294363 2025-06-11 18:03:13 -0700 canonical serialization returns 0.5 instead of calc(0.5) 2025-12-01 16:48:38 -0800 1 1 1 Unclassified WebKit CSS WebKit Nightly Build Unspecified Unspecified RESOLVED DUPLICATE 296725 http://wpt.live/css/css-color/parsing/opacity-valid.html InRadar, WPTImpact P2 Normal --- 1 karlcow webkit-unassigned koivisto ntim sam webkit-bug-importer oldest_to_newest 2123148 0 karlcow 2025-06-11 18:03:13 -0700 There are 8 tests failing the canonical serializarisation for opacity http://wpt.fyi/css/css-color/parsing/opacity-valid.html http://wpt.live/css/css-color/parsing/opacity-valid.html Copy Paste this in the URL bar of different browsers: data:text/html,<div class="test" style="opacity:clamp(50%,0%,70%)"></div><div class="log"></div><script>document.querySelector(".log").textContent=document.querySelector(".test").style.getPropertyValue("opacity");</script> which is <div class="test" style="opacity: clamp(50%,0%,70%)"></div> document.querySelector(".test").style.getPropertyValue("opacity"); It returns: 0.5 Safari Technology Preview 18.4 (220) 20622.1.14.5 cal(0.5) Firefox Nightly 141.0a1 14125.6.5 clamp(50%, 0%, 70%) Google Chrome Canary 139.0.7233.0 7233.0 2124637 1 webkit-bug-importer 2025-06-18 18:04:16 -0700 <rdar://problem/153784390> 2132424 2 ccarley2 2025-07-24 17:12:24 -0700 Pull request: https://github.com/WebKit/WebKit/pull/48505 2162365 3 ntim 2025-12-01 16:48:38 -0800 *** This bug has been marked as a duplicate of bug 296725 ***