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OTP: fix click-to-focus and overwrite-on-retype#42524
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The single-input rewrite left two interaction gaps: clicking a slot didn't position the caret there (slots had pointer-events: none and focus always jumped to the end), and retyping inserted instead of overwriting, so preceding digits shifted along. Keep the single accessible input but make its interaction faithful to the input-otp model: - Represent the active slot as a selection range so the next keystroke overwrites a filled slot or appends to an empty one - Intercept single-char typing and backspace via beforeinput for overwrite semantics; paste/autofill/IME still flow through input - Make slots clickable (pointerdown) to position the caret, clamped to the first empty slot - Land focus on the first empty slot instead of the end; track the caret with a document selectionchange listener
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Summary
The single-input OTP rewrite (#42500) improved accessibility but left two interaction gaps reported after merge:
pointer-events: noneand focus always jumped to the end of the value, so the click position was ignored.<input>inserts, so editing mid-value pushed the remaining digits down. OTP entry expects overwrite.Both stem from the same thing: a single, full-width, centered input can't map a click to a slot, and native editing inserts rather than overwrites.
Approach
Keep the single accessible
<input>(preserving the one-announced-field,autocomplete="one-time-code", SMS autofill, password-manager, and formatted-paste wins) and make its interaction faithful to the input-otp model:[i, i+1]on a filled slot so the next keystroke overwrites it,[i, i]on an empty one so it appends.beforeinputhandler intercepts single-character typing (overwrite + advance) and backspace (clear / step back). Paste, SMS autofill, and IME composition still fall through to the existing bulkinputpath.pointerdownhandler focuses the input and positions the caret on the clicked slot, clamped to the first empty slot.focus()land on the first empty slot instead of the absolute end; a documentselectionchangelistener keeps the active-slot highlight in sync with the caret.