UX details for web developers

A list of implementation details that make for a better / expected user experience. Have these in mind when implementing a web design.

This document outlines a non-exhaustive list of details that make a good (web) interface. It is a living document, periodically updated based on learnings. Some of these may be subjective, but most apply to all websites. The WAI-ARIA spec is deliberately not duplicated in this document. However, some accessibility guidelines may be pointed out.