diff --git a/src/uix/morfo/components/css-field.ts b/src/uix/morfo/components/css-field.ts
index 68b2a984e..3cd03085e 100644
--- a/src/uix/morfo/components/css-field.ts
+++ b/src/uix/morfo/components/css-field.ts
@@ -158,9 +158,9 @@ export const cssFieldMorfo = {
 				},
 				{
 					attr: 'aria-disabled',
-					value: v.literal('true'),
+					value: v.propRef('disabled'),
 					severity: 'optional',
-					condition: { when: 'prop-truthy', prop: 'disabled' }
+					ariaBoolean: true
 				}
 			]
 		},
@@ -185,9 +185,9 @@ export const cssFieldMorfo = {
 				},
 				{
 					attr: 'aria-disabled',
-					value: v.literal('true'),
+					value: v.propRef('disabled'),
 					severity: 'optional',
-					condition: { when: 'prop-truthy', prop: 'disabled' }
+					ariaBoolean: true
 				}
 			]
 		},
diff --git a/src/uix/morfo/components/number-field.ts b/src/uix/morfo/components/number-field.ts
index 5691063b6..03c505a4a 100644
--- a/src/uix/morfo/components/number-field.ts
+++ b/src/uix/morfo/components/number-field.ts
@@ -150,9 +150,9 @@ export const numberFieldMorfo = {
 				},
 				{
 					attr: 'aria-disabled',
-					value: v.literal('true'),
+					value: v.propRef('disabled'),
 					severity: 'optional',
-					condition: { when: 'prop-truthy', prop: 'disabled' }
+					ariaBoolean: true
 				}
 			]
 		},
@@ -177,9 +177,9 @@ export const numberFieldMorfo = {
 				},
 				{
 					attr: 'aria-disabled',
-					value: v.literal('true'),
+					value: v.propRef('disabled'),
 					severity: 'optional',
-					condition: { when: 'prop-truthy', prop: 'disabled' }
+					ariaBoolean: true
 				}
 			]
 		},
diff --git a/src/uix/soma/components/css-field/css-field-provider.svelte.ts b/src/uix/soma/components/css-field/css-field-provider.svelte.ts
index 8a4de984e..cf4901569 100644
--- a/src/uix/soma/components/css-field/css-field-provider.svelte.ts
+++ b/src/uix/soma/components/css-field/css-field-provider.svelte.ts
@@ -1,6 +1,6 @@
 import { watch } from 'runed';
 import { context, type WithRefOpts } from '../../provider';
-import { boolToEmptyStrOrUndef, boolToStr, isHTMLElement } from '$adom';
+import { boolToEmptyStrOrUndef, isHTMLElement } from '$adom';
 import { readableActive, type Active, type ActiveProps, type StateProps } from '$libs/reactive';
 import type {
 	OnChangeFn,
@@ -586,7 +586,9 @@ export class CssFieldIncrementTriggerProvider {
 		this.runtimePart = this.provider.runtime.part('increment-trigger', {
 			id: opts.id,
 			ref: opts.ref,
-			owner: this
+			owner: this,
+			// trigger-local disabled (includes atMax) → renderProps resolves aria-disabled
+			props: { disabled: () => this.isDisabled }
 		});
 	}
 
@@ -609,13 +611,10 @@ export class CssFieldIncrementTriggerProvider {
 
 	readonly props = $derived.by(() =>
 		this.runtimePart.assert({
-			...this.runtimePart.props,
-			type: 'button' as const,
+			// type, aria-label, data-spin-field, aria-disabled are morfo-declared.
+			...this.runtimePart.renderProps(),
 			tabindex: -1,
 			disabled: this.isDisabled || undefined,
-			'aria-label': this.provider.soma.langs.ts(CSS_FIELD_LANGS.INCREMENT),
-			'data-spin-field-increment-trigger': '',
-			'aria-disabled': boolToStr(this.isDisabled),
 			'data-disabled': boolToEmptyStrOrUndef(this.isDisabled),
 			onclick: this.handleClick,
 			onpointerdown: this.handlePointerDown,
@@ -653,7 +652,9 @@ export class CssFieldDecrementTriggerProvider {
 		this.runtimePart = this.provider.runtime.part('decrement-trigger', {
 			id: opts.id,
 			ref: opts.ref,
-			owner: this
+			owner: this,
+			// trigger-local disabled (includes atMin) → renderProps resolves aria-disabled
+			props: { disabled: () => this.isDisabled }
 		});
 	}
 
@@ -676,13 +677,10 @@ export class CssFieldDecrementTriggerProvider {
 
 	readonly props = $derived.by(() =>
 		this.runtimePart.assert({
-			...this.runtimePart.props,
-			type: 'button' as const,
+			// type, aria-label, data-spin-field, aria-disabled are morfo-declared.
+			...this.runtimePart.renderProps(),
 			tabindex: -1,
 			disabled: this.isDisabled || undefined,
-			'aria-label': this.provider.soma.langs.ts(CSS_FIELD_LANGS.DECREMENT),
-			'data-spin-field-decrement-trigger': '',
-			'aria-disabled': boolToStr(this.isDisabled),
 			'data-disabled': boolToEmptyStrOrUndef(this.isDisabled),
 			onclick: this.handleClick,
 			onpointerdown: this.handlePointerDown,
@@ -810,10 +808,8 @@ export class CssFieldScrubberProvider {
 
 	readonly props = $derived.by(() =>
 		this.runtimePart.assert({
-			...this.runtimePart.props,
-			role: 'presentation' as const,
-			'aria-hidden': true as const,
-			'data-spin-field-scrubber': '',
+			// role, aria-hidden, data-spin-field-scrubber are morfo-declared.
+			...this.runtimePart.renderProps(),
 			'data-scrubbing': boolToEmptyStrOrUndef(this.provider.scrubbing),
 			'data-disabled': boolToEmptyStrOrUndef(this.isDisabled),
 			style: {
diff --git a/src/uix/soma/components/number-field/number-field-provider.svelte.ts b/src/uix/soma/components/number-field/number-field-provider.svelte.ts
index cde5fa552..384414adb 100644
--- a/src/uix/soma/components/number-field/number-field-provider.svelte.ts
+++ b/src/uix/soma/components/number-field/number-field-provider.svelte.ts
@@ -1,6 +1,6 @@
 import { watch } from 'runed';
 import { context, type WithRefOpts } from '../../provider';
-import { boolToEmptyStrOrUndef, boolToStr, isHTMLElement } from '$adom';
+import { boolToEmptyStrOrUndef, isHTMLElement } from '$adom';
 import { readableActive, type Active, type ActiveProps, type StateProps } from '$libs/reactive';
 import type {
 	OnChangeFn,
@@ -11,7 +11,6 @@ import type {
 } from '../../types';
 import { KEYS } from '../../keyboard';
 import { Soma } from '../../core/soma.svelte';
-import { NUMBER_FIELD_LANGS } from './langs';
 import { FieldProvider } from '../field';
 
 // ── Intl fallback cache ──────────────────────────────────────────────────────
@@ -660,7 +659,9 @@ export class NumberFieldIncrementTriggerProvider {
 		this.runtimePart = this.provider.runtime.part('increment-trigger', {
 			id: opts.id,
 			ref: opts.ref,
-			owner: this
+			owner: this,
+			// trigger-local disabled (includes atMax) → renderProps resolves aria-disabled
+			props: { disabled: () => this.isDisabled }
 		});
 	}
 
@@ -683,13 +684,10 @@ export class NumberFieldIncrementTriggerProvider {
 
 	readonly props = $derived.by(() =>
 		this.runtimePart.assert({
-			...this.runtimePart.props,
-			type: 'button' as const,
+			// type, aria-label, data-spin-field, aria-disabled are morfo-declared.
+			...this.runtimePart.renderProps(),
 			tabindex: -1,
 			disabled: this.isDisabled || undefined,
-			'aria-label': this.provider.soma.langs.ts(NUMBER_FIELD_LANGS.INCREMENT),
-			'data-spin-field-increment-trigger': '',
-			'aria-disabled': boolToStr(this.isDisabled),
 			'data-disabled': boolToEmptyStrOrUndef(this.isDisabled),
 			onclick: this.handleClick,
 			onpointerdown: this.handlePointerDown,
@@ -727,7 +725,9 @@ export class NumberFieldDecrementTriggerProvider {
 		this.runtimePart = this.provider.runtime.part('decrement-trigger', {
 			id: opts.id,
 			ref: opts.ref,
-			owner: this
+			owner: this,
+			// trigger-local disabled (includes atMin) → renderProps resolves aria-disabled
+			props: { disabled: () => this.isDisabled }
 		});
 	}
 
@@ -750,13 +750,10 @@ export class NumberFieldDecrementTriggerProvider {
 
 	readonly props = $derived.by(() =>
 		this.runtimePart.assert({
-			...this.runtimePart.props,
-			type: 'button' as const,
+			// type, aria-label, data-spin-field, aria-disabled are morfo-declared.
+			...this.runtimePart.renderProps(),
 			tabindex: -1,
 			disabled: this.isDisabled || undefined,
-			'aria-label': this.provider.soma.langs.ts(NUMBER_FIELD_LANGS.DECREMENT),
-			'data-spin-field-decrement-trigger': '',
-			'aria-disabled': boolToStr(this.isDisabled),
 			'data-disabled': boolToEmptyStrOrUndef(this.isDisabled),
 			onclick: this.handleClick,
 			onpointerdown: this.handlePointerDown,
@@ -889,10 +886,8 @@ export class NumberFieldScrubberProvider {
 
 	readonly props = $derived.by(() =>
 		this.runtimePart.assert({
-			...this.runtimePart.props,
-			role: 'presentation' as const,
-			'aria-hidden': true as const,
-			'data-spin-field-scrubber': '',
+			// role, aria-hidden, data-spin-field-scrubber are morfo-declared.
+			...this.runtimePart.renderProps(),
 			'data-scrubbing': boolToEmptyStrOrUndef(this.provider.scrubbing),
 			'data-disabled': boolToEmptyStrOrUndef(this.isDisabled),
 			style: {