Launch checklist

Performance
Image optimization
Time to first paint
Total data transfer size
Analytics and SEO
Social meta tags
Page titles and descriptions
Favicon
Analytics
Google Search Console
robots.txt
Canonical links
Microdata
Accessibility
Keyboard navigation and element roles
Alt and title tags
Contrast ratio
Security
XSS protection
Google Security Scanner
Mixed content (HTTPS everywhere)
Dev cleanup
Console logging
Development/prod-only files
Deployment
Continuous deployment
Preprocessor deployments
Monitoring
Domain
Localization
All content translated
Language chooser
<html lang> tag
<link hreflang> tags