Methods: First open a training video, then F 12, and enter the following code in the console: document. getelementsbytagname(' video ')[0]。 Playback rate = 4. This is four times the speed. The range of this value in Chrome browser is 0.07- 16. Please check or test other browsers or industry standards yourself. Anyway, people watching video 0.5-4 times is already the limit range, which is completely enough.