Custom Table Header View with WKWebView not showing - Need Help

Custom_tableHeaderView_with_WKWebView.swift

// THIS CODE DOES NOT SHOW THE HTML. The Gist is for an SO question and for future references.
import UIKit
import WebKit

class TableVC: UIViewController, WKNavigationDelegate {
  let headerView = UITableViewHeaderFooterView()
  let titleView = UILabel()
  let webView = WKWebView()
  
  override func viewDidLoad() {
    super.viewDidLoad()
    setupTable()
    setupHeaderView()
    tableView.tableHeaderView = headerView
  }
  func setupTable() {print("All of the table configurations are left out for the sake of cleanliness. They just included registering cells and using autolayout for the table.")}
  
  func setupHeaderView() {
    titleView.translatesAutoresizingMaskIntoConstraints = false
    webView.translatesAutoresizingMaskIntoConstraints = false
    webView.navigationDelegate = self
    webView.loadHTMLString("<b>HELLO THERE.HELLO THERE.HELLO THERE. HELLO THERE.HELLO THERE.HELLO THERE.HELLO THERE.HELLO THERE.HELLO THERE.HELLO THERE.HELLO THERE.HELLO THERE.HELLO THERE.HELLO THERE.HELLO THERE.HELLO THERE.HELLO THERE.HELLO THERE.HELLO THERE.HELLO THERE.HELLO THERE.HELLO THERE.</b>", 
                           baseURL: nil)
    let lg = headerView.contentView
    lg.addSubview(titleView)
    lg.addSubview(webView)
    let la = lg.leadingAnchor
    let ta = lg.trailingAnchor
    NSLayoutConstraint.activate([
      titleView.topAnchor.constraint(equalTo: lg.topAnchor, constant: 4),
      titleView.leadingAnchor.constraint(equalTo: la, constant: 4),
      titleView.trailingAnchor.constraint(equalTo: ta, constant: -4),
      titleView.bottomAnchor.constraint(equalTo: webView.topAnchor, constant: -7),
      
      webView.leadingAnchor.constraint(equalTo: la, constant: 4),
      webView.trailingAnchor.constraint(equalTo: ta, constant: -4),
      webView.bottomAnchor.constraint(equalTo: lg.bottomAnchor, constant: -4)
    ])
}

I've been reading that I should use viewDidAppear or the navigation delegate that has didFinish, but 1. none of the html is actually loading or can be seen and 2. the WKWebView doesn't take up any space. Please help!