Custom formatting operations cannot be undone

Phenomenon

When using preventDefault() and implementing custom formatting operations (bold, italic, etc.), those operations cannot be undone using Ctrl+Z. The undo stack does not include custom operations.

Reproduction example

1. Implement custom bold formatting with preventDefault()
2. Apply bold to selected text
3. Press Ctrl+Z to undo

Observed behavior

• Bold formatting is not undone
• Browser’s undo stack does not include the operation
• User cannot undo custom formatting
• Undo/redo functionality is broken for custom features

Expected behavior

• Custom formatting should be undoable
• Undo stack should include all operations
• Ctrl+Z should work for custom formatting
• Redo should also work

Browser Comparison

• All browsers: Custom operations not in undo stack
• This is expected when using preventDefault()
• Custom undo/redo implementation needed

Notes and possible direction for workarounds

• Implement custom undo/redo stack
• Save state before each formatting operation
• Restore state on undo
• Handle Ctrl+Z and Ctrl+Y manually