The former is a spec detail (the result is returned in ns) and the latter is an implementation detail (browsers currently quantize the result to 100us). That is

The former is a spec detail (the result is returned in ns) and the latter is an implementation detail (browsers currently quantize the result to 100us). That is a useful distinction since you can use WebGPU outside of the browser by embedding Dawn or wgpu into your own application, and there you should get the maximum resolution the spec allows for. Environments like Electron might also opt-out of that timing attack mitigation since they're intended to run trusted code. I agree the article could have made that clearer though.