You can break to a new flexbox row or column without setting the size of an item: add a collapsed flex item between two flex items
Creating a masonry (or mosaic) layout with flexbox produces a grid with a seemingly shuffled and obscure order, but we can achieve a natural ordering by using :nth-child() and the order property
Quickly create grids, masonry, stacks and more layouts with these 10 CSS flexbox templates
Simple guiding principles for making animations more meaningful
A short but sweet tutorial of how to build your first interactive graph with Chart.js
A list of 10 working graphs (bar chart, pie chart, line chart, etc.) with colors and data set up to render decent looking charts that you can copy and paste into your projects.
We can apply one timing function per axis to produce curved paths, by using two or more objects to drive an animation.
Spoiler-alert: you don't. You use a pseudo-element.
I built a collection of compositions to make it easier to find and match Google Web Fonts.
A quick trick: add a pseudo-element and animate it with CSS transitions on hover.
A collection of loading spinners animated with CSS.
I've prepared the most common OS X cursors in a short list, if you want to include cursors in your mockups.