299921 2025-09-30 17:57:06 -0700 -epub-* properties shouldn't create webkit-cased IDL attributes 2025-10-09 18:09:44 -0700 1 1 1 Unclassified WebKit CSS WebKit Nightly Build Unspecified Unspecified NEW https://bugs.webkit.org/show_bug.cgi?id=223141 http://wpt.live/css/css-conditional/js/CSS-supports-CSSStyleDeclaration.html InRadar, WPTImpact P2 Normal --- 1 karlcow webkit-unassigned koivisto sam webkit-bug-importer oldest_to_newest 2147372 0 karlcow 2025-09-30 17:57:06 -0700 The initial fix for this test was done in Bug 223141 There are still 19 failures to fix. http://wpt.live/css/css-conditional/js/CSS-supports-CSSStyleDeclaration.html http://wpt.fyi/css/css-conditional/js/CSS-supports-CSSStyleDeclaration.html 19 Fail including 9 about the prefix -epub-* which is converted as Epub by the test script. Fail -epub-caption-side: _webkit_cased_attribute must only exist for -webkit- assert_false: expected false got true Fail -epub-text-combine: _webkit_cased_attribute must only exist for -webkit- assert_false: expected false got true Fail -epub-text-emphasis: _webkit_cased_attribute must only exist for -webkit- assert_false: expected false got true Fail -epub-text-emphasis-color: _webkit_cased_attribute must only exist for -webkit- assert_false: expected false got true Fail -epub-text-emphasis-style: _webkit_cased_attribute must only exist for -webkit- assert_false: expected false got true Fail -epub-text-orientation: _webkit_cased_attribute must only exist for -webkit- assert_false: expected false got true Fail -epub-text-transform: _webkit_cased_attribute must only exist for -webkit- assert_false: expected false got true Fail -epub-word-break: _webkit_cased_attribute must only exist for -webkit- assert_false: expected false got true Fail -epub-writing-mode: _webkit_cased_attribute must only exist for -webkit- assert_false: expected false got true Fail font-display: _camel_cased_attribute v. CSS.supports assert_equals: expected true but got false Fail font-display: _dashed_attribute v. CSS.supports assert_equals: expected true but got false Fail inherits: _camel_cased_attribute v. CSS.supports assert_equals: expected true but got false Fail initial-value: _camel_cased_attribute v. CSS.supports assert_equals: expected true but got false Fail initial-value: _dashed_attribute v. CSS.supports assert_equals: expected true but got false Fail size: _camel_cased_attribute v. CSS.supports assert_equals: expected true but got false Fail src: _camel_cased_attribute v. CSS.supports assert_equals: expected true but got false Fail syntax: _camel_cased_attribute v. CSS.supports assert_equals: expected true but got false Fail unicode-range: _camel_cased_attribute v. CSS.supports assert_equals: expected true but got false Fail unicode-range: _dashed_attribute v. CSS.supports assert_equals: expected true but got false Firefox PASS on all tests 2149288 1 webkit-bug-importer 2025-10-07 17:58:11 -0700 <rdar://problem/162161339> 2149289 2 webkit-bug-importer 2025-10-07 17:58:12 -0700 <rdar://problem/162161344> 2149298 3 karlcow 2025-10-07 18:29:33 -0700 <rdar://problem/162161339> 2149850 4 gsnedders 2025-10-09 18:09:44 -0700 > The initial fix for this test was done in Bug 223141 That was one of three bugs; that we weren't consistently checking runtime feature flags. (Arguably that's many more bugs, because each difference is arguably a separate bug!) > There are still 19 failures to fix. These are two completely different failures which should be tracked separately: The first is about -epub- properties appearing as EpubXXX, which is commented as such in the code: https://github.com/WebKit/WebKit/blob/97d0e362516b8739ab5739302541f7d7b150cbc8/Source/WebCore/css/scripts/process-css-properties.py#L3960-L3972 The second is about properties v. descriptors — historically WebKit (and Blink, given its shared origins) have had a single interface containing all properties and descriptors. Bug 238273 tracks that. So let's use this bug for the first of these.