TL;DR: Obsidian’s HTML support lets us embed web pages in notes. I have used this to create a note that will display a random Wikipedia page every time the note is opened.

Introduction

Obsidian will happily render HTML, which is useful as it gives us even more options for layout than are provided out of the box.

I have used this, for example, to allow highlighting in colours other than the default that Obsidian comes with, so, with a bit of CSS, I can highlight text in different colours: