Tabs versus spaces; two spaces versus four; Windows versus Unix line endings: code editor settings differ per device and developer, which can be a hassle working in a team. There is an easy way to share base settings, and it's called EditorConfig.
One of my web development pet peeves is the disregard for accessibility. In this article, I don't just explain why but give a couple of examples of disabilities that are not just deafness and blindness.