Removing HTML tags from email Description field when auto-creating a record

I found some articles about writing a plugin to remove HTML tags from the email Description field, and also a JS web resource method. I am more familiar with JS than writing server side plugins so I implemented the code at the bottom of this article in a web resource and attached it to the Lead onFormLoad event. However, it does not appear to strip the HTML from the Description field on page load. Any ideas how I can determine what the issue is or is there updated JS code that might work, or a different method that can be achieved without writing a plugin?

https://community.dynamics.com/crm/f/117/p/121027/777167#777167