Web platform features explorer

Resource size

The decodedBodySize, encodedBodySize, and transferSize properties of the PerformanceResourceTiming API reports the size of resources loaded.

Status

Baseline Widely Available (since 2025-09-27)

Browser support

  • Chrome 54 Released on 2016-10-12
  • Chrome Android 54 Released on 2016-10-19
  • Edge 17 Released on 2018-04-30
  • Firefox 45 Released on 2016-03-08
  • Firefox for Android 45 Released on 2016-03-08
  • Safari 16.4 Released on 2023-03-27
  • Safari on iOS 16.4 Released on 2023-03-27