I'm building a small checklist on a website. It'll have multiple items that are able to be "completed" by checking them off the list by ticking a checkbox. However, I also want to add a multi-select feature that a user can select multiple to delete (or a similar action).
Almost all sites have a checkbox reserved for selecting multiple items: look at any email program. The only problem with using that approach is using the checkbox to mark a task as "completed" only seems natural. Wouldn't two different columns of checkboxes be confusing to a user? I've been thinking about a "shift-click" type thing, but that'd be impossible to do on mobile. How should I accomplish this?