HelloSign: Everything IT requires and Developers love
Update: We're redacting this article. Much of it was work originally done by Art Lawry and published on A List Apart in the article Radio-Controlled Web Design. We didn't appropriately credit that work. Apologies to Art and A List Apart.
Further explanation and more about CSS tabs:
Here at CSS-Tricks, we've been playing with the idea of CSS tabs for years. Half a decade ago we explored seven different techniques (All of them pretty bad, don't use those). We revisited it four years ago and solved some of the shortcomings there, but introduced some new problems.
As ever on the web, there is always new possibilities to explore. I believe the jury is still out on whether form controls are acceptable for accessibility for toggling the visibility of content when display: none is being used to hide that content. Perhaps other hiding methods could be explored.