Avoid JavaScript Most email clients do not support JavaScript due to security reasons. Therefore, it's generally best to avoid using JavaScript in your email campaigns. Instead, focus on creating interactive elements using CSS animations or GIFs.
Use AMP for Email Google's AMP for Email allows for more dynamic and interactive content within emails. However, it’s only supported by a few email clients like Gmail and Yahoo Mail. If you decide to use AMP, make sure you also provide a fallback version for clients that do not support it.
Testing and Validation Before sending out your emails, always test them across different email clients and devices. Tools like Litmus and Email on Acid can help you see how your email will look in various environments. This helps in identifying and fixing any issues related to CSS and JavaScript.