Apart from the usual HTTP specific metrics that k6 already tracks, xk6-browser tracks the following browser specific performance metrics on top:
|browser_dom_content_loaded||Emitted when the page is loaded but scripts have just started to be executed.|
|browser_first_paint||Emitted when the browser renders the first pixel on the page.|
|browser_first_contentful_paint||Emitted when the browser renders the first DOM element on the page, whether that's a text, image or header.|
|browser_first_meaningful_paint||Emitted when the browser renders the main content from above-the-fold that the users are looking for.|
|browser_loaded||Emitted when the page is fully loaded.|
Note that the above metrics are still subject to change in the future.