Limitations and differences of HTML in an email vs a web page

Question

What are the limitations of html in an email?

Beyond the fact that for security reason no Javascript is allowed and that Css is inline only

What other considerations are required? How is responsiveness being handled or the diversity between email clients?

Any does and don'ts rules of thumb?

Answer 1

Here are some limitations:

• width should be 600px
• background image is not allowed
• use inline CSS
• try to use table-layout

Here are some links for best practices:

• https://templates.mailchimp.com/getting-started/html-email-basics/
• https://www.sitepoint.com/rules-best-practice-email-design-coding-practices/