The set() method of the StylePropertyMap interface changes the CSS declaration with the given property.

property

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

value

The value the given property should have.

None (undefined).

This example sets the padding-top property, with the given value, within the element's style attribute.

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

// set padding-top on button style attribute
buttonEl.attributeStyleMap.set("padding-top", CSS.px(10));