Use only the sample text below. This page has no network requests, saved history or clipboard access. The event display shows native controls, not typed characters.
Focus the first field with the controller, then type frame test 123 on Full Keyboard. Check that characters arrive once and focus stays here.
Press main Enter, then numpad Enter. Each should increase the submit count once.
Use Tab and Shift+Tab to move between fields. Try arrows, Home, End, Backspace, Delete, and numpad navigation with Num Lock off; then numpad digits with Num Lock on.
In the first field, use Ctrl+A, Copy, Tab, then Paste. The second field should contain the same sample. This replaces your clipboard with the sample when you press Copy.
In the multiline field, Enter should insert a newline. Hold Ctrl with one controller and press an arrow with the other. Tap Alt then A to check the modifier display; this page consumes Alt+A.
Switch to another local app while a modifier is latched, then return. Close the dashboard and reopen it. Check that no key or modifier remains stuck.