HTMLFieldSetElement: disabled property

The disabled property of the HTMLFieldSetElement interface is a boolean value that reflects the <fieldset> element's disabled attribute, which indicates whether the control is disabled.

When disabled, all the form control descendants of the <fieldset> element, excluding elements that are descendants of the <legend> child of the <fieldset>, if any, are disabled. A disabled element is unusable and un-clickable, and match the :disabled selector, even if their disabled property value is false.

const fs = document.getElementById("billing-address");
console.log(fs.disabled);
fs.disabled = true;