|Duplicate||None||T135341 Convert DropdownInputWidget of Special:ActiveUsers to a multi-select widget|
|Open||None||T135340 Create a PHP-only pendant for TagMultiselectWidget|
|Resolved||matmarex||T117782 Implement CheckboxMultiselectWidget (and CheckboxMultiselectInputWidget)|
<select multiple> has possibly the worst user interface ever created by man, requiring Ctrl+click or click and drag to actually select multiple options. A set of checkboxes (<input type=checkbox>) can provide the same functionality, and MediaWiki uses this widely (e.g. HTMLMultiSelectField generates them). There is no other method, as far as I know.
I think that we should never use <select multiple> and therefore this is a duplicate of T117782.