I created a subdomain, however when I enter the new subdomain in the browser bar of any browser
only mixed text from my website shows.
Hello EL and welcome,
Are you referring to your Comcast free 3 page website or one of your other customer owned websites? This sounds like and HTML or XML website programming issue because the Comcast free 3 page website comes with access to WebBuilder which is a relatively robust website development environment.
Look forward to hearing more on this from you.