title: HTML. changing one form field when another is changed
body: <p>I am still a beginner but I am guessing I need to use Javascript to do this? Can it be done with pure html?</p>
  
  <p>This is what I want to accomplish:
  Upon the field of “ID” change.
  The value of the email” will automatically be generated by adding the suffix
  of @gmail.ca.</p>