Ghost/core/server/apps/default-cards/cards/markdown.js

module.exports = {
        name: 'card-markdown',
        type: 'dom',
        render: function (opts) {
            var markdownConverter = require('../../../utils/markdown-converter'),
                html, element;

            // convert markdown to HTML ready for insertion into dom
            html = '<div class="kg-card-markdown">'
                + markdownConverter.render(opts.payload.markdown || '')
                + '</div>';

            // use the SimpleDOM document to create a raw HTML section.
            // avoids parsing/rendering of potentially broken or unsupported HTML
            element = opts.env.dom.createRawHTMLSection(html);

            return element;
        }
    };