CSS Supports Query Builder
@supports asks the browser whether it understands a property and value pair before applying a block of CSS.
What the CSS Supports Query does
@supports asks the browser whether it understands a property and value pair before applying a block of CSS. Adjust the controls and the preview updates immediately, so you can dial in exactly what you want and copy the result straight into your project — no build step and no account.
One thing to keep in mind: Use @supports not for fallback styles when a newer feature such as subgrid, backdrop-filter, or text-wrap is unavailable.
Private and in your browser
Everything runs locally in your browser. Your input is never uploaded, so the tool stays fast and works offline, and the copy and download buttons always use the current result shown in the output panel.
Frequently Asked Questions
What does the CSS Supports Query do?
@supports asks the browser whether it understands a property and value pair before applying a block of CSS.
What should I keep in mind?
Use @supports not for fallback styles when a newer feature such as subgrid, backdrop-filter, or text-wrap is unavailable
Does it upload my input?
No. The CSS Supports Query runs entirely in your browser — your input is never uploaded, and it keeps working offline once the page has loaded.
Practical utilities for front-end design and implementation work.