247771 2022-11-10 16:25:38 -0800 CSSOM serializes most shorthands without checking !important flag 2022-11-17 00:00:17 -0800 1 1 1 Unclassified WebKit CSS WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=247769 https://github.com/web-platform-tests/wpt/pull/36984 InRadar P2 Normal --- 1 obrufau obrufau webkit-bug-importer oldest_to_newest 1911701 0 obrufau 2022-11-10 16:25:38 -0800 From https://drafts.csswg.org/cssom/#dom-cssstyledeclaration-getpropertyvalue 3. If important flags of all declarations in list are same, then return the serialization of list. 4. Return the empty string. Run this code: var allCSSProps = new Set(); for (let obj = document.createElement("div").style; obj; obj = Reflect.getPrototypeOf(obj)) { for (let name of Object.getOwnPropertyNames(obj)) { let prop = name.replace(/[A-Z]/g, c => "-" + c.toLowerCase()); if (CSS.supports(prop, "initial")) { allCSSProps.add(prop); } } } var style = document.createElement("div").style; var bad = []; var good = []; for (let prop of allCSSProps) { style.cssText = ""; style.setProperty(prop, "initial"); if (style.length > 1) { style.setProperty(style[0], "initial", "important"); if (style.getPropertyValue(prop) !== "") { bad.push(prop); } else good.push(prop); } } bad; Expected: empty array Actual: [ "-epub-text-emphasis", "-webkit-animation", "-webkit-border-after", "-webkit-border-before", "-webkit-border-end", "-webkit-border-start", "-webkit-column-rule", "-webkit-columns", "-webkit-flex", "-webkit-flex-flow", "-webkit-mask", "-webkit-mask-position", "-webkit-perspective-origin", "-webkit-text-decoration", "-webkit-text-emphasis", "-webkit-text-stroke", "-webkit-transform-origin", "-webkit-transition", "animation", "background", "background-position", "border-block-end", "border-block-start", "border-bottom", "border-inline-end", "border-inline-start", "border-left", "border-right", "border-spacing", "border-top", "column-rule", "columns", "container", "flex", "flex-flow", "font", "font-synthesis", "font-variant", "grid-area", "grid-column", "grid-row", "grid-template", "list-style", "marker", "mask", "mask-position", "outline", "perspective-origin", "place-content", "place-items", "place-self", "text-emphasis", "transform-origin", "transition" ] 1912688 1 obrufau 2022-11-15 12:59:43 -0800 Pull request: https://github.com/WebKit/WebKit/pull/6523 1913113 2 ews-feeder 2022-11-16 23:59:51 -0800 Committed 256774@main (dc7aed5d4dc6): <https://commits.webkit.org/256774@main> Reviewed commits have been landed. Closing PR #6523 and removing active labels. 1913114 3 webkit-bug-importer 2022-11-17 00:00:17 -0800 <rdar://problem/102454608>