The HTMLMediaElement.volume property sets the volume at which the media will be played.
A number between 0 and 1, where 0 is effectively muted, and 1 is the loudest possible value.
const obj = document.createElement("audio");
console.log(obj.volume); // 1
obj.volume = 0.75;HTMLMediaElement: Interface used to define the HTMLMediaElement.volume propertyHTMLMediaElement.muted