247769 2022-11-10 15:41:47 -0800 CSSOM fails to serialize some shorthands set to 'initial' (or any css-wide keyword) 2022-12-21 07:30:08 -0800 1 1 1 Unclassified WebKit CSS WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=247771 InRadar P2 Normal --- 242775 247988 1 obrufau webkit-unassigned webkit-bug-importer oldest_to_newest 1911695 0 obrufau 2022-11-10 15:41:47 -0800 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 = new Map(); for (let prop of allCSSProps) { style.cssText = ""; style.setProperty(prop, "initial"); let result = style.getPropertyValue(prop); if (result !== "initial") { bad.set(prop, result); } } bad; Expected: empty map Actual: a map with some failures: Map { "-webkit-border-radius" => "", "-webkit-column-break-after" => "", "-webkit-column-break-before" => "", "-webkit-column-break-inside" => "", "-webkit-perspective" => "", "grid" => "", "grid-area" => "initial / initial / initial / initial" "grid-column" => "initial / initial" "grid-row" => "initial / initial" "offset" => "", } 1913306 1 webkit-bug-importer 2022-11-17 15:42:17 -0800 <rdar://problem/102489409> 1921077 2 obrufau 2022-12-21 07:30:08 -0800 Improved in bug 247988, then fixed by bug 242775.