Baseline typing and composition in a simple contenteditable region

Phenomenon

This case describes a baseline scenario for inspecting how a plain contenteditable region behaves with typing, composition, and basic navigation keys.

Reproduction example

1. Focus the editable area.
2. Type ASCII text and observe keydown, beforeinput, and input events.
3. Switch to an IME (for example, Korean or Japanese) and type composed characters.
4. Use Backspace and the arrow keys to move the caret.

Observed behavior

• The event order for simple typing is stable within a given browser and OS.
• Composition events fire when using an IME.

Expected behavior

• This scenario is used as a reference. Other cases can be compared against this baseline to detect differences introduced by specific operating systems, devices, browsers, or keyboard layouts.