--- title: In-N-Out Animation using sibling-index() – Master.dev Blog description: A CSS-only technique for creating in-and-out animations using the `sibling-index()` function. When DOM elements are added or removed, their sibling indexes... canonical: https://daily.dev/posts/in-n-out-animation-using-sibling-index-master-dev-blog-gpabdpeo1 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: In-N-Out Animation using sibling-index() – Master.dev Blog | daily.dev og:description: A CSS-only technique for creating in-and-out animations using the `sibling-index()` function. When DOM elements are added or removed, their sibling indexes... og:url: https://daily.dev/posts/in-n-out-animation-using-sibling-index-master-dev-blog-gpabdpeo1 og:image: https://api.daily.dev/og/posts/GpABDPeO1.png og:image:alt: In-N-Out Animation using sibling-index() – Master.dev Blog og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # In-N-Out Animation using sibling-index() – Master.dev Blog **[Frontend Masters](https://daily.dev/sources/frontendmasters)** · 7 min read · 9 upvotes · 0 comments ## Summary A CSS-only technique for creating in-and-out animations using the `sibling-index()` function. When DOM elements are added or removed, their sibling indexes update, causing translated positions to recalculate and triggering smooth CSS transitions. Combined with `@starting-style` for entry animations, the entire effect requires fewer than 10 lines of CSS. The post covers the core technique, practical demos (avatar lists, circular layouts, responsive grids), and honest drawbacks: out-of-flow content, fixed item sizing requirements, and no native exit animation equivalent. Currently supported only in Chrome and Edge. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [In-N-Out Animations: View Transitions \(Part 3/3\) – Master.dev Blog](https://daily.dev/posts/in-n-out-animations-view-transitions-part-3-3-master-dev-blog-pg7ta5epy) · Frontend Masters · 9 upvotes · 0 comments - [In-N-Out Animations: Dialogs \(Part 1/3\) – Frontend Masters Blog](https://daily.dev/posts/in-n-out-animations-dialogs-part-1-3-frontend-masters-blog-yro2ic97o) · Frontend Masters · 4 upvotes · 0 comments - [In-N-Out Animations: Popovers \(Part 2/3\) – Master.dev Blog](https://daily.dev/posts/in-n-out-animations-popovers-part-2-3-master-dev-blog-vgzaenwev) · Frontend Masters · 10 upvotes · 0 comments - [Staggered Animation with CSS sibling-\* Functions – Frontend Masters Blog](https://daily.dev/posts/staggered-animation-with-css-sibling--functions-frontend-masters-blog-o9x9nobox) · Frontend Masters · 0 upvotes · 0 comments - [How to create awesome staggered animations in CSS](https://daily.dev/posts/how-to-create-awesome-staggered-animations-in-css-k09m57ftt) · LogRocket · 52 upvotes · 2 comments --- Tags: [#css](https://daily.dev/tags/css) [View this post on daily.dev](https://daily.dev/posts/in-n-out-animation-using-sibling-index-master-dev-blog-gpabdpeo1) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"In-N-Out Animation using sibling-index() – Master.dev Blog","url":"https://daily.dev/posts/in-n-out-animation-using-sibling-index-master-dev-blog-gpabdpeo1","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/in-n-out-animation-using-sibling-index-master-dev-blog-gpabdpeo1"},"datePublished":"2026-07-13T17:38:37.269Z","dateModified":"2026-07-13T17:39:00.382Z","description":"A CSS-only technique for creating in-and-out animations using the `sibling-index()` function. 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