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 / CSS2 / stacking-context
| Area | Interop Score | Tests | Test % | Subtests | Subtest % |
|---|---|---|---|---|---|
| Total | 57.10% | (4/7) | 57.14% | (4/7) | 57.14% |
| Test | Subtests | Subtest % | Status |
|---|---|---|---|
| composite-change-after-scroll-preserves-stacking-order.html | (1/1) | 100.00% | PASS |
| opacity-affects-block-in-inline.html | (1/1) | 100.00% | PASS |
| opacity-change-parent-stacking-context.html | (0/1) | 0.00% | FAIL |
| opacity-change-twice-stacking-context.html | (0/1) | 0.00% | FAIL |
| opacity-transition-change-parent-stacking-context.html | (0/1) | 0.00% | FAIL |
| root-element-creates-stacking-context.html | (1/1) | 100.00% | PASS |
| zindex-affects-block-in-inline.html | (1/1) | 100.00% | PASS |