Draw the alert's dismiss button from the interaction classes

Plan step 36 ("Interaction is the shared classes", the user, 2026-09-14).
The dismiss button hand-rolled md-state-layer, md-focus-ring and
md-touch-target, and alert.css's own header said so; it now renders the
classes and keeps only its own size, offset and colour.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9

resources/css/components/alert.css

@@ -7,11 +7,9 @@
  *
  * `data-md-color`: info (the default), success, warning, error, primary, secondary, tertiary or
  * neutral (surface-container-high, on-surface — it has no state colour of its own). The dismiss
- * button is drawn at 40px, pulled 8px out into the alert's padding, and reaches M3's 48px target
- * (ACT-18) through an `::after`. Its state layer, focus ring and target are the declarations of
- * the foundation's `md-state-layer`, `md-focus-ring` and `md-touch-target`
- * (foundation/interaction.css), keyed on the button itself as button.css does, because the view
- * writes no class list.
+ * button is drawn at 40px, pulled 8px out into the alert's padding, and renders the foundation's
+ * `md-state-layer`, `md-focus-ring` and `md-touch-target` (foundation/interaction.css) to reach
+ * M3's 48px target (ACT-18); nothing here copies their rules.
  */
 
 @layer material.reset, material.tokens, material.base, material.layout, material.components, material.text, material.visibility;
@@ -95,8 +93,6 @@
     }
 
     [data-md-alert-dismiss] {
-        position: relative;
-        isolation: isolate;
         display: inline-flex;
         flex-shrink: 0;
         align-items: center;
@@ -106,49 +102,5 @@
         margin: -8px;
         border-radius: var(--md-sys-shape-corner-full);
         cursor: pointer;
-        outline: none;
-
-        &::before {
-            content: '';
-            position: absolute;
-            inset: 0;
-            z-index: -1;
-            border-radius: inherit;
-            background-color: currentColor;
-            opacity: 0;
-            pointer-events: none;
-            transition: opacity var(--md-sys-motion-effects-fast-duration) var(--md-sys-motion-effects-fast);
-        }
-
-        &::after {
-            content: '';
-            position: absolute;
-            top: 50%;
-            left: 50%;
-            width: 100%;
-            height: 100%;
-            min-width: var(--md-sys-measurement-space600);
-            min-height: var(--md-sys-measurement-space600);
-            translate: -50% -50%;
-        }
-
-        @media (hover: hover) {
-            &:hover::before {
-                opacity: var(--md-sys-state-hover-state-layer-opacity);
-            }
-        }
-
-        &:focus-visible {
-            outline: 3px solid var(--md-sys-color-secondary);
-            outline-offset: 2px;
-        }
-
-        &:focus-visible::before {
-            opacity: var(--md-sys-state-focus-state-layer-opacity);
-        }
-
-        &:active::before {
-            opacity: var(--md-sys-state-pressed-state-layer-opacity);
-        }
     }
 }

resources/views/components/alert.blade.php

@@ -15,8 +15,8 @@
      something the person just did (ACT-36). M3 publishes no banner; the nearest thing it does
      publish, the snackbar, says polite and never assertive.
 
-     Drawn by resources/css/components/alert.css from `data-md-alert` and `data-md-color`; no
-     class list. --}}
+     Drawn by resources/css/components/alert.css from `data-md-alert` and `data-md-color`; the
+     dismiss button carries only the foundation's interaction classes. --}}
 
 @props([
     'title' => null,
@@ -63,7 +63,7 @@
     </div>
 
     @if ($dismissible)
-        <button type="button" data-md-alert-dismiss aria-label="{{ __('Dismiss') }}" x-on:click="shown = false">
+        <button type="button" class="md-state-layer md-focus-ring md-touch-target" data-md-alert-dismiss aria-label="{{ __('Dismiss') }}" x-on:click="shown = false">
             <x-livewire-material::icon name="close" size="20" />
         </button>
     @endif

tests/Feature/Components/AlertTest.php

@@ -47,17 +47,17 @@ it('takes actions, drops its icon on request, and can be dismissed', function ()
         ->and(substr_count($html, '<svg'))->toBe(1);
 });
 
-it('reaches 48px from its 40px dismiss button', function () {
+it('reaches 48px from its 40px dismiss button, from the foundation\'s class, not a copy', function () {
     $css = ComponentStylesheet::read('alert');
 
     expect($css->declarations('[data-md-alert-dismiss]'))->toMatchArray([
         'width' => 'var(--md-sys-measurement-space500)',
         'height' => 'var(--md-sys-measurement-space500)',
     ])
-        ->and($css->declarations('[data-md-alert-dismiss]::after'))->toMatchArray([
-            'min-width' => 'var(--md-sys-measurement-space600)',
-            'min-height' => 'var(--md-sys-measurement-space600)',
-        ]);
+        ->and($css->has('[data-md-alert-dismiss]::after'))->toBeFalse()
+        ->and($css->has('[data-md-alert-dismiss]::before'))->toBeFalse()
+        ->and((string) $this->blade('<x-alert description="Draft." dismissible />'))
+        ->toMatch('/class="md-state-layer md-focus-ring md-touch-target" data-md-alert-dismiss/');
 });
 
 it('draws neutral in surface-container-high, on-surface', function () {