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Core CSS: Part I
An educational resource designed to teach foundational CSS concepts and best practices to developers new to styling
last checked Jul 12, 2026 · Unknown
CohortClass of 2016What it is
An educational resource designed to teach foundational CSS concepts and best practices to developers new to styling. Covers essential techniques for building modern web interfaces with clean, maintainable stylesheets.
HTTP liveness
9 probes since Jun 16Jun 16Jul 12
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Jun 16, 2026First probe — unverifiedUnknown
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Pulse Indexobserved activity
9 probes0 pressGitHub –Tranco –
Not enough observed signals for a Pulse Index (needs 2+ signal families).
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