Tooltips. You would think these were the hardest problem in web design based on the number of javascript-dependent solutions put out there. Look at a library like html5tooltips.js, do we really need to add 637 lines of javascript to provide a little supplemental info in our interfaces?
Here’s a quick demo that demonstrates a simple, more accessible, approach.
See the Pen Tooltips without JavaScript by Joel Sunman (@damofknowledge) on CodePen.