HTML head tags
Good list of tags that can go in the header section of a web page.
Copy to clipboard pure JavaScript - JSFiddle
Example code for copying rich text to the clipboard from JavaScript.
Beyond appendChild: Better convenience methods for HTML - DEV Community
Short article about some handy DOM manipulation methods and idioms in JavaScript.
Placeholder support for contentEditable elements, without JavaScript
Handy method of adding placeholder-a-like text to contenteditable elements in a document.
A set of free MIT-licensed high-quality SVG icons for UI development.
Handy set of svg-based icons, ideal for websites and web-based apps.
Here’s what I didn’t know about “content” - Manuel Matuzović
Deepish dive into what the content property can do in CSS.
Favicon generator
Very handy favicon generator. Covers all the useful bases.