Primer
The CSS toolkit and guidelines that power GitHub.
Primer launched on March 23, 2015 with 10 votes, #1,262 of 2,697 launches that month. The site was still online in September 2026, 11 years on.
What it does
Guide to the CSS world
Rankings drop overnight. A client's website goes down. Content changes break meta tags. Technical issues appear without warning. Monthly reports won't catch these problems in time. Clients notice before you... We spent about three months experimenting before we realized our data stack had turned into a Frankenstein of point solutions. Each vendor solved a small part of the pipeline, but... Every organization has run an AI pilot by now. Probably more than one. The demos look fantastic. The board loves what they see. Then the pilot ends. And nothing changes.... Ten QR codes can live comfortably in a spreadsheet. Ten thousand codes distributed across clients, stores, product lines,…from primercss.io
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