From 84a71be8e4dde45f9b29da08ac412fafc72ce2e3 Mon Sep 17 00:00:00 2001
From: Nic <162764842+Nic-Polumeyv@users.noreply.github.com>
Date: Fri, 12 Jun 2026 19:46:10 -0400
Subject: [PATCH] breaking: remove Safari <18 overflow workaround in
 transitions

---
 .changeset/shiny-donuts-applaud.md            |  5 ++++
 .../client/dom/elements/transitions.js        | 25 +------------------
 2 files changed, 6 insertions(+), 24 deletions(-)
 create mode 100644 .changeset/shiny-donuts-applaud.md

diff --git a/.changeset/shiny-donuts-applaud.md b/.changeset/shiny-donuts-applaud.md
new file mode 100644
index 0000000000..7294e05c20
--- /dev/null
+++ b/.changeset/shiny-donuts-applaud.md
@@ -0,0 +1,5 @@
+---
+'svelte': major
+---
+
+breaking: remove Safari <18 `overflow: hidden` transition workaround
diff --git a/packages/svelte/src/internal/client/dom/elements/transitions.js b/packages/svelte/src/internal/client/dom/elements/transitions.js
index 7c4d385807..ccdf1b0245 100644
--- a/packages/svelte/src/internal/client/dom/elements/transitions.js
+++ b/packages/svelte/src/internal/client/dom/elements/transitions.js
@@ -204,13 +204,6 @@ export function transition(flags, element, get_fn, get_params) {
 
 	var inert = element.inert;
 
-	/**
-	 * The default overflow style, stashed so we can revert changes during the transition
-	 * that are necessary to work around a Safari <18 bug
-	 * TODO 6.0 remove this, if older versions of Safari have died out enough
-	 */
-	var overflow = element.style.overflow;
-
 	/** @type {Animation | undefined} */
 	var intro;
 
@@ -260,8 +253,6 @@ export function transition(flags, element, get_fn, get_params) {
 					// Ensure we cancel the animation to prevent leaking
 					intro?.abort();
 					intro = current_options = undefined;
-
-					element.style.overflow = overflow;
 				}
 			);
 		},
@@ -420,29 +411,15 @@ function animate(element, options, counterpart, t2, on_begin, on_finish) {
 		var keyframes = [];
 
 		if (duration > 0) {
-			/**
-			 * Whether or not the CSS includes `overflow: hidden`, in which case we need to
-			 * add it as an inline style to work around a Safari <18 bug
-			 * TODO 6.0 remove this, if possible
-			 */
-			var needs_overflow_hidden = false;
-
 			if (css) {
 				var n = Math.ceil(duration / (1000 / 60)); // `n` must be an integer, or we risk missing the `t2` value
 
 				for (var i = 0; i <= n; i += 1) {
 					var t = t1 + delta * easing(i / n);
-					var styles = css_to_keyframe(css(t, 1 - t));
-					keyframes.push(styles);
-
-					needs_overflow_hidden ||= styles.overflow === 'hidden';
+					keyframes.push(css_to_keyframe(css(t, 1 - t)));
 				}
 			}
 
-			if (needs_overflow_hidden) {
-				/** @type {HTMLElement} */ (element).style.overflow = 'hidden';
-			}
-
 			get_t = () => {
 				var time = /** @type {number} */ (
 					/** @type {globalThis.Animation} */ (animation).currentTime