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[FormControlRange-interactive-basic.html]
[Insertion: at start boundary keeps start; end extends (multi-char) (input).]
expected: FAIL
[Insertion: inside range extends end by length (input).]
expected: FAIL
[Insertion: at end boundary leaves offsets unchanged (multi-char) (input).]
expected: FAIL
[Equal-length replacement: single char inside range (input).]
expected: FAIL
[Deletion: backspace before range shifts both left (input).]
expected: FAIL
[Deletion: forward delete inside range contracts end by 1 (input).]
expected: FAIL
[Deletion: forward delete at end boundary no effect on range (input).]
expected: FAIL
[Deletion: backspace at control start is no-op (input).]
expected: FAIL
[Insertion: at start boundary keeps start; end extends (multi-char) (textarea).]
expected: FAIL
[Insertion: inside range extends end by length (textarea).]
expected: FAIL
[Insertion: at end boundary leaves offsets unchanged (multi-char) (textarea).]
expected: FAIL
[Equal-length replacement: single char inside range (textarea).]
expected: FAIL
[Deletion: backspace before range shifts both left (textarea).]
expected: FAIL
[Deletion: forward delete inside range contracts end by 1 (textarea).]
expected: FAIL
[Deletion: forward delete at end boundary no effect on range (textarea).]
expected: FAIL
[Deletion: backspace at control start is no-op (textarea).]
expected: FAIL