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W3C navigation timings

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Note that this feature is in a private beta program now, related to a renewal of the Full Page Check monitor. See the knowledge base article Full Page Check - What’s new (beta program) for more information on the new features of this monitor type.

The World Wide Web Consortium (or W3C for short) is an international organization, involved in developing standards for the world wide web. As such, it has defined a standard for browsers and web applications to generate and display timing information regarding the loading of webpages. The complete specification of the standard can be found on the W3C website (Copyright © 2012, World Wide Web Consortium).

Uptrends' Full Page Check (FPC) monitor type comes with the option to display a subset of W3C navigation timing metrics (plus some additional information such as Core web vitals). This article will provide you with an overview of the metrics shown and what they mean exactly.

For illustration, the following image shows all navigation timing events as defined by the W3C, on a timeline.

w3c navigation timings (Copyright © 2012, World Wide Web Consortium)

Metrics

This is an overview of the W3C navigation timing metrics you can find in Uptrends' Full Page Checks.

W3C navigation timings in Uptrends

  • Request start: Equal to the requestStart as defined by the W3C. It is a timestamp indicating when the browser starts requesting the resource from the webserver after the DNS lookup and TCP connection.
  • Time to first byte: Equal to the difference between requestStart and responseStart as defined by the W3C. In short, it’s the time between when the first request was sent from browser to server, and when the first bytes of the following response were received by the browser.
  • DOM interactive: Equal to domInteractive as defined by W3c. It is a timestamp, indicating the document readiness is set to “interactive”, to indicate that the browser has stopped parsing the page and the user can start interacting with it. Resources such as scripts, images, stylesheets, or frames may still be loading.
  • DOM completed: Equal to the domComplete as defined by W3C. It is a timestamp, indicating when the main document has been parsed, the DOM has been fully loaded, and the page readiness is set to “complete”.
  • Load event: Equal to loadEventEnd as defined by W3C. It is a timestamp, indicating when the load event of the current document has completed, including all dependent resources such as stylesheets and images.
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