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-inline
| Area | Interop Score | Tests | Test % | Subtests | Subtest % |
|---|---|---|---|---|---|
| Total | 14.20% | (26/186) | 13.98% | (31/385) | 8.05% |
| alignment-baseline | 33.30% | (3/9) | 33.33% | (3/9) | 33.33% |
| baseline-shift | 0.00% | (0/8) | 0.00% | (0/8) | 0.00% |
| baseline-source | 9.00% | (1/13) | 7.69% | (5/205) | 2.44% |
| dominant-baseline | 100.00% | (4/4) | 100.00% | (4/4) | 100.00% |
| initial-letter | 1.70% | (1/57) | 1.75% | (1/57) | 1.75% |
| model | 0.00% | (0/6) | 0.00% | (0/6) | 0.00% |
| text-box-trim | 10.40% | (8/79) | 10.13% | (9/86) | 10.47% |
| Test | Subtests | Subtest % | Status |
|---|---|---|---|
| br-font-size.html | (1/1) | 100.00% | PASS |
| br-line-height.html | (1/1) | 100.00% | PASS |
| empty-span-height.html | (1/1) | 100.00% | PASS |
| empty-span-scroll.html | (1/1) | 100.00% | PASS |
| empty-span-size-001.html | (0/1) | 0.00% | FAIL |
| empty-span-size-002.html | (1/1) | 100.00% | PASS |
| empty-text-node-001.html | (1/1) | 100.00% | PASS |
| firefox-bug-1901624-crash.html | (1/1) | 100.00% | PASS |
| inline-002-crash.html | (1/1) | 100.00% | PASS |
| inline-crash.html | (1/1) | 100.00% | PASS |