Web Developer Checklist

Play Framework

Best practices

Read this link◄
- What you should know
Use HTML 5 templates◄
- Initializr
- HTML 5 Boilerplate
Fix broken links◄
- W3C link checker
- iWebTool Broken Link Checker
Spell-check◄
- IntelliJ IDEA Spell Checker
Check website in all browsers◄
Remove 'www' subdomain
Add the attribute rel='nofollow' to user-generated links to avoid spam
Redirect after a POST to prevent a refresh from submitting again

Mobile

MobileOK score of 75+◄
- W3C mobile checker
Use 'viewport' meta-tag◄
- Don’t Forget the Viewport Meta Tag
- Make your website mobile friendly
Use correct input types◄
- Input type: Email, Url, Phone
- Diving in to HTML5 forms
Manual check using emulators◄

Analytics

Uptime monitoring◄
Traffic analysis◄

Performance

Google Page Speed score of 90+◄
- Google Page Speed
- Google Speedtracer
Yahoo YSlow score of 85+◄
- Yahoo's YSlow
Optimize HTTP headers◄
- redbot.org
Use CSS Sprites◄
- Sprite Me
Optimize images ◄
Use Content Distribution Network◄
Cloud optimizations◄
- Reduce I/O to disk
Static resources◄

Usability

HTML5 compatibility check◄
- Compat Inspector
- Modernizr JS library
Custom 404 page◄
- A more useful 404
Favicon◄
Use friendly URLs◄
- 11 best practices for URLs
Have a unified notification system across app
Don't display unfriendly errors directly to the user
Add search feature◄
- Google Custom Search
- Consider 'Open Search'
Environment Integration◄
- Safari on iOS
- Internet Explorer on Windows
Test Responsive design◄
- Responsive.is Tester

Code quality

HTML validation◄
- W3C HTML validator
- Dr. Watson
CSS validation◄
- W3C CSS validator
Run CSS Lint◄
- Run CSS Lint online
Run JSLint/JSHint◄
- Run JSLint online
- Run JSHint online
World ready◄
- W3C i18n checker
Verify source code (Scala)◄
- Scala Style
- SCCT

SEO

SenSEO score of 85+◄
Google Rich Snippets◄
- Online tester
- Getting started
robots.txt◄
- robots.txt tutorial
- Create robots.txt online
XML sitemap◄
- Create sitemap online
A/B Testing◄
- ABalytics

Semantics

Add meaning with Microdata◄
- Schema.org reference
- Schema-Creator.org
Check the semantics◄
- W3C semantic extractor

Accessibility

Accessibility validation◄
Color contrast◄
- Check color contrast online
WAI-ARIA Landmarks◄

Security

Follow best practices◄
Cross-site scripting◄
Cross-site request forgery◄
- Explanation and walkthrough
- CSRF cheat sheet
Secure Passwords◄
Secure connection (SSL)◄
HTTP Strict Transport Security◄
- MDN Overview
- OWASP Overview

Social Media

Open Graph protocol◄
- Open Graph protocol reference
Twitter Cards◄
- Documentation
- Preview Tool
Facebook Insights◄
- Facebook Insights

...and finally

Add humans.txt◄
- We are humans, not machines!
Use PVM◄
- Play Version Manager

Optional: 0/9