307920 2026-02-14 15:35:38 -0800 Incorrect customElementRegistry when using importNode to create elements 2026-03-10 22:49:00 -0700 1 1 1 Unclassified WebKit DOM Safari Technology Preview Mac (Apple Silicon) iOS 26 NEW InRadar P2 Normal --- 154907 1 steveorvell webkit-unassigned mike rniwa webkit-bug-importer oldest_to_newest 2181797 0 steveorvell 2026-02-14 15:35:38 -0800 When `document.importNode` is used to create elements that have a null registry, the resulting elements have an incorrect registry when importNode does not specify a registry. This should create elements with `customElementRegistry` set to the document default registry (e.g. window.customElements), but instead it is set to `undefined`, which incorrect and an invalid value. See reproduction (asserts in console): https://codepen.io/Steve-Orvell/pen/MYeRmQM?editors=0010 2183806 1 webkit-bug-importer 2026-02-21 15:36:11 -0800 <rdar://problem/170893131>