diff --git a/src/uix/morfo/components/feed.ts b/src/uix/morfo/components/feed.ts
index 8b63cbc00..77b171827 100644
--- a/src/uix/morfo/components/feed.ts
+++ b/src/uix/morfo/components/feed.ts
@@ -18,13 +18,19 @@ export const feedMorfo = {
 			defaultElement: 'section',
 			role: 'feed',
 			optional: false,
-			data: [{ attr: 'data-busy', severity: 'optional' }],
+			data: [{ attr: 'data-busy', value: v.propRef('busy'), severity: 'optional' }],
 			aria: [
 				{
 					attr: 'aria-label',
-					value: v.translationRef('#?components.feed.label|Feed'),
+					value: v.propRef('ariaLabel'),
 					severity: 'recommended'
 				},
+				{
+					attr: 'aria-labelledby',
+					value: v.propRef('ariaLabelledby'),
+					condition: { when: 'prop-truthy', prop: 'ariaLabelledby' },
+					severity: 'optional'
+				},
 				{
 					attr: 'aria-busy',
 					value: v.literal('true'),
@@ -48,8 +54,8 @@ export const feedMorfo = {
 			role: 'article',
 			optional: false,
 			data: [
-				{ attr: 'data-posinset' },
-				{ attr: 'data-level' }
+				{ attr: 'data-posinset', value: v.propRef('posinset'), emit: 'value' },
+				{ attr: 'data-level', value: v.propRef('level'), emit: 'value' }
 			],
 			aria: [
 				{ attr: 'aria-posinset', value: v.propRef('posinset') },
@@ -96,7 +102,7 @@ export const feedMorfo = {
 			defaultElement: 'div',
 			role: 'feed',
 			optional: true,
-			data: [{ attr: 'data-level' }],
+			data: [{ attr: 'data-level', value: v.propRef('level'), emit: 'value' }],
 			aria: [
 				{
 					attr: 'aria-labelledby',
@@ -112,7 +118,9 @@ export const feedMorfo = {
 			kind: 'public',
 			defaultElement: 'div',
 			optional: true,
-			data: [{ attr: 'data-intersecting', severity: 'optional' }],
+			data: [
+				{ attr: 'data-intersecting', value: v.propRef('intersecting'), severity: 'optional' }
+			],
 			aria: [{ attr: 'aria-hidden', value: v.literal('true') }]
 		}
 	]
diff --git a/src/uix/soma/components/feed/feed-provider.svelte.ts b/src/uix/soma/components/feed/feed-provider.svelte.ts
index fe20fad22..5ea7b1de2 100644
--- a/src/uix/soma/components/feed/feed-provider.svelte.ts
+++ b/src/uix/soma/components/feed/feed-provider.svelte.ts
@@ -1,6 +1,5 @@
 import { context, type WithRefOpts } from '../../provider';
 import { createAttrs } from '$uix/morfo';
-import { boolToEmptyStrOrUndef } from '$adom';
 import { readableActive, state, type Active, type ActiveProps } from '$libs/reactive';
 import type { SomaKeyboardEvent } from '../../types';
 import { KEYS } from '../../keyboard';
@@ -45,12 +44,19 @@ export class FeedProvider {
 	private constructor(opts: FeedOpts) {
 		this.opts = opts;
 		this.soma = Soma.require();
-		this.runtime = this.soma.runtime(feedMorfo, {});
+		this.runtime = this.soma.runtime(feedMorfo, {
+			props: {
+				busy: () => this.opts.busy.current,
+				ariaLabel: () => this.resolvedAriaLabel.current,
+				ariaLabelledby: () => this.opts.ariaLabelledby.current
+			}
+		});
 		this.runtimePart = this.runtime.part('provider', {
 			id: opts.id,
 			ref: opts.ref,
 			owner: this,
-			context: FeedProvider.ctx
+			context: FeedProvider.ctx,
+			syncAttrs: true
 		});
 	}
 
@@ -132,12 +138,7 @@ export class FeedProvider {
 
 	readonly props = $derived.by(() =>
 		this.runtimePart.assert({
-			...this.runtimePart.props,
-			role: 'feed' as const,
-			'aria-label': this.resolvedAriaLabel.current,
-			'aria-labelledby': this.opts.ariaLabelledby.current,
-			'aria-busy': this.opts.busy.current ? true : undefined,
-			'data-busy': boolToEmptyStrOrUndef(this.opts.busy.current)
+			...this.runtimePart.props
 		} as const)
 	);
 }
@@ -176,17 +177,21 @@ export class FeedThreadProvider {
 			id: opts.id,
 			ref: opts.ref,
 			owner: this,
-			context: FeedThreadProvider.ctx
+			context: FeedThreadProvider.ctx,
+			props: {
+				level: () => this.level
+			},
+			parts: {
+				'article-title': () => this.parentArticle.titleId.current || undefined
+			},
+			syncAttrs: true
 		});
 		this.level = this.parentArticle.level + 1;
 	}
 
 	readonly props = $derived.by(() =>
 		this.runtimePart.assert({
-			...this.runtimePart.props,
-			role: 'feed' as const,
-			'aria-labelledby': this.parentArticle.titleId.current || undefined,
-			'data-level': this.level
+			...this.runtimePart.props
 		} as const)
 	);
 }
@@ -227,7 +232,17 @@ export class FeedArticleProvider {
 			id: opts.id,
 			ref: opts.ref,
 			owner: this,
-			context: FeedArticleProvider.ctx
+			context: FeedArticleProvider.ctx,
+			props: {
+				posinset: () => this.resolvedPosinset,
+				setsize: () => this.resolvedSetsize,
+				level: () => this.level
+			},
+			parts: {
+				'article-title': () => this.titleId.current || undefined,
+				'article-description': () => this.descriptionId.current || undefined
+			},
+			syncAttrs: true
 		});
 		this.level = this.thread ? this.thread.level : 1;
 	}
@@ -275,21 +290,13 @@ export class FeedArticleProvider {
 		this.provider.handleArticleKeydown(e as SomaKeyboardEvent<HTMLElement>);
 	};
 
-	readonly props = $derived.by(() => {
-		const posinset = this.resolvedPosinset;
-		return this.runtimePart.assert({
+	readonly props = $derived.by(() =>
+		this.runtimePart.assert({
 			...this.runtimePart.props,
-			role: 'article' as const,
 			tabindex: 0,
-			'aria-posinset': posinset,
-			'aria-setsize': this.resolvedSetsize,
-			'aria-labelledby': this.titleId.current || undefined,
-			'aria-describedby': this.descriptionId.current || undefined,
-			'data-posinset': posinset,
-			'data-level': this.level,
 			onkeydown: this.onkeydown
-		} as const);
-	});
+		} as const)
+	);
 }
 
 // ── ArticleTitle ───────────────────────────────────────────────────────────
@@ -311,7 +318,11 @@ export class FeedArticleTitleProvider {
 		this.runtimePart = this.article.provider.runtime.part('article-title', {
 			id: opts.id,
 			ref: opts.ref,
-			owner: this
+			owner: this,
+			props: {
+				level: () => this.resolvedLevel
+			},
+			syncAttrs: true
 		});
 		// A30: direct assignment.
 		this.article.titleId.current = opts.id.current;
@@ -330,9 +341,7 @@ export class FeedArticleTitleProvider {
 
 	readonly props = $derived.by(() =>
 		this.runtimePart.assert({
-			...this.runtimePart.props,
-			role: 'heading' as const,
-			'aria-level': this.resolvedLevel
+			...this.runtimePart.props
 		} as const)
 	);
 }
@@ -404,7 +413,15 @@ export class FeedSentinelProvider {
 		this.soma = Soma.require();
 		this.feed = FeedProvider.get();
 		this.runtime = this.feed?.runtime ?? this.soma.runtime(feedMorfo, {});
-		this.runtimePart = this.runtime.part('sentinel', { id: opts.id, ref: opts.ref, owner: this });
+		this.runtimePart = this.runtime.part('sentinel', {
+			id: opts.id,
+			ref: opts.ref,
+			owner: this,
+			props: {
+				intersecting: () => this.intersecting
+			},
+			syncAttrs: true
+		});
 
 		$effect(() => {
 			const el = opts.ref.current;
@@ -438,9 +455,7 @@ export class FeedSentinelProvider {
 
 	readonly props = $derived.by(() =>
 		this.runtimePart.assert({
-			...this.runtimePart.props,
-			'aria-hidden': true as const,
-			'data-intersecting': boolToEmptyStrOrUndef(this.intersecting)
+			...this.runtimePart.props
 		} as const)
 	);
 }