I wrote some code in JavaScript and autoplay does not work. How can I fix it? Thank you!

function musicStart() {
    pop = window.open('', 'back__music', 'width=100,height=100', true);
    if (back__music.location.href === 'about:blank') {
        pop.document.write('<audio controls autoplay loop><source src="./music.mp3" type="audio/mp3"/></audio>');
    }