1. Current product implementation for product-specific behavior.
  2. Apple and WebKit documentation for Safari behavior and extension permissions.
  3. Direct observation for website-specific behavior, with a review date.
  4. Third-party research only when the original source and its limits can be checked.

We do not use word count as a proxy for usefulness. An article should answer one search intent, show the practical decision, explain the mechanism when it matters, and link to the next useful step.