• Support -graded
  • Browser
  • OS
  • Device
• Validation
  • Validate HTML
  • Validate CSS
  • Validate JS
• Error handling
  • Check no images
  • Check no CSS
  • Check no JS
  • Check error handling form elements
• Accessibility
  • Check ARIA roles
  • Check JAWS screenreader emulation
  • Check WCAG 2
  • Check tab order
• SEO
  • HTML structure
  • Keywords in content
  • Meta description: 155 characters
  • Title: 65-59 characters
• Optimise
  • Images
    • Picturefill
    • ImageOptim
    • SVG optimised
    • 8-bit PNG with alpha

Reference

http://validator.w3.org/
http://jigsaw.w3.org/css-validator/
http://www.w3.org/TR/WCAG10/full-checklist.html
http://www.w3.org/TR/wai-aria/roles
http://www.bbc.co.uk/guidelines/futuremedia/accessibility/mobile
http://cssmediaqueries.com/