The delete() method of the StylePropertyMap interface removes the CSS declaration with the given property.

property

An identifier indicating the stylistic feature (e.g. font, width, background color) to remove.

None (undefined).

The following example removes the background-image property from the element's style attribute.

// get the button element
const buttonEl = document.querySelector("button");

// remove background-image from style attribute
buttonEl.attributeStyleMap.delete("background-image");