The triangle is the most popular shape in CSS since years. If you google "how to create a triangle using CSS" you will get a ton of old and obsolet...
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Border triangles did have their charm though, no?
I don't actually recommend ever doing this anymore 😅
Such triangles belong into a museum for history purpose 🙃
Nice article. No more wrestling with border triangles.
That's nice, but do you have performance and compatibility comparison?