Editing Use HTML with the Email Designer (section)

=== Configuration Options and Settings ===

Using HTML within the Email Designer comes with specific configurations and limitations. Here are key points to consider:

* The {{HTML content block}} is a distinct feature; HTML added here does not apply to other blocks.
* You must avoid incorporating unsupported tags within your HTML code, including:
  * '''<button>'''
  * '''<form>'''
  * '''<input>'''
  * '''<select>'''
  * '''<textarea>'''
  * '''<iframe>'''
  * '''<script>'''
  * '''<video>''' 

These elements may cause rendering issues in various email clients, including Gmail and Yahoo.