demo/dist/demo.js
function increaseVolume(step) {
	      var volume = this.media.muted ? 0 : this.volume;
	      this.volume = volume + (is$1.number(step) ? step : 0);
	    }
function increaseVolume(step) {
	      var volume = this.media.muted ? 0 : this.volume;
	      this.volume = volume + (is$1.number(step) ? step : 0);
	    }
Increase volume
@param {Boolean} step - How much to decrease by (between 0 and 1)