Useful Resources

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General

• Mozzila Developer Network (MDN)
• CodePen
• JS Fiddle

Validators

• HTML Validator
• CSS Validator
• Link Checker

HTML and CSS

• MDN HTML Reference
• HTML Dog
• HTML Dog CSS Property Link
• CSS Designs
• CSS Zen Garden
• CSS Properties Index
• W3C Cascading Style Sheets home page
• CSS-Tricks
• CSS Font Stack (Safe Web fonts)

JavaScript

• JavaScript.com
• JavaScript For Cats
• MDN JavaScript Reference
• Online JavaScript Beautifier
• JS Hint

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Resource for Programming Environment

• Visual Studio Code
  
• Sublime Text
  

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Misc.

• Exam Clock (http://www.timer-tab.com/)

Web Accessibility