Widely Available
Performance
id: resource-size
Resource size
The
decodedBodySize, encodedBodySize, and transferSize properties of the PerformanceResourceTiming API reports the size of resources loaded.
Baseline Status:
Achieved Widely Available on Sep 27, 2025 (Cross-browser Newly Available since Mar 27, 2023).
Desktop Browser Engine Support
Google Chrome
54
Supported
Mozilla Firefox
45
Supported
Apple Safari
16.4
Supported
Microsoft Edge
17
Supported
Mobile Browser Engine Support
Chrome Android
54
Firefox Android
45
Safari iOS
16.4
Specifications and References