via smashingmagazine.com => original post link
You have for sure googled “how to create [shape_name] with CSS” at least once in your front-end career if it’s not something you already have bookmarked. And the number of articles and demos you will find out there is endless.
Good, right? Copy that code and drop it into the ol’ stylesheet. Ship it!
The problem is that you don’t understand how the copied code works. Sure, it got the job done, but many of the most widely used CSS shape snippets are often dated and rely on things like magic numbers to get the shapes just right. So, the next time you go into the code needing to make a change to it, it either makes little sense or is inflexible to the point that you need an entirely new solution.