CSS Starting Style Transition Builder
Build @starting-style transitions for newly inserted dialogs, cards, and popovers.
What the CSS Starting Style Transition does
Build @starting-style transitions for newly inserted dialogs, cards, and popovers. A modal can fade from opacity zero when it first appears instead of snapping into place 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: Starting styles are progressive enhancement and need non-animated defaults.
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 Starting Style Transition do?
Build @starting-style transitions for newly inserted dialogs, cards, and popovers. A modal can fade from opacity zero when it first appears instead of snapping into place.
What should I keep in mind?
Starting styles are progressive enhancement and need non-animated defaults
Does it upload my input?
No. The CSS Starting Style Transition 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.