The HTMLMediaElement.defaultPlaybackRate property indicates the default playback rate for the media.
A double. 1.0 is "normal speed," values lower than 1.0 make the media play slower than normal, higher values make it play faster.
NotSupportedError DOMExceptionThrown if the specified value is not supported.
const obj = document.createElement("video");
console.log(obj.defaultPlaybackRate); // 1HTMLMediaElement: Interface used to define the HTMLMediaElement.defaultPlaybackRate property