This is an example of an image with a shape-outside. The image is already transparent so I don't need to clip it as well. The effect really only comes into play if there is enough text to wrap around some of the shapes, so here is a little bit more text. The image is one I drew as an exercise in using the Apple Pencil in Pixelmator. I wrote a few words on it on the ol' blog.
One fun thing to note is that
shape-outside can be animated!
I have a separate lab with CSS animations,
so head over there to see an example.
Your browser devtools likely have a WYSIWYG shapes editor that helps make the correct polygon function. Add a basic polygon yourself and then click the shapes editor to get started. Below is how it looks in Firefox 68.