fix(material/datepicker): replace aria-pressed with aria-selected on …

src/material/datepicker/calendar-body.html

@@ -33,7 +33,7 @@
     }
     <!--
       Each gridcell in the calendar contains a button, which signals to assistive technology that the
-      cell is interactable, as well as the selection state via `aria-pressed`. See #23476 for
+      cell is interactable, as well as the selection state via `aria-selected`. See #23476 for
       background.
     -->
     @for (item of row; track item.id; let colIndex = $index) {
@@ -66,7 +66,7 @@
             [class.mat-calendar-body-in-preview]="_isInPreview(item.compareValue)"
             [attr.aria-label]="item.ariaLabel"
             [attr.aria-disabled]="!item.enabled || null"
-            [attr.aria-pressed]="_isSelected(item.compareValue)"
+            [attr.aria-selected]="_isSelected(item.compareValue)"
             [attr.aria-current]="todayValue === item.compareValue ? 'date' : null"
             [attr.aria-describedby]="_getDescribedby(item.compareValue)"
             (click)="_cellClicked(item, $event)"

src/material/datepicker/calendar-body.spec.ts

@@ -88,13 +88,13 @@ describe('MatCalendarBody', () => {
       expect(selectedCell.innerHTML.trim()).toBe('4');
     });
 
-    it('should set aria-pressed correctly', () => {
-      const pressedCells = cellEls.filter(c => c.getAttribute('aria-pressed') === 'true');
-      const depressedCells = cellEls.filter(c => c.getAttribute('aria-pressed') === 'false');
+    it('should set aria-selected correctly', () => {
+      const selectedCells = cellEls.filter(c => c.getAttribute('aria-selected') === 'true');
+      const deselectedCells = cellEls.filter(c => c.getAttribute('aria-selected') === 'false');
 
-      expect(pressedCells.length).withContext('Expected one cell to be marked as pressed.').toBe(1);
-      expect(depressedCells.length)
-        .withContext('Expected remaining cells to be marked as not pressed.')
+      expect(selectedCells.length).withContext('Expected one cell to be marked as selected.').toBe(1);
+      expect(deselectedCells.length)
+        .withContext('Expected remaining cells to be marked as not selected.')
         .toBe(cellEls.length - 1);
     });
 

src/material/datepicker/testing/calendar-cell-harness.ts

@@ -69,7 +69,7 @@ export class MatCalendarCellHarness extends ComponentHarness {
   /** Whether the cell is selected. */
   async isSelected(): Promise<boolean> {
     const host = await this.host();
-    return (await host.getAttribute('aria-pressed')) === 'true';
+    return (await host.getAttribute('aria-selected')) === 'true';
   }
 
   /** Whether the cell is disabled. */