HTML & CSS W3C Validator Pro vs PostMessage Tracker

Adoption and growth comparison · shareable link

Growth comparisons appear once each plugin has a reliable 7- or 30-day baseline.

HTML & CSS W3C Validator Pro vs PostMessage Tracker: users compared over last 90 days.

Comparison of HTML & CSS W3C Validator Pro, PostMessage Tracker
Plugin	Metric	Current	7d	30d	Daily rate (30d)	Rank	Rating	Ratings / day	Updated
HTML & CSS W3C Validator ProChrome Web Store	Users	~197	—	—	—	#5517	4.4	—	Outdated · Oct 22, 2026
PostMessage TrackerChrome Web Store	Users	~186	—	—	—	#5670	5.0	—	Fresh · Nov 5, 2026