PortableInfobox/templates/PortableInfoboxItemImageMobile.mustache

<div class="pi-item pi-image">
	<figure class="article-media-thumbnail" data-component="article-media-thumbnail" data-attrs="{{mercuryComponentAttrs}}">
		<a href="{{url}}">
			<img class="article-media-placeholder"
				src="data:image/svg+xml;charset=utf-8,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' viewBox%3D'0 0 {{width}} {{height}}'%2F%3E"
				alt="{{title}}"
				{{#width}} width="{{width}}"{{/width}}
				{{#height}} height="{{height}}"{{/height}}>
			<noscript>
				<img src="{{url}}" alt="{{alt}}"{{#width}} width="{{width}}"{{/width}}{{#height}} height="{{height}}"{{/height}}>
			</noscript>
		</a>
	</figure>
</div>