The ProgressEvent.loaded read-only property is an integer representing the amount of work already performed by the underlying process. The ratio of work done can be calculated with the property and ProgressEvent.total. When downloading a resource using HTTP, this only represent the part of the content itself, not headers and other overhead.
value = ProgressEvent.loaded
| Specification | Status | Comment |
|---|---|---|
| XMLHttpRequest The definition of 'ProgressEvent.loaded' in that specification. | Living Standard |
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support | No | Yes | 3.5 | No | No | No |
| Mobile | |||||||
|---|---|---|---|---|---|---|---|
| Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | No | No | Yes | 4 | No | No | No |
ProgressEvent interface it belongs to.
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https://developer.mozilla.org/en-US/docs/Web/API/ProgressEvent/loaded