button-toggle.html

<button #button class="mat-button-toggle-button mat-focus-indicator"
        type="button"
        [id]="buttonId"
        [attr.role]="isSingleSelector() ? 'radio' : 'button'"
        [attr.tabindex]="disabled && !disabledInteractive ? -1 : tabIndex"
        [attr.aria-pressed]="!isSingleSelector() ? checked : null"
        [attr.aria-checked]="isSingleSelector() ? checked : null"
        [disabled]="(disabled && !disabledInteractive) || null"
        [attr.name]="_getButtonName()"
        [attr.aria-label]="ariaLabel"
        [attr.aria-labelledby]="ariaLabelledby"
        [attr.aria-disabled]="disabled && disabledInteractive ? 'true' : null"
        (click)="_onButtonClick()">
  @if (buttonToggleGroup && (
    !buttonToggleGroup.multiple && !buttonToggleGroup.hideSingleSelectionIndicator ||
    buttonToggleGroup.multiple && !buttonToggleGroup.hideMultipleSelectionIndicator)
  ) {
    <div class="mat-button-toggle-checkbox-wrapper">
      <mat-pseudo-checkbox
        [disabled]="disabled"
        state="checked"
        aria-hidden="true"
        appearance="minimal"/>
    </div>
  }

  <span class="mat-button-toggle-label-content">
    <ng-content></ng-content>
  </span>
</button>

<span class="mat-button-toggle-focus-overlay"></span>
<span class="mat-button-toggle-ripple" matRipple
     [matRippleTrigger]="button"
     [matRippleDisabled]="this.disableRipple || this.disabled">
</span>