Why Is CSS So Weird?
https://www.youtube.com/watch?v=aHUtMbJw8iA
If you don't understand why CSS is one of the great strengths of the Web, even if you've been using it for a while, you really have to spend these 15 minutes to watch Miriam Suzanne explain how it came to be, and why it is what it is.
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older link:
The Ultimate Guide to Not Fucking Up Push Notifications -
newer link:
ASPIRE: Ideals to Aspire to When Building Websites