[split-button] pre-spec research

split-Button - spec

A split button is a dual-function menu button that offers a default action as well as the possibility of choosing a different action by selecting from a set of alternatives.

Nielsen Norman Group

Moreover, split button can be specified as 2 different behaviors:

1. as defined by NNG 👆 set of alternatives set the main action
2. set of alternatives are eagerly invoked actions as presented here

Implementation details:

the button UI is composed of 2 buttons:

1. main action
2. popup trigger chevron like suffixed button

• should they both be included in the tabbing navigation order or align to roving pattern?

• Would focus alone on chevron suffixed button open the popup menu?

• Keep state of where the focus was if the menu closes and opens back?

Some of the points raised and details will really require 1 finite defined behavior mentioned above

argyleink/gui-challenges#63 already touches the topic

Start with the split-button definition and the linked Nielsen Norman Group, web.dev, and argyleink/gui-challenges#63 references. Resolve which of the two behaviors is intended, then define tab order, chevron focus behavior, and focus restoration; done means a finite interaction specification answers these questions.