Select multiple dropdown items on mobile

[joshreisner]

currently it's possible to use the command key on mac (windows or ctrl key on windows) to select multiple types.

i'm not sure how to accomplish this on mobile while not making the primary use (selecting individual types) more complex through a secondary "Apply" button.

the first step would be to find a good design example somewhere on the web to review.

[joshreisner]

maybe something like the “basic example” on this page? https://mdbootstrap.com/docs/standard/extended/multiselect/

[joshreisner]

would be good also to re-code these per #263 to be checkboxes (or have that ARIA role at least)