loading.html

<svg id="loading" viewBox="0 0 32 32" ng-attr-width="{{width}}" ng-attr-height="{height}}" fill="currentcolor">
    <path opacity=".25" d="M16 0 A16 16 0 0 0 16 32 A16 16 0 0 0 16 0 M16 4 A12 12 0 0 1 16 28 A12 12 0 0 1 16 4"/>
    <path d="M16 0 A16 16 0 0 1 32 16 L28 16 A12 12 0 0 0 16 4z">
        <animateTransform attributeName="transform" type="rotate" from="0 16 16" to="360 16 16" dur="0.8s" repeatCount="indefinite" />
    </path>
</svg>