szurubooru/client/html/post_content.tpl

<div class='post-content post-type-<%- ctx.post.type %>'>
    <% if (['image', 'animation'].includes(ctx.post.type)) { %>

        <img alt='' src='<%- ctx.post.contentUrl %>'/>

    <% } else if (ctx.post.type === 'flash') { %>

        <object width='<%- ctx.post.canvasWidth %>' height='<%- ctx.post.canvasHeight %>' data='<%- ctx.post.contentUrl %>'>
            <param name='wmode' value='opaque'/>
            <param name='movie' value='<%- ctx.post.contentUrl %>'/>
        </object>

    <% } else if (ctx.post.type === 'video') { %>

        <%= ctx.makeElement(
            'video', {
                controls: true,
                loop: (ctx.post.flags || []).includes('loop'),
                autoplay: ctx.autoplay,
            },
            ctx.makeElement('source', {
                type: ctx.post.mimeType,
                src: ctx.post.contentUrl,
            }),
            'Your browser doesn\'t support HTML5 videos.')
        %>

    <% } else { console.log(new Error('Unknown post type')); } %>

    <div class='post-overlay'>
    </div>
</div>