A great introduction to the concepts around lengths, units, and content-based sizing with layouts based on Grid and Flexbox.
An introduction to HTML’s new
dialog element for adding native modal boxes.
Keith J. Grant
A well presented, visual guide to what different CSS properties do.
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An update to a benchmark for modern web app responsiveness that simulates user interactions upon a basic app. 2.0 better reflects the frameworks, tools, and patterns in wide use today.
Muted autoplay will be fine, but for audio to play some conditions must be met. Only in Chrome Canary for now, but if you use autoplaying videos you need to be prepared.
Works with GitHub Flavored Markdown (GFM) but can be extended with your own extensions. Supports all major browsers (IE10+). GitHub repo.
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'display: contents' is Coming tutorial
Manuel Rego Casasnovas
Small Tweaks To Make a Huge Impact on Your Site's Accessibility tutorial
Decorative Letter Animations with anime.js and Charming tutorial
Some fun shape and letter animation experiments.
Simplifying the Apple Watch Breathe App Animation with CSS Variables tutorial
This goes amazingly deep on the CSS.
Keeping Users Engaged Through Better Front End Performance tutorial
Recording Video and Audio in Browser using the Web Media API video
Zigzag Image–Text Layouts Make Scanning Less Efficient opinion
Nielsen Norman Group
Building a Mind-Controlled HTML5 Video story
Hey Meta: Website Meta Tag Checker and Builder tools
A tool to quickly check and (re)build some of your meta tags.
CSS Cheat Sheet: A Quick Go-To Reference for CSS Goodness tools
Optimize Web App Performance with Datadog tools
Collect and alert on real-time metrics from your web applications and infrastructure. Start a free trial.
canvas-area: Lightweight HTML Container Element for Canvas Elements code
Crooked Style Sheets: How Pure CSS Can Track You on Web Pages code
It’s either a tutorial or a warning, depending on your inclination.
webshot-factory: Web Screenshots at Scale Based on Headless Chrome code
InfiniteGrid: Arrange Card Elements Infinitely on a Grid Layout code
Instagram.css: A Set of Instagram-style Filters Created in Pure CSS code
CSS Background Patterns Found on CodePen code
KaTeX: Fast Math Typesetting for the Web code
Easy-to-use library for TeX math rendering on the web.