function recirc(selection) {
  selection.each(function(data) {

    d3.select(this).selectAll("div.recirc")
      .data(data)
      .enter()
      .append("div.recirc")
      .each(render)
      .on("click", function(d) { window.location.href = d.url; });

  });

  function render(d,i) {

    var recirc = d3.select(this);

    recirc.append("div.title");
    recirc.append("div.source");
    recirc.append("iframe");

    fetch(d.src)
      .then(
        function(response) {

          response.text().then(function(rText) {

            // get page title
            var titleStart = rText.indexOf("<title>") + "<title>".length;
            var titleEnd = rText.indexOf("</title>");
            var titleLength = titleEnd - titleStart;
            var title = rText.substr(titleStart, titleLength);
            recirc.select(".title").text(title);

            // get the source between <article...> and </article>
            var start = rText.indexOf("<article");
            var end = rText.indexOf("</article>") + "</article>".length;
            var length = end - start;
            var source = rText.substr(start,length);

            var progress = 0;
            var iframeDocument = recirc.select("iframe").node().contentWindow.document;

            var renderingInterval = setInterval(function() {
              // increment within bounds
              progress=Math.min(progress + 5, source.length)

              // add some text
              recirc.select(".source").text(source.substr(0,progress));
              // scroll to bottom
              recirc.select(".source").node().scrollTop = recirc.select(".source").node().scrollHeight;

              iframeDocument.open();
              iframeDocument.write(source.substr(0,progress));
              iframeDocument.close();
              iframeDocument.getElementsByTagName("body")[0].scrollTop = iframeDocument.getElementsByTagName("body")[0].scrollHeight;

              if(progress === source.length) clearInterval(renderingInterval);
            })
          })
        }
      );
  }

}