Ghost/ghost/admin/app/components/gh-browser-preview.hbs

<div class="gh-browserpreview-previewcontainer" ...attributes>
    <div class="gh-browserpreview-browser">
        <div class="tabs">
            <ul><li></li><li></li><li></li></ul>
            <div>
                {{#if @icon}}
                    <span class="favicon"><img src={{@icon}} alt="icon"></span>
                {{else}}
                    <span class="favicon default">{{svg-jar "default-favicon"}}</span>
                {{/if}}
                <span class="site-title">{{@title}}</span>
            </div>
        </div>
    </div>
    <div class="gh-browserpreview-iframecontainer">
        {{yield}}
    </div>
</div>