Function onloadend

example/tests/gm_xhr_test.js:1164–1168

(response)

                events.push("ontimeout");
              },
              onloadend(response) {
                events.push("onloadend");
                clearTimeout(timer);
                resolve({ events, response });
              },
            });
            if (abortAfterMs != null) {
              setTimeout(() => req.abort(), abortAfterMs);