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:
7767a6a WPT runner: add crashtest support (#666) (2026-08-09)
| Area | Interop Score | Tests | Test % | Subtests | Subtest % |
|---|---|---|---|---|---|
| Total | 61.20% | (3824/6247) | 61.21% | (3833/6274) | 61.09% |
| abspos | 31.00% | (9/29) | 31.03% | (9/29) | 31.03% |
| backgrounds | 64.60% | (219/339) | 64.60% | (219/339) | 64.60% |
| bidi-text | 35.20% | (37/105) | 35.24% | (37/105) | 35.24% |
| borders | 75.50% | (381/504) | 75.60% | (381/504) | 75.60% |
| box | 55.50% | (5/9) | 55.56% | (5/9) | 55.56% |
| box-display | 48.30% | (58/120) | 48.33% | (58/120) | 48.33% |
| cascade | 81.20% | (26/32) | 81.25% | (26/32) | 81.25% |
| cascade-import | 87.50% | (7/8) | 87.50% | (7/8) | 87.50% |
| colors | 52.60% | (10/19) | 52.63% | (10/19) | 52.63% |
| css1 | 56.70% | (93/164) | 56.71% | (93/164) | 56.71% |
| css21-errata | 44.40% | (4/9) | 44.44% | (4/9) | 44.44% |
| csswg-issues | 33.30% | (1/3) | 33.33% | (1/3) | 33.33% |
| floats | 62.80% | (76/121) | 62.81% | (76/121) | 62.81% |
| floats-clear | 70.00% | (150/214) | 70.09% | (150/214) | 70.09% |
| fonts | 79.30% | (127/160) | 79.38% | (127/160) | 79.38% |
| generated-content | 11.50% | (26/226) | 11.50% | (26/226) | 11.50% |
| i18n | 0.00% | (0/7) | 0.00% | (0/7) | 0.00% |
| linebox | 67.60% | (131/194) | 67.53% | (133/206) | 64.56% |
| lists | 36.50% | (57/156) | 36.54% | (57/156) | 36.54% |
| margin-padding-clear | 94.10% | (642/682) | 94.13% | (642/682) | 94.13% |
| media | 100.00% | (17/17) | 100.00% | (17/17) | 100.00% |
| normal-flow | 79.40% | (602/758) | 79.42% | (609/768) | 79.30% |
| pagination | 90.60% | (39/43) | 90.70% | (39/43) | 90.70% |
| positioning | 66.20% | (345/521) | 66.22% | (345/526) | 65.59% |
| sec5 | 95.60% | (22/23) | 95.65% | (22/23) | 95.65% |
| selectors | 17.10% | (82/479) | 17.12% | (82/479) | 17.12% |
| stacking-context | 57.10% | (4/7) | 57.14% | (4/7) | 57.14% |
| syntax | 76.00% | (209/275) | 76.00% | (209/275) | 76.00% |
| tables | 15.50% | (58/372) | 15.59% | (58/372) | 15.59% |
| text | 64.80% | (264/407) | 64.86% | (264/407) | 64.86% |
| ui | 100.00% | (52/52) | 100.00% | (52/52) | 100.00% |
| values | 68.00% | (17/25) | 68.00% | (17/25) | 68.00% |
| visudet | 36.10% | (13/36) | 36.11% | (13/36) | 36.11% |
| visufx | 5.70% | (3/52) | 5.77% | (3/52) | 5.77% |
| visuren | 23.50% | (8/34) | 23.53% | (8/34) | 23.53% |
| zindex | 80.60% | (25/31) | 80.65% | (25/31) | 80.65% |
| zorder | 0.00% | (0/1) | 0.00% | (0/1) | 0.00% |
| Test | Subtests | Subtest % | Status |
|---|---|---|---|
| bidi-005.xht | (0/1) | 0.00% | FAIL |
| bidi-006.xht | (0/1) | 0.00% | FAIL |
| bidi-007.xht | (0/1) | 0.00% | FAIL |
| bidi-008.xht | (0/1) | 0.00% | FAIL |
| bidi-009.xht | (0/1) | 0.00% | CRASH |
| bidi-010.xht | (0/1) | 0.00% | FAIL |
| border-seams-001.xht | (0/1) | 0.00% | FAIL |
| css-e-notation-test-1.html | (1/1) | 100.00% | PASS |
| css-e-notation-test-2.html | (1/1) | 100.00% | PASS |
| inline-svg-100-percent-in-body.html | (1/1) | 100.00% | PASS |
| inline-svg-intrinsic-size-100-percent-1.html | (1/1) | 100.00% | PASS |
| inline-svg-intrinsic-size-100-percent-2.html | (0/1) | 0.00% | FAIL |
| inline-svg-margin-padding-border.html | (1/1) | 100.00% | PASS |