@ethan hi there, thank you for your reply.
I was tried all your suggest, but it just give me HTML, and I can not affect children of HTML,
For example, I received a long HTML post included images, href, text... for images, something is very large (the https://rsz.io has API to resize it before it load), for href, users just see it, not clickable.
So I want to find a way to affect all of HTML's children same time.
Maybe, if [content has href/images], then [change link color/ resize images]
Is it possible?