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Inserts an HTML string before the start of the specified element.
- Use
Element.insertAdjacentHTML()with a position of'beforebegin'to parsehtmlStringand insert it before the start ofel.
const insertBefore = (el, htmlString) => el.insertAdjacentHTML('beforebegin', htmlString);
insertBefore(document.getElementById('myId'), '<p>before</p>'); // <p>before</p> <div id="myId">...</div>
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