{#if site.data.containsKey('icon')}
{#let icon=site.data.getString('icon')}
{/let}
{#else if site.data.containsKey('favicon')}
{#let icon=site.data.getString('favicon')}
{/let}
{#else if site.imageExists('favicon.ico')}
{#else if site.imageExists('favicon.svg')}
{#else if site.imageExists('favicon.png')}
{#else if site.imageExists('site-icon.svg')}
{/if}