After chatting with @keithamus and @Lukew I thought I'd have a look into CustomStateSet, where you can add states to your #WebComponents that don't manipulate DOM but can be selected in CSS with `my-component:state(statename) {}`. Pretty cool!
developer.mozilla.org/en-US/do…

Thinking about whether an audio player component should use be a toolbar role with a roving tabindex, even though HTML audio controls do not, and if they should, what happens when the left and right arrow keys get you to a range input uses those arrow keys to adjust the number on the input. #a11y #webComponents