We add some CSS, including a background image requesting a binary file:
button{display: inline-block;min-height: 100px;min-width: 100px;background: no-repeat 5% center url(magicwand.png) aqua;}
We get the element's style map. We then get() the background-image from the stylemap and stringify it:
// get the elementconst button = document.querySelector('button');// Retrieve all computed styles with computedStyleMap()const allComputedStyles = button.computedStyleMap();// Return the CSSImageValue Example
console.log( allComputedStyles.get('background-image'));
console.log( allComputedStyles.get('background-image').toString());