fix

packages/svelte/src/internal/client/transitions.js

@@ -269,7 +269,7 @@ export function bind_transition(element, get_fn, get_params, direction, global)
 			if (current_animation && current_options) {
 				const time = /** @type {number} */ (current_animation.currentTime);
 				const duration = /** @type {number} */ (current_options.duration);
-				p = (current_delta * time) / duration;
+				p = (Math.abs(current_delta) * time) / duration;
 				current_animation.cancel();
 			}
 
@@ -289,7 +289,8 @@ export function bind_transition(element, get_fn, get_params, direction, global)
 				current_delta = target - p;
 
 				for (let i = 0; i <= n; i += 1) {
-					const t = (current_options.easing ?? linear)(p + (current_delta * i) / n);
+					const eased = (current_options.easing ?? linear)(i / n);
+					const t = p + current_delta * eased;
 					const css = current_options.css(t, 1 - t);
 					keyframes.push(css_to_keyframe(css));
 				}

packages/svelte/tests/animation-helpers.js

@@ -73,6 +73,7 @@ class Animation {
 		}
 
 		this.#cancelled();
+		raf.animations.delete(this);
 	}
 
 	_update() {

packages/svelte/tests/runtime-legacy/samples/class-shortcut-with-transition/_config.js

@@ -18,8 +18,9 @@ export default test({
 		raf.tick(150);
 		assert.htmlEqual(
 			target.innerHTML,
-			'<p>foo</p><p class="red svelte-1yszte8 border" style="overflow: hidden; opacity: 0; border-top-width: 0.5000600024000317px; border-bottom-width: 0.5000600024000317px;">bar</p>'
+			'<p>foo</p><p class="red svelte-1yszte8 border" style="overflow: hidden; opacity: 0; border-top-width: 0.5px; border-bottom-width: 0.5px;">bar</p>'
 		);
+
 		component.open = true;
 		raf.tick(250);
 		assert.htmlEqual(