Question about sending emails in php?

What should I do if I want to embed a webpage in the sent email? What are the requirements for webpage creation? What should I do if I want to embed a webpage in the sent email?

What are the requirements for webpage creation?

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What should I do if I want to embed a webpage in the sent email?

What are the requirements for webpage creation?

The general practice is to insert images. If you insert a webpage, you can simply send text with html tags, but the compatibility is poor. There are many mail clients with different style support levels.

I tried HTML mail once, so there are not many problems.
Emails do not need to write the complete html structure, and containers are used, as shown in the following code:

Content

Html head body and other labels are not required. style compatibility is poor. It is recommended to write styles.

Content

In this form, js should not be used.

Html tags that can be parsed