Bookmarklet to pin to Pinterest from an Instagram web page

pinstagram.js

(
  function() {
    function getSrcUri() {
      return window.location;
    }

    function getSrc() {
      return document.getElementsByClassName('lfFrame')[0].getAttribute('src');
    }

    function getPoster() {
      var el = document.getElementsByClassName('lfFrame')[0];
      return el.getAttribute('poster') || el.getAttribute('src');
    }

    function getDescription() {
      return document.getElementsByTagName("h1")[0].innerText;
    }

    function getPinUrl() {
      return "//www.pinterest.com/pin/create/button/?url=" + encodeURIComponent(getSrcUri())
      + "&media=" + encodeURIComponent(getPoster());
      + "&description=" + encodeURIComponent(getDescription());
    }

    window.location = getPinUrl();
  }
)();