The most prominent features mentioned on the Tailwind CSS v3.0 release announcement includes:

• Stable Just-in-Time Engine
• Every color out of the box
• Colored box shadows
• Scroll snap API
• Multi-column layout
• Native form control styling
• Print modifier
• Modern aspect ratio API
• Fancy underline styles
• RTL and LTR modifiers
• Portrait and landscape modifiers
• Arbitrary properties
• Play CDN
• and more…

On top of all that, the Tailwind documentation is all brand-new, with fresh, thoughtful examples and everything you need to start mastering Tailwind.