-sizes | 0.00% | (0/12) | 0.00% | (0/12) | 0.00% |
| layout-child | 0.00% | (0/8) | 0.00% | (0/8) | 0.00% |
| position-fragment | 0.00% | (0/6) | 0.00% | (0/6) | 0.00% |
| Test | Subtests | Subtest % | Status |
|---|---|---|---|
| box-tree-registered.https.html | (0/1) | 0.00% | FAIL |
| box-tree-unregistered.https.html | (0/1) | 0.00% | FAIL |
| constraints-data-function-failure.https.html | (0/1) | 0.00% | FAIL |
| constraints-data-sab-failure.https.html | (0/1) | 0.00% | FAIL |
| constraints-data.https.html | (0/1) | 0.00% | FAIL |
| fragment-data-function-failure.https.html | (0/1) | 0.00% | FAIL |
| fragment-data-immutable.https.html | (0/1) | 0.00% | FAIL |
| fragment-data-sab-failure.https.html | (0/1) | 0.00% | FAIL |
| fragment-data.https.html | (0/1) | 0.00% | FAIL |
| style-map-multi.https.html | (0/1) | 0.00% | FAIL |
| style-map.https.html | (0/1) | 0.00% | FAIL |