Function addHeader

packages/sanddance/src/headers.ts:23–27

(element: HTMLElement, header: string)

}

function addHeader(element: HTMLElement, header: string) {
    const h = document.createElement('h4');
    h.innerHTML = header;
    element.insertAdjacentElement('beforebegin', h);
}

function existingHeader(element: HTMLElement, header: string) {
    const { previousElementSibling } = element;