308549 2026-02-24 06:08:46 -0800 Range.deleteContents() and extractContents() collapse range after mutations, can produce invalid position 2026-03-06 11:56:04 -0800 1 1 1 Unclassified WebKit HTML Editing WebKit Nightly Build Unspecified Unspecified RESOLVED WORKSFORME InRadar P2 Normal --- 1 steven webkit-unassigned annevk cdumez rniwa steven webkit-bug-importer wenson_hsieh oldest_to_newest 2184407 0 steven 2026-02-24 06:08:46 -0800 `Range.deleteContents()` and the `extract` algorithm compute the collapse target `(newNode, newOffset)` before mutations but apply it after all DOM mutations complete. Script running during `remove` (via "removing steps" hooks) could modify the DOM and make those pre-computed values point to an invalid position. The DOM spec is being fixed to move the collapse step before mutations, relying on the built-in `live range pre-remove steps` and `replace data` range adjustments to maintain validity. Steps to reproduce: 1. Create a Range spanning multiple child nodes of a container element 2. Call range.deleteContents() or range.extractContents() 3. Inspect the range's startContainer, startOffset, endContainer, endOffset All current browsers pass the attached conformance tests today because no removing step currently fires synchronous script, but the code path is latently incorrect. Spec issue: https://github.com/whatwg/dom/issues/1446 Chromium bug: https://issues.chromium.org/issues/486922855 Gecko bug: https://bugzilla.mozilla.org/show_bug.cgi?id=2018839 2184410 1 478460 steven 2026-02-24 06:13:26 -0800 Created attachment 478460 Conformance test verifying Range collapse position after deleteContents/extractContents 2186532 2 webkit-bug-importer 2026-03-03 06:09:11 -0800 <rdar://problem/171618174> 2187818 3 steven 2026-03-06 10:01:49 -0800 Follow-up from empirical testing (whatwg/dom#1452 comment): My original "latent bug" characterization was based on a mistaken assumption that no removing step currently fires synchronous script. That was wrong. Safari 18 already produces `startOffset: 0` (collapse-before-mutations) when a `disconnectedCallback` or iframe `pagehide`/`unload` removes a sibling node mid-operation. The spec change (whatwg/dom#1452) is a clarification aligning the algorithm with existing browser behavior, not a fix for a shipping bug. I apologize for the noise. Please close as appropriate. 478460 2026-02-24 06:13:26 -0800 2026-02-24 06:13:26 -0800 Conformance test verifying Range collapse position after deleteContents/extractContents range-collapse-repro.html text/html 9213 steven PCFkb2N0eXBlIGh0bWw+CjxodG1sPgo8aGVhZD4KICA8bWV0YSBjaGFyc2V0PSJ1dGYtOCI+CiAg PHRpdGxlPlJhbmdlIGNvbGxhcHNlIHBvc2l0aW9uIHRlc3Qg4oCUIHdoYXR3Zy9kb20jMTQ0Njwv dGl0bGU+CiAgPHN0eWxlPgogICAgYm9keSB7IGZvbnQtZmFtaWx5OiBzeXN0ZW0tdWksIHNhbnMt c2VyaWY7IG1heC13aWR0aDogNzIwcHg7IG1hcmdpbjogMmVtIGF1dG87IGxpbmUtaGVpZ2h0OiAx LjY7IH0KICAgIGgxIHsgZm9udC1zaXplOiAxLjNlbTsgfQogICAgLnBhc3MgeyBjb2xvcjogZ3Jl ZW47IGZvbnQtd2VpZ2h0OiBib2xkOyB9CiAgICAuZmFpbCB7IGNvbG9yOiByZWQ7IGZvbnQtd2Vp Z2h0OiBib2xkOyB9CiAgICAudGVzdCB7IG1hcmdpbjogMS41ZW0gMDsgcGFkZGluZzogMWVtOyBi b3JkZXI6IDFweCBzb2xpZCAjZGRkOyBib3JkZXItcmFkaXVzOiA2cHg7IH0KICAgIC50ZXN0IGgz IHsgbWFyZ2luOiAwIDAgMC41ZW07IGZvbnQtc2l6ZTogMWVtOyB9CiAgICAuc2V0dXAsIC5leHBl Y3QsIC5yZXN1bHQgeyBtYXJnaW46IDAuM2VtIDA7IH0KICAgIC5sYWJlbCB7IGNvbG9yOiAjNjY2 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