Background music in 2020 in all browsers

We're developing an html game and we play some background music with author text. How to add background music in 2020 that works in all browsers, respecting all policies. Used variant with , .

<audio id="theme" autoplay="autoplay" controls="controls">
     <source src="ep1.mp3" />     
 </audio>
 <embed src="ep1.mp3" autostart="true" hidden="false" loop="false" width="300" height="65" align="bottom">