SVG Entry Animation with @starting-style
@starting-style defines an element's starting values for a transition when it first appears, enabling native CSS-only entry animations.
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The Problem @starting-style Solves
CSS transitions normally only animate between two states of an already-rendered element, meaning a newly appearing SVG element (like a popover or a conditionally rendered icon) can't transition smoothly from a start state on its very first appearance without @starting-style explicitly defining what that starting state should be.
- Standard transitions can't animate an element's very first appearance in the DOM
- @starting-style explicitly defines the starting values for that first-appearance transition
- Solves smooth entry animation for newly appearing or newly displayed SVG elements
Using @starting-style for SVG Popover and Modal Entry
Combining @starting-style with the display and transition properties lets an SVG icon inside a newly opened popover or modal fade and scale in smoothly on its first appearance, a pattern that previously required JavaScript to add a class one frame after the element mounted to trigger the transition correctly.
- Enables smooth fade and scale entry animations for newly opened elements
- Previously required a JavaScript-driven class toggle one frame after mounting
- Works particularly well combined with the native Popover API and dialog elements
Frequently Asked Questions
Does @starting-style work for elements that were already in the DOM but hidden?
Yes, it applies whenever an element transitions from not being rendered (display: none or not yet in the DOM) to being rendered, which covers both newly mounted elements and previously hidden ones becoming visible.
Is @starting-style support solid enough for production use yet?
Support is newer than many other CSS features covered here, so checking current browser support tables against your specific target audience is especially worthwhile before relying on it without a fallback.
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