- Template sections placed above or to the right of the typing keys; the user picks any mix in settings, typing keys included - keysym keys send XKB keysyms on press, optionally repeating - Geometry lays blocks side by side with one key unit; stretch keys are resolved at layout time so composed blocks line up - Toggling a block resizes the window so keys keep their size Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>