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These metrics are still subject to change in the future.

Apart from the usual HTTP specific metrics that k6 already tracks, the browser module tracks the following browser specific performance metrics on top:

Metric NameDescription
browser_dom_content_loadedEmitted when the page is loaded but scripts have just started to be executed.
browser_first_paintEmitted when the browser renders the first pixel on the page.
browser_first_contentful_paintEmitted when the browser renders the first DOM element on the page, whether that's a text, image or header.
browser_first_meaningful_paintEmitted when the browser renders the main content from above-the-fold that the users are looking for.
browser_loadedEmitted when the page is fully loaded.