Raw HTML tags are visible in the description field in a list view if the field is of type html. The tags are also appearing in the export done from the list view.

1. Create a field on the Task table
   • Name: Description
   • Type: html
   • For comparison, locate the new field close to the string type Description field.
2. Save the changes.
3. Open the form.
4. Fill both fields with text. 
5. Save the changes.
   Note that the string type field appears as expected in list view, but the html type field shows the tags in the list view.

This is expected behaviour and a known design limitation in all current releases. HTML rendering is not allowed in the list view.