Generally, we want to separate our CSS code from the HTML code to make things more organized and reusable. Here are some examples of inline CSS added directly to HTML tags: ...

By appending just a few lines of HTML and CSS code, researcher Louis Dion-Marcil showed how an external sender could hide the very warning from an email message.

Now [Andy Green] has extended the possibilities with affordable silicon, by producing a proof-of-concept HTML + CSS renderer over h2 on ESP32 for libwebsockets.