Javascript copy rich text format and raw at once

clipboard.js

async function copyToClip(elementId) {
    const rich = document.getElementById(elementId).innerHTML
    const plain = document.getElementById(elementId).innerText    
    if (typeof ClipboardItem !== "undefined") {
        const html = new Blob([rich], { type: "text/html" });
        const text = new Blob([plain], { type: "text/plain" });
        const data = new ClipboardItem({ "text/html": html, "text/plain": text });
        await navigator.clipboard.write([data]);
    } else {
        const cb = e => {
            e.clipboardData.setData("text/html", rich);
            e.clipboardData.setData("text/plain", plain);
            e.preventDefault();
        };
        document.addEventListener("copy", cb);
        document.execCommand("copy");
        document.removeEventListener("copy", cb);
    }
}