Adaptive Web Design: Crafting Rich Experiences with Progressive Enhancement

OpenDeviceLab.com - Locate, Contribute to and Sponsor an Open Device Lab (ODL)

Access a variety of devices worldwide for free open device lab com helps to locate to sponsor and to donate to open device labs od ls around the world

Text-based web browser - Wikipedia

Dev.Opera — Making websites that work well on Opera Mini

curl - Tutorial

Browserling – Online cross-browser testing

Try for free now cross browser test your websites online in all web browsers internet explorer edge chrome safari firefox and opera

Virtual Machines - Microsoft Edge Developer

Download free virtual machines to test microsoft edge and ie8 to ie11

Emulate and Test Other Browsers - Chrome Developers

Your job doesn t end with ensuring your site runs great across chrome and android even though device mode can simulate a range of other devices like i phones we encourage you to check out other browsers solutions for emulation

DesiredCapabilities · SeleniumHQ/selenium Wiki

A browser automation framework and ecosystem contribute to selenium hq selenium development by creating an account on git hub

GitHub - GoogleChrome/lighthouse: Automated auditing, performance metrics, and best practices for the web.

Automated auditing performance metrics and best practices for the web git hub google chrome lighthouse automated auditing performance metrics and best practices for the web

CSS Feature Toggles

A devtools extension to toggle support of selected css features for testing progressive enhancement fallbacks