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Although the standard select input for HTML forms supports a "multiple" attribute which allows users to select multiple options by control- or command- clicking, it's easily one of the most confusing concepts for users to grasp. It’s also fairly clumsy, especially when the list of options is long. It's difficult for users to see which options they have already selected, and if their previous selections scroll out of site, they get nervous that those choices will be lost when they make additional selections. A more friendly and intuitive solution is to allow the user to create a new list of selected items by moving them from the original list into the new list.