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CSS Reference
A free visual guide to the most popular CSS properties
verified Jul 14, 2026 · HTTP 200
CohortClass of 2016What it is
A free visual guide to the most popular CSS properties. [Developer Tools, Tech]
HTTP liveness
12 probes since Jun 16Jun 16Jul 14
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Jun 16, 2026First probe — liveAlive · 200 OK
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Pulse Indexobserved activity
442/4 signal families
Liveness40%1.00
Press30%no data
GitHub20%no data
Tranco10%0.45
Weighted observed activity · updated Jul 15
Cohort survival · Class of 2016weekly
13,657 products launched in 2016 · 100% still active
13,633 active24 sunset
Still active
100%
Median lifespan
4.9y