在PHP应用程序中加载Gmail消息体 - 如何包含脚本，js等？

So I'm working on a little web app for my colleagues and I'm loading messages from a label of their choosing from the gmail inboxes into the web app. Everything is working properly when the messages are basic, just text, etc.

However, as soon as I am dealing with "real-world" messages full of JS and CSS and what not the messages often "breakout" of their table and mess up the rest of my page.

So far I've tried the following:

I've got a little php function to strip script tags:

function stripHTML($html) {

  $dom = new DOMDocument();
  $dom->loadHTML($html);
  $script = $dom->getElementsByTagName('script');
  $remove = [];

  foreach($script as $item) {
    $remove[] = $item;
  }

  foreach ($remove as $item) {
    $item->parentNode->removeChild($item);
  }

  $html = $dom->saveHTML();
  return $html;
}

However, that is still obviously not doing the trick.

Can I wrap them in an iframe somehow maybe?