...What this document is not is a series of explanations as to how front-end technologies work; a basic familiarity is assumed. It also does not provide evaluations of the pros and cons of various alternatives unless there is common confusion about which option is best; when appropriate we pick what we consider to be the best solutions and present them. Issues that don't yet have a clear solution are considered flexible and may or may not be listed. By maintaining consistency in coding styles and conventions, we can ease the burden of legacy code maintenance, and mitigate risk of breakage in the future. ...