🎨 CSS @starting-style Generator Zero Dependencies·Offline
Free online CSS @starting-style generator. Generate CSS starting style rules for smooth transition animations from display:none to display:block. Pure frontend processing.
What can the CSS @starting-style Generator do?
The CSS @starting-style Generator is a free online tool that helps frontend developers quickly generate CSS @starting-style rule code. @starting-style is a new CSS feature for defining the initial style when an element transitions from display:none into the document flow, enabling smooth enter animations for modals, dropdowns, and more. Pure frontend processing, no server uploads.
Core Features
- Preset Animation Templates: Modal, dropdown, tooltip, notification and more one-click generation
- Custom Configuration: Freely choose transition properties, duration, easing, and direction
- allow-discrete Support: Automatically adds transition-behavior: allow-discrete for display transitions
- Live Preview: Preview animation effects directly in the page
- One-Click Export: Copy or download generated CSS code for immediate use
How to Use
- Select animation type: Choose from preset templates or select custom
- Configure selector: Enter CSS selector and show state class name
- Set transition properties: Check opacity, transform, scale properties
- Adjust parameters: Set duration, easing function, transform direction
- Generate code: Click generate and copy code to your project
Use Cases
Case 1: Modal/Dialog Animation
When a modal transitions from display:none to display:block, use @starting-style to define opacity:0 and transform starting state for a fade-in + slide-up enter animation.
Case 2: Dropdown Menu Expansion
When a dropdown expands, transition from a transparent + offset starting state to fully visible, smoother and better performing than JavaScript animations.
Case 3: Tooltip Display
When hovering, the tooltip transitions from hidden to visible with an elegant fade-in effect using @starting-style, no extra JavaScript needed.
Technical Background
CSS @starting-style is part of the CSS Transitions Level 2 specification, first implemented in Chrome 117 in 2023. It solves a long-standing CSS transition pain point: elements transitioning from display:none into the document flow cannot have transition animations applied. Traditional solutions require JavaScript to manually add classes or use requestAnimationFrame, while @starting-style makes this purely CSS. Combined with transition-behavior: allow-discrete, the display property itself can participate in transitions, enabling true "enter animations".
❓ FAQ
What is CSS @starting-style?
@starting-style is a CSS rule that defines the initial style when an element transitions from display:none into the document flow, enabling smooth animations for properties that normally cannot transition.
Why do I need @starting-style?
Traditional CSS cannot apply transition animations to elements going from display:none to display:block because there is no starting state. @starting-style provides that starting state.
What is browser compatibility?
Chrome 117+, Edge 117+, Safari 17.4+ support it. Firefox is implementing. Use @supports for detection.
Can it work with transition-behavior?
Yes. transition-behavior: allow-discrete lets display participate in transitions, and @starting-style defines the starting state. Together they enable complete enter animations.
What animation scenarios are supported?
Modal dialogs, dropdown menus, tooltips, notifications, accordions, and any hide-to-show transition animations.
How is it different from CSS animations?
@starting-style works with transitions for declarative state changes, which is simpler. CSS @keyframes animations are more flexible but require more code.