Any unnecessary code is stripped out and not rendered in the post-processing stage. A rendering engine creates a structure based on the code specified in the HTML and adds specific styling accordingly to the CSS.
When an email client receives an email, it is a long wall of HTML code wrapped by CSS animation. This discrepancy between different email clients is due to the Rendering engine. This creates some issues because most email clients do not provide the same support for modern web standards as web browsers do and there are no email specific standards in place. In order to make emails look more attractive, users copy existing email templates into Journey Orchestrator and edit accordingly. The most important part of successful email communication is a well-designed and attractive email template. Email marketing is still the most popular mode of communication to reach your customers.