ohif-viewer/Packages/viewerbase/client/components/studyBrowser/imageThumbnail/imageThumbnail.html

<template name="imageThumbnail">
    <div class="imageThumbnail">
        <div class="imageThumbnailCanvas"></div>
        <div class="imageThumbnailLoadingIndicator thumbnailLoadingIndicator">
            <p>Loading {{percentComplete}}</p>
        </div>
        <div class="imageThumbnailErrorLoadingIndicator thumbnailLoadingIndicator">
            <p>Error</p>
        </div>
    </div>
</template>