Select inputs are a decent example of why people reinvent things. There's no native combobox type input; html5 gave us list input + datalist, but no multiple selection. If anything, the select element has been a perfect example of a bad interface design: it is extremely difficult to use with large lists, but the lack of native combobox has had people reinventing the select input for years.

Number inputs have always been a vile thing to work with, as is the "required" attribute.