Every relevant "question that may already have [my] answer" uses jQuery, which I am not using.

So, is there any simple way to get the values of selected options in a `<select multiple>` tag, or do I have to loop through all the options to see which ones are selected and manually build an array?

Side-question: Which browsers *don't* support `selectElement.value` and instead require `selectElement.options[selectElement.selectedIndex].value`?