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Best HTML Validator Plus Alternatives
Here are some Firefox add-ons that are similar to HTML Validator Plus:
Html Validator
Marc Gueury
6K 4.23 
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Validate HTML
OKVIP
- 0.00 (0) 
HTML Tag Error Checker
macha
87 0.00 (0) 
(X)HTML5 Checker
Francesco De Stefano
75 3.33 (3) 
HTML, CSS, JS Validator
Martin Sullivan
1 1.00 (1) HTML Valid
Sonclub
- 0.00 (0) 
CSS Lint Checker
789BET
- 0.00 (0) 
CSS Validation Checker
Lô đề online
6 0.00 (0) 
Code Compliance
James Crooke
9 5.00 (1) 
Website Health Checker
Timeless Web Builders
8 0.00 (0) 
Web Developer Checklist
Toptal
708 4.25 (20) 
webhint
webhint
2K 4.64 (39)