diff --git a/tests/drag_tests.html b/tests/drag_tests.html
deleted file mode 100644
index 06acef0f5..000000000
--- a/tests/drag_tests.html
+++ /dev/null
@@ -1,606 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<title>Blockly Playground</title>
-<script src="../blockly_uncompressed.js"></script>
-<script src="../msg/messages.js"></script>
-<script src="../blocks/logic.js"></script>
-<script src="../blocks/loops.js"></script>
-<script src="../blocks/math.js"></script>
-<script src="../blocks/text.js"></script>
-<script src="../blocks/lists.js"></script>
-<script src="../blocks/colour.js"></script>
-<script src="../blocks/variables.js"></script>
-<script src="../blocks/procedures.js"></script>
-<script>
-'use strict';
-// Depending on the URL argument, render as LTR or RTL.
-var rtl = (document.location.search == '?rtl');
-var workspace = null;
-var fakeDragQueue = [];
-
-
-function start() {
-  var toolbox = document.getElementById('toolbox');
-  workspace = Blockly.inject('blocklyDiv',
-          {comments: true,
-           disable: true,
-           collapse: true,
-           grid:
-             {spacing: 25,
-              length: 3,
-              colour: '#ccc',
-              snap: true},
-           maxBlocks: Infinity,
-           media: '../media/',
-           readOnly: false,
-           rtl: rtl,
-           scrollbars: true,
-           toolbox: toolbox,
-           zoom:
-             {controls: true,
-              wheel: true,
-              startScale: 1.0,
-              maxScale: 4,
-              minScale: .25,
-              scaleSpeed: 1.1}
-          });
-  // Restore previously displayed text.
-  if (sessionStorage) {
-    var text = sessionStorage.getItem('textarea');
-    if (text) {
-      document.getElementById('importExport').value = text;
-    }
-    // Restore event logging state.
-    var state = sessionStorage.getItem('logEvents');
-    logEvents(Boolean(Number(state)));
-  } else {
-    // MSIE 11 does not support sessionStorage on file:// URLs.
-    logEvents(false);
-  }
-  taChange();
-
-  window.setTimeout(function() {
-    airstrike(100);
-    fakeManyDrags();
-  }, 1000);
-}
-
-function toXml() {
-  var output = document.getElementById('importExport');
-  var xml = Blockly.Xml.workspaceToDom(workspace);
-  output.value = Blockly.Xml.domToPrettyText(xml);
-  output.focus();
-  output.select();
-  taChange();
-}
-
-function fromXml() {
-  var input = document.getElementById('importExport');
-  var xml = Blockly.Xml.textToDom(input.value);
-  Blockly.Xml.domToWorkspace(xml, workspace);
-  taChange();
-}
-
-// Disable the "Import from XML" button if the XML is invalid.
-// Preserve text between page reloads.
-function taChange() {
-  var textarea = document.getElementById('importExport');
-  if (sessionStorage) {
-    sessionStorage.setItem('textarea', textarea.value);
-  }
-  var valid = true;
-  try {
-    Blockly.Xml.textToDom(textarea.value);
-  } catch (e) {
-    valid = false;
-  }
-  document.getElementById('import').disabled = !valid;
-}
-
-function logEvents(state) {
-  var checkbox = document.getElementById('logCheck');
-  checkbox.checked = state;
-  if (sessionStorage) {
-    sessionStorage.setItem('logEvents', Number(state));
-  }
-  if (state) {
-    workspace.addChangeListener(logger);
-  } else {
-    workspace.removeChangeListener(logger);
-  }
-}
-
-function logger(e) {
-  console.log(e);
-}
-
-function airstrike(n) {
-  var prototypes = [];
-  var toolbox = document.getElementById('toolbox');
-  var blocks = toolbox.getElementsByTagName('block');
-  for (var i = 0, block; block = blocks[i]; i++) {
-    prototypes.push(block.getAttribute('type'));
-  }
-  for (var i = 0; i < n; i++) {
-    var prototype = prototypes[Math.floor(Math.random() * prototypes.length)];
-    var block = workspace.newBlock(prototype);
-    block.initSvg();
-    block.getSvgRoot().setAttribute('transform', 'translate(' +
-        Math.round(Math.random() * 450 + 40) + ', ' +
-        Math.round(Math.random() * 600 + 40) + ')');
-    block.render();
-  }
-}
-
-function fakeDrag(id, dx, dy, opt_workspace) {
-  var ws = opt_workspace ? opt_workspace : Blockly.getMainWorkspace();
-  var blockToDrag = ws.getBlockById(id);
-
-  if (!blockToDrag) {
-    return;
-  }
-  var blockTop = blockToDrag.svgGroup_.getBoundingClientRect().top;
-  var blockLeft = blockToDrag.svgGroup_.getBoundingClientRect().left;
-
-  // Click somewhere on the block.
-  var mouseDownEvent = new MouseEvent('mousedown',
-      {clientX: blockLeft + 5, clientY: blockTop + 5});
-  blockToDrag.onMouseDown_(mouseDownEvent);
-
-  // Throw in a move for good measure.
-  window.setTimeout(
-    function() {
-      var mouseMoveEvent = new MouseEvent('mousemove',
-          {clientX: blockLeft + dx,
-          clientY: blockTop + dy});
-      blockToDrag.onMouseMove_(mouseMoveEvent);
-
-      // Drop at dx, dy.
-      window.setTimeout(
-        function() {
-          var mouseUpEvent = new MouseEvent('mouseup',
-              {clientX: blockLeft + dx,
-              clientY: blockTop + dy});
-          blockToDrag.onMouseUp_(mouseUpEvent);
-
-          window.setTimeout(fakeDragWrapper(), 100);
-        }, 30);
-    }, 30);
-};
-
-function fakeDragWrapper() {
-  var dragInfo = fakeDragQueue.pop();
-  if (dragInfo) {
-    fakeDrag(dragInfo.id, dragInfo.dx, dragInfo.dy, dragInfo.workspace);
-  }
-}
-
-function fakeManyDrags() {
-  console.log('fake many drags');
-  var ws = Blockly.getMainWorkspace();
-  var blockList = ws.getAllBlocks();
-  for (var i = 0; i < 2 * blockList.length; i++) {
-    fakeDragQueue.push(
-      {
-        id: blockList[Math.round(Math.random() * (blockList.length - 1))].id,
-        // Move some blocks up and to the left, but mostly down and to the right.
-        dx: Math.round((Math.random() - 0.25) * 200),
-        dy: Math.round((Math.random() - 0.25)* 200),
-        workspace: ws
-      });
-  }
-  fakeDragWrapper();
-};
-
-function spaghetti(n) {
-  var xml = spaghettiXml;
-  for(var i = 0; i < n; i++) {
-    xml = xml.replace(/(<(statement|next)( name="DO0")?>)<\//g,
-        '$1' + spaghettiXml + '</');
-  }
-  xml = '<xml xmlns="http://www.w3.org/1999/xhtml">' + xml + '</xml>';
-  var dom = Blockly.Xml.textToDom(xml);
-  console.time('Spaghetti domToWorkspace');
-  Blockly.Xml.domToWorkspace(dom, workspace);
-  console.timeEnd('Spaghetti domToWorkspace');
-}
-var spaghettiXml = [
-  '  <block type="controls_if">',
-  '    <value name="IF0">',
-  '      <block type="logic_compare">',
-  '        <field name="OP">EQ</field>',
-  '        <value name="A">',
-  '          <block type="math_arithmetic">',
-  '            <field name="OP">MULTIPLY</field>',
-  '            <value name="A">',
-  '              <block type="math_number">',
-  '                <field name="NUM">6</field>',
-  '              </block>',
-  '            </value>',
-  '            <value name="B">',
-  '              <block type="math_number">',
-  '                <field name="NUM">7</field>',
-  '              </block>',
-  '            </value>',
-  '          </block>',
-  '        </value>',
-  '        <value name="B">',
-  '          <block type="math_number">',
-  '            <field name="NUM">42</field>',
-  '          </block>',
-  '        </value>',
-  '      </block>',
-  '    </value>',
-  '    <statement name="DO0"></statement>',
-  '    <next></next>',
-  '  </block>'].join('\n');
-
-</script>
-
-<style>
-html, body {
-  height: 100%;
-}
-body {
-  background-color: #fff;
-  font-family: sans-serif;
-  overflow: hidden;
-}
-h1 {
-  font-weight: normal;
-  font-size: 140%;
-}
-#blocklyDiv {
-  float: right;
-  height: 95%;
-  width: 70%;
-}
-#importExport {
-  font-family: monospace;
-}
-</style>
-</head>
-<body onload="start()">
-
-  <div id="blocklyDiv"></div>
-
-  <xml id="toolbox" style="display: none">
-    <category name="Logic" colour="210">
-      <block type="controls_if"></block>
-      <block type="logic_compare"></block>
-      <block type="logic_operation"></block>
-      <block type="logic_negate"></block>
-      <block type="logic_boolean"></block>
-      <block type="logic_null" disabled="true"></block>
-      <block type="logic_ternary"></block>
-    </category>
-    <category name="Loops" colour="120">
-      <block type="controls_repeat_ext">
-        <value name="TIMES">
-          <shadow type="math_number">
-            <field name="NUM">10</field>
-          </shadow>
-        </value>
-      </block>
-      <block type="controls_repeat" disabled="true"></block>
-      <block type="controls_whileUntil"></block>
-      <block type="controls_for">
-        <value name="FROM">
-          <shadow type="math_number">
-            <field name="NUM">1</field>
-          </shadow>
-        </value>
-        <value name="TO">
-          <shadow type="math_number">
-            <field name="NUM">10</field>
-          </shadow>
-        </value>
-        <value name="BY">
-          <shadow type="math_number">
-            <field name="NUM">1</field>
-          </shadow>
-        </value>
-      </block>
-      <block type="controls_forEach"></block>
-      <block type="controls_flow_statements"></block>
-    </category>
-    <category name="Math" colour="230">
-      <block type="math_number" gap="32"></block>
-      <block type="math_arithmetic">
-        <value name="A">
-          <shadow type="math_number">
-            <field name="NUM">1</field>
-          </shadow>
-        </value>
-        <value name="B">
-          <shadow type="math_number">
-            <field name="NUM">1</field>
-          </shadow>
-        </value>
-      </block>
-      <block type="math_single">
-        <value name="NUM">
-          <shadow type="math_number">
-            <field name="NUM">9</field>
-          </shadow>
-        </value>
-      </block>
-      <block type="math_trig">
-        <value name="NUM">
-          <shadow type="math_number">
-            <field name="NUM">45</field>
-          </shadow>
-        </value>
-      </block>
-      <block type="math_constant"></block>
-      <block type="math_number_property">
-        <value name="NUMBER_TO_CHECK">
-          <shadow type="math_number">
-            <field name="NUM">0</field>
-          </shadow>
-        </value>
-      </block>
-      <block type="math_change">
-        <value name="DELTA">
-          <shadow type="math_number">
-            <field name="NUM">1</field>
-          </shadow>
-        </value>
-      </block>
-      <block type="math_round">
-        <value name="NUM">
-          <shadow type="math_number">
-            <field name="NUM">3.1</field>
-          </shadow>
-        </value>
-      </block>
-      <block type="math_on_list"></block>
-      <block type="math_modulo">
-        <value name="DIVIDEND">
-          <shadow type="math_number">
-            <field name="NUM">64</field>
-          </shadow>
-        </value>
-        <value name="DIVISOR">
-          <shadow type="math_number">
-            <field name="NUM">10</field>
-          </shadow>
-        </value>
-      </block>
-      <block type="math_constrain">
-        <value name="VALUE">
-          <shadow type="math_number">
-            <field name="NUM">50</field>
-          </shadow>
-        </value>
-        <value name="LOW">
-          <shadow type="math_number">
-            <field name="NUM">1</field>
-          </shadow>
-        </value>
-        <value name="HIGH">
-          <shadow type="math_number">
-            <field name="NUM">100</field>
-          </shadow>
-        </value>
-      </block>
-      <block type="math_random_int">
-        <value name="FROM">
-          <shadow type="math_number">
-            <field name="NUM">1</field>
-          </shadow>
-        </value>
-        <value name="TO">
-          <shadow type="math_number">
-            <field name="NUM">100</field>
-          </shadow>
-        </value>
-      </block>
-      <block type="math_random_float"></block>
-    </category>
-    <category name="Text" colour="160">
-      <block type="text"></block>
-      <block type="text_join"></block>
-      <block type="text_append">
-        <value name="TEXT">
-          <shadow type="text"></shadow>
-        </value>
-      </block>
-      <block type="text_length">
-        <value name="VALUE">
-          <shadow type="text">
-            <field name="TEXT">abc</field>
-          </shadow>
-        </value>
-      </block>
-      <block type="text_isEmpty">
-        <value name="VALUE">
-          <shadow type="text">
-            <field name="TEXT"></field>
-          </shadow>
-        </value>
-      </block>
-      <block type="text_indexOf">
-        <value name="VALUE">
-          <block type="variables_get">
-            <field name="VAR">text</field>
-          </block>
-        </value>
-        <value name="FIND">
-          <shadow type="text">
-            <field name="TEXT">abc</field>
-          </shadow>
-        </value>
-      </block>
-      <block type="text_charAt">
-        <value name="VALUE">
-          <block type="variables_get">
-            <field name="VAR">text</field>
-          </block>
-        </value>
-      </block>
-      <block type="text_getSubstring">
-        <value name="STRING">
-          <block type="variables_get">
-            <field name="VAR">text</field>
-          </block>
-        </value>
-      </block>
-      <block type="text_changeCase">
-        <value name="TEXT">
-          <shadow type="text">
-            <field name="TEXT">abc</field>
-          </shadow>
-        </value>
-      </block>
-      <block type="text_trim">
-        <value name="TEXT">
-          <shadow type="text">
-            <field name="TEXT">abc</field>
-          </shadow>
-        </value>
-      </block>
-      <block type="text_print">
-        <value name="TEXT">
-          <shadow type="text">
-            <field name="TEXT">abc</field>
-          </shadow>
-        </value>
-      </block>
-      <block type="text_prompt_ext">
-        <value name="TEXT">
-          <shadow type="text">
-            <field name="TEXT">abc</field>
-          </shadow>
-        </value>
-      </block>
-    </category>
-    <category name="Lists" colour="260">
-      <block type="lists_create_with">
-        <mutation items="0"></mutation>
-      </block>
-      <block type="lists_create_with"></block>
-      <block type="lists_repeat">
-        <value name="NUM">
-          <shadow type="math_number">
-            <field name="NUM">5</field>
-          </shadow>
-        </value>
-      </block>
-      <block type="lists_length"></block>
-      <block type="lists_isEmpty"></block>
-      <block type="lists_indexOf">
-        <value name="VALUE">
-          <block type="variables_get">
-            <field name="VAR">list</field>
-          </block>
-        </value>
-      </block>
-      <block type="lists_getIndex">
-        <value name="VALUE">
-          <block type="variables_get">
-            <field name="VAR">list</field>
-          </block>
-        </value>
-      </block>
-      <block type="lists_setIndex">
-        <value name="LIST">
-          <block type="variables_get">
-            <field name="VAR">list</field>
-          </block>
-        </value>
-      </block>
-      <block type="lists_getSublist">
-        <value name="LIST">
-          <block type="variables_get">
-            <field name="VAR">list</field>
-          </block>
-        </value>
-      </block>
-      <block type="lists_split">
-        <value name="DELIM">
-          <shadow type="text">
-            <field name="TEXT">,</field>
-          </shadow>
-        </value>
-      </block>
-      <block type="lists_sort"></block>
-    </category>
-    <category name="Colour" colour="20">
-      <block type="colour_picker"></block>
-      <block type="colour_random"></block>
-      <block type="colour_rgb">
-        <value name="RED">
-          <shadow type="math_number">
-            <field name="NUM">100</field>
-          </shadow>
-        </value>
-        <value name="GREEN">
-          <shadow type="math_number">
-            <field name="NUM">50</field>
-          </shadow>
-        </value>
-        <value name="BLUE">
-          <shadow type="math_number">
-            <field name="NUM">0</field>
-          </shadow>
-        </value>
-      </block>
-      <block type="colour_blend">
-        <value name="COLOUR1">
-          <shadow type="colour_picker">
-            <field name="COLOUR">#ff0000</field>
-          </shadow>
-        </value>
-        <value name="COLOUR2">
-          <shadow type="colour_picker">
-            <field name="COLOUR">#3333ff</field>
-          </shadow>
-        </value>
-        <value name="RATIO">
-          <shadow type="math_number">
-            <field name="NUM">0.5</field>
-          </shadow>
-        </value>
-      </block>
-    </category>
-    <sep></sep>
-    <category name="Variables" colour="330" custom="VARIABLE"></category>
-    <category name="Functions" colour="290" custom="PROCEDURE"></category>
-  </xml>
-
-  <h1>Blockly Playground</h1>
-
-  <p><a href="javascript:void(workspace.setVisible(true))">Show</a>
-   - <a href="javascript:void(workspace.setVisible(false))">Hide</a></p>
-
-  <script>
-    if (rtl) {
-      document.write('[ &larr; RTL. Switch to <A HREF="?ltr">LTR</A>. ]');
-    } else {
-      document.write('[ &rarr; LTR. Switch to <A HREF="?rtl">RTL</A>. ]');
-    }
-  </script>
-
-  <p>
-    <input type="button" value="Export to XML" onclick="toXml()">
-    &nbsp;
-    <input type="button" value="Import from XML" onclick="fromXml()" id="import">
-    <textarea id="importExport" style="width: 26%; height: 12em"
-      onchange="taChange();" onkeyup="taChange()"></textarea>
-  </p>
-
-  <p>
-    Stress test: &nbsp;
-    <input type="button" value="Airstrike!" onclick="airstrike(100)">
-    <input type="button" value="Spaghetti!" onclick="spaghetti(8)">
-  </p>
-  <p>
-    Log events: &nbsp;
-    <input type="checkbox" onclick="logEvents(this.checked)" id="logCheck">
-  </p>
-
-</body>
-</html>
