I've learned this trick about 5 years ago and I've waited until last week to find a good reason to use it. Most beautiful day of my life :')
Definitely a rare use case, but I needed to make a chalkboard that scaled based on content layout and screen size, and this was the best way to do that.
Not so rare before border-radius was invented, but at the time border-image didn't exist either, so... Yeah pretty rare.
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