Resource sizeThe decodedBodySize, encodedBodySize, and transferSize properties of the PerformanceResourceTiming API reports the size of resources loaded.performancePerformancewidely2023-03-272025-09-27https://w3c.github.io/resource-timing/#dom-performanceresourcetiming-decodedbodysizehttps://w3c.github.io/resource-timing/#dom-performanceresourcetiming-encodedbodysizehttps://w3c.github.io/resource-timing/#dom-performanceresourcetiming-transfersizehttps://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/transferSizeapi.PerformanceResourceTiming.decodedBodySizeapi.PerformanceResourceTiming.encodedBodySizeapi.PerformanceResourceTiming.transferSizehttps://nowyoucanuse.com/features--resource-size.html