CSS Flex is powerful but takes some practice to fully understand. This tool helps you explore it interactively. Change a setting and watch how it reacts.

On most websites, when you click to a new page there is a brief flicker as the old page disappears and the new one loads and renders. With a simple CSS rule, that can be minimized or even eliminated.

Do you need to see how your website stacks up in speed, SEO, accessibility and best practices? Chrome has a built-in report for that!