Great list, but Twitter is really not the best platform for this kind of content. Some of the screenshots have such bad compression artifacts that it's difficult to make out the before/after changes. For example: https://pbs.twimg.com/media/DDf7ef1XkAMh3Gp.jpg:large
This is a much more readable version (though doesn't include the handy CSS annotations):
This is a much more readable version (though doesn't include the handy CSS annotations):
https://codepen.io/tyrellrummage/full/ZJPXgy/