Validation Services

JSON Validator: http://jsonlint.com

HTML : 5 http://validator.w3.org

CSS : http://jigsaw.w3.org/css-validator

Accessibility : http://wave.webaim.org
http://webaim.org/resources/contrastchecker

RSS/Atom feeds : http://validator.w3.org/feed

MobileOK content : http://validator.w3.org/mobile

http://www.webpagetest.org - speed testing too

http://www.w3.org/QA/Tools

http://www.modern.ie/en-us

Color contrast and ratio calculator:
http://www.msfw.com/Services/ContrastRatioCalculator

http://responsivedesignsimulator.com

Know and use unit tests, automation tests, code coverage, path analysis, source code debuggers, or profiling tools.

knowledge of unit and integration testing methodologies, and the ability to write, debug and deploy testing frameworks.

Blob of test text

http://testcode.soupmode.com/jr2.html

https://www.w3.org/TR/WCAG20/#contents

https://www.w3.org/TR/ATAG20/#contents

https://www.whitehouse.gov/blog/2016/01/11/making-it-accessible-state-union-everyone-can-experience

https://indiewebify.me/ - indieweb compatible

#html - #css - #accessibility - #testing - #json