FA-31394 / Keyboard interactions / Member archive
Keyboard default edit cancellation pipeline: Keyboard default mutation is suppressed despite a noncancelable keydown · case 04
The event trace violates the keydown cancelable rule and produces incorrect keyboard state or command output.
Case contract
Case [text,lo,hi,key,prevent_down,prevent_before,cancelable,readonly]. Selection is a valid half-open code-point interval. Printable single characters replace selection, Backspace deletes previous point and Delete deletes next point for collapsed selections. Other keys do not edit. A cancelable prevented keydown stops editing; readonly suppresses beforeinput. A changed candidate fires beforeinput, cancellation suppresses mutation; successful edit fires input. Always log keydown and keyup. Return text, selection endpoints and event log. Inputs are finite ordered event traces; return the stated deterministic state. Batch entries are independent. N varies the number of independent input transactions.
Why this case matters
Controlled keyboard event processing model for debugging application event logic.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| key-default-edit scenario 9 | [["abc", 1, 1, ["keydown", "keyup"]], ["abc", 1, 1, ["keydown", "keyup"]], ["abc", 1, 1, ["keydown", "keyup"]], ["abc", 1, 1, ["keydown", "keyup"]]] | [["aXbc", 2, 2, ["keydown", "beforeinput", "input", "keyup"]], ["aXbc", 2, 2, ["keydown", "beforeinput", "input", "keyup"]], ["aXbc", 2, 2, ["keydown", "beforeinput", "input", "keyup"]], ["aXbc", 2, 2, ["keydown", "beforeinput", "input", "keyup"]]] | Failed |
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