openproject/frontend/app/components/wp-buttons/wp-button.template.html

<label for="{{ ::vm.buttonId }}"
       ng-attr-accesskey="{{ ::vm.activeAccessKey }}"
       class="hidden-for-sighted">

  {{ vm.label }}
</label>
<button id="{{ ::vm.buttonId }}"
        class="button"
        title="{{ vm.label }}"
        ng-click="vm.performAction()"
        ng-disabled="vm.disabled"
        ng-class="{ '-active': vm.isActive() }">
  <i class="{{ ::vm.iconClass }} button--icon"></i>
  <span class="hidden-for-sighted">{{ vm.label }}</span>
</button>