Day 10: Hold Shift to Check Multiple Checkboxes

The shift key is commonly used to group things together between a selection of two items. For example, selecting one email message, pressing the shift key and selecting another email further down the list. This highlights all emails in between. That's the challenge.

What did I learn?

MouseEvent.shiftKey exists. Which sparked my curiosity in what other MouseEvent properties exist that I don't know about.

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