diff --git a/js/legacy/markdown-it-checkbox.js b/js/legacy/markdown-it-checkbox.js
new file mode 100644
index 000000000..3f195748d
--- /dev/null
+++ b/js/legacy/markdown-it-checkbox.js
@@ -0,0 +1,110 @@
+var _, checkboxReplace;
+
+_ = require('underscore');
+
+checkboxReplace = function(md, options, Token) {
+  "use strict";
+  var arrayReplaceAt, createTokens, defaults, lastId, pattern, splitTextToken;
+  arrayReplaceAt = md.utils.arrayReplaceAt;
+  lastId = 0;
+  defaults = {
+    divWrap: false,
+    divClass: 'checkbox',
+    idPrefix: 'checkbox'
+  };
+  options = _.extend(defaults, options);
+  pattern = /\[(X|\s|\_|\-)\]\s(.*)/i;
+  createTokens = function(checked, label, Token) {
+    var id, idNumeric, nodes, token;
+    nodes = [];
+
+    /**
+     * <div class="checkbox">
+     */
+    if (options.divWrap) {
+      token = new Token("checkbox_open", "div", 1);
+      token.attrs = [["class", options.divClass]];
+      nodes.push(token);
+    }
+
+    /**
+     * <input type="checkbox" id="checkbox{n}" checked="true">
+     */
+    id = options.idPrefix + lastId;
+    idNumeric = lastId;
+    lastId += 1;
+    token = new Token("checkbox_input", "input", 0);
+    token.attrs = [["type", "checkbox"], ["id", id], ["data-id", idNumeric]];
+    if (checked === true) {
+      token.attrs.push(["checked", "true"]);
+    }
+    nodes.push(token);
+
+    /**
+     * <label for="checkbox{n}">
+     */
+    token = new Token("label_open", "label", 1);
+    token.attrs = [["for", id], ["data-id", idNumeric]];
+    nodes.push(token);
+
+    /**
+     * content of label tag
+     */
+    token = new Token("text", "", 0);
+    token.content = label;
+    nodes.push(token);
+
+    /**
+     * closing tags
+     */
+    nodes.push(new Token("label_close", "label", -1));
+    if (options.divWrap) {
+      nodes.push(new Token("checkbox_close", "div", -1));
+    }
+    return nodes;
+  };
+  splitTextToken = function(original, Token) {
+    var checked, label, matches, text, value;
+    text = original.content;
+    matches = text.match(pattern);
+    if (matches === null) {
+      return original;
+    }
+    checked = false;
+    value = matches[1];
+    label = matches[2];
+    if (value === "X" || value === "x") {
+      checked = true;
+    }
+    return createTokens(checked, label, Token);
+  };
+  return function(state) {
+    lastId = 0;
+	var blockTokens, i, j, l, token, tokens;
+    blockTokens = state.tokens;
+    j = 0;
+    l = blockTokens.length;
+    while (j < l) {
+      if (blockTokens[j].type !== "inline") {
+        j++;
+        continue;
+      }
+      tokens = blockTokens[j].children;
+      i = tokens.length - 1;
+      while (i >= 0) {
+        token = tokens[i];
+        blockTokens[j].children = tokens = arrayReplaceAt(tokens, i, splitTextToken(token, state.Token));
+        i--;
+      }
+      j++;
+    }
+  };
+};
+
+
+/*global module */
+
+module.exports = function(md, options) {
+  "use strict";
+  md.core.ruler.push("checkbox", checkboxReplace(md, options));
+};