Three standard formats for web browsrs are .mp3, .wav and .ogg
There are several attributes for audio. Inside audio element, there is source element.
If you have multiple audio files you need to use source element only like for one audio file, one source element and for audio files, two source element. Control attribute is used to provide control for audio file
Value for controls attribute is not neccessary , it is optional If you want to play track automatically when page loaded then you use autoplay attribute and if you want to loop it you can use loop attribute.
you can use draggable attribute, in order to drag anything, this attribute is general not for audio only. here you can forward and backward