Daring Fireball: The Tragedy of Safari 15 for Mac’s ‘Tabs’
The most controversial Mac Safari changes shown at WWDC — compressing tabs and the URL location field into a single row at the top of each window.
StopTheMadness
An extension for Safari, Firefox, Google Chrome, Microsoft Edge, and Brave that stops web sites from making your browser harder to use. And it protects your privacy on the web!
Request with Intent: Caching Strategies in the Age of PWAs
Once upon a time, we relied on browsers to handle caching for us; as developers in those days, we had very little control. But then came Progressive Web Apps (PWAs), Service Workers, and the Cache API.
Adactio: Journal—WorldWideWeb
How to Stop Using Browser Dev Tools and Start Using Your Editor’s Debugger — JavaScript January
5 cross-browser testing tools to try today | Creative Bloq
What is Firefox Focus? | Firefox Focus Help
Browser Extensions I Actually Use - The Media Temple Blog
Quick Tip: How to Target IE6, IE7, and IE8 Uniquely with 4 Characters | Nettuts+
A reminder of IE8/IE7/IE6 hacks
Sauce Labs: Mac
Browser testing
Using HTML5 to Determine User Location
HTML5 Video Player | VideoJS
How to Create Application Shortcuts in Google Chrome for Mac
Alternative to Fluid is you want to use Chrome to create an application shortcut
Fixing position:fixed for Windows Internet Explorer
Useful overview of existing solutions
ProtoFluid - HTML5 and CSS3 Web App Prototyping
Test your @media queries and web app on various screen sizes
HTML5 Readiness
Compare browser support of HTML5/CSS3 features
The HTML5 test
How well does your browser support HTML5?
CSS3 Please! The Cross-Browser CSS3 Rule Generator
You can edit the underlined values in this css file but don't worry about making sure the corresponding values match, that's all done automagically for you.
Install multiple versions of IE on your PC | TredoSoft
For use on Windows
Browser Size
Check your visitor's browser size
Web Font Specimen
See how type looks on the web
Video on the Web - Dive Into HTML5
A comprehensive guide on how to embed video written by Mark Pilgrim
High Performance Web Sites :: @font-face and performance
How does @font-face impact performance
FindMyByIP
What's my IP address and how modern is my browser
Why Corporations Don’t Upgrade IE6 and How Chrome Frame Could Help
Google's cleaver solution to IE's legacy
Conditional-CSS
Conditional-CSS allows you to write maintainable CSS with conditional logic to target specific CSS statements at both individual browsers and groups of browsers.
Proudly Announcing: Modernizr | FarukAt.eş
Modernizr is a small JavaScript toolkit that uses feature detection techniques to determine whether or not the current browser is capable of any of the following features from CSS3 and HTML5.