JAVASCRIPT HTML

Hello, I need help turning my code into a HTML file so it can populate a webpage. Please add html codes.

CODE

let sourceDoc = document.getElementById("source_doc");

let toc = document.getElementById("toc");

let headingCount =1;

const heading = "H2";

for (let n = sourceDoc.firstElementChild; n !== null; n = n.nextElementSibling) {

if (n.nodeName === heading) {

let anchor = document.createElement("a");

anchor.name = "doclink" + headingCount;

n.insertBefore(anchor, n.firstElementChild);

let listItem = document.createElement("li");

let link = document.createElement("a");

listItem.appendChild(link);

link.textContent = n.textContent;

link.href = "#" + "doclink" + headingCount;

toc.appendChild(listItem);

headingCount++;

}

}

// Append the table of contents to the page

document.body.appendChild(toc);

document.body.appendChild(sourceDoc);