Use https://w3c.github.io/stackoverflow to find current questions and answers at Stack Overflow related to various web-platform technology areas: core web APIs, CSS, graphics and typography, media and WebRTC, platform interaction, security, accessibility, performance and profiling, and more.
https://w3c.github.io/stackoverflow/tags.json has the sets of Stack Overflow tags that are used for narrowing down searches to the relevant technology areas.