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MarkSheet
A free guide to learn HTML and CSS [Web App, Tech]
verified Jul 11, 2026 · HTTP 200
CohortClass of 2015What it is
A free guide to learn HTML and CSS [Web App, Tech]
HTTP liveness
9 probes since Jun 16Jun 16Jul 11
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
412/4 signal families
Liveness40%1.00
Press30%no data
GitHub20%no data
Tranco10%0.09
Weighted observed activity · updated Jul 15
Cohort survival · Class of 2015weekly
12,940 products launched in 2015 · 100% still active
12,899 active41 sunset
Still active
100%
Median lifespan
4.9y