diff --git a/tests/rendering/svg_paths.html b/tests/rendering/svg_paths.html
deleted file mode 100644
index fe415c2f6..000000000
--- a/tests/rendering/svg_paths.html
+++ /dev/null
@@ -1,98 +0,0 @@
-<!DOCTYPE html>
-<!--
-@license
-Copyright 2019 Google LLC
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
--->
-<html>
-<head>
-  <meta charset="utf-8">
-  <title>SVG Path Playground</title>
-  <script src="../../blockly_uncompressed.js"></script>
-
-  <style>
-    html, body {
-      height: 100%;
-    }
-    body {
-      background-color: #fff;
-      font-family: sans-serif;
-      overflow: hidden;
-    }
-    .pathDebugClass {
-      stroke-width: 1px;
-      stroke: black;
-      fill: none;
-    }
-    .lineStartMarker {
-      fill: blue;
-    }
-  </style>
-
-<script>
-'use strict';
-var svgSpace;
-
-function addPathAt(path, x, y) {
-  var group = Blockly.utils.dom.createSvgElement(
-      Blockly.utils.Svg.G,
-      {
-        'transform': 'translate(' + (x + 50) + ', ' + y + ')'
-      }, svgSpace);
-  Blockly.utils.dom.createSvgElement(
-      Blockly.utils.Svg.PATH, {
-        'd': 'M 0,0 ' + path,
-        'marker-start': 'url(#startDot)',
-        'marker-end': 'url(#endDot)',
-        'class': 'pathDebugClass'
-      },
-      group);
-
-
-  return group;
-}
-
-function start() {
-  svgSpace = document.getElementById('workspace');
-  addPathAt(Blockly.BlockSvg.START_HAT_PATH, 0, 40);
-  addPathAt(Blockly.BlockSvg.NOTCH_PATH_LEFT, 0, 60);
-  addPathAt(Blockly.BlockSvg.NOTCH_PATH_RIGHT, 0, 70);
-  addPathAt(Blockly.BlockSvg.INNER_TOP_LEFT_CORNER, 0, 90);
-}
-</script>
-
-</head>
-
-<body onload="start()">
-
-  <svg xmlns="http://www.w4.org/2000/svg" version="1.1" width="1000px" height="1000px" viewBox="0 0 200 200" id="workspace">
-
-    <defs>
-      <!-- Background grid -->
-      <pattern id="grid" patternUnits="userSpaceOnUse" width="10" height="10">
-        <line stroke="#ccc" stroke-width="2" x1="0" y1="1" x2="2" y2="1"></line>
-      </pattern>
-      <!-- simple dot marker definitions -->
-      <marker id="startDot" viewBox="0 0 10 10" refX="5" refY="5"
-          markerWidth="5" markerHeight="5">
-        <circle cx="5" cy="5" r="2" fill="red" />
-      </marker>
-      <marker id="endDot" viewBox="0 0 10 10" refX="5" refY="5"
-          markerWidth="5" markerHeight="5">
-        <circle cx="5" cy="5" r="2" fill="blue" />
-      </marker>
-    </defs>
-    <rect x="0" y="0" width="1000" height="1000" style="fill:url(#grid);"></rect>
-  </svg>
-</body>
diff --git a/tests/rendering/zelos/README.md b/tests/rendering/zelos/README.md
deleted file mode 100644
index d8cf459df..000000000
--- a/tests/rendering/zelos/README.md
+++ /dev/null
@@ -1,19 +0,0 @@
-# Zelos Rendering / PXT-Blockly Comparison Playground
-
-## Dependencies
-```
-npm install -g http-server
-```
-
-## Running the Playground:
-
-In Blockly's root directory, run:
-```
-http-server ./
-```
-
-and browse to:
-```
-http://127.0.0.1:8080/tests/rendering/zelos
-```
-
diff --git a/tests/rendering/zelos/index.html b/tests/rendering/zelos/index.html
deleted file mode 100644
index 4516b79be..000000000
--- a/tests/rendering/zelos/index.html
+++ /dev/null
@@ -1,247 +0,0 @@
-<html>
-
-<head>
-  <style>
-    html,
-    body {
-      margin: 0;
-    }
-
-    #frames {
-      position: absolute;
-      width: 100%;
-      height: calc(100% - 3rem);
-      bottom: 0;
-    }
-
-    #frames .row {
-      position: relative;
-      display: flex;
-      flex-direction: row;
-    }
-
-    #frames .col {
-      flex: 1;
-      width: 100%;
-      height: 100%;
-    }
-
-    #frames .col h2 {
-      text-align: center;
-    }
-
-    #frames iframe {
-      border: 0;
-      margin: 0;
-      padding: 0;
-      width: 100%;
-      height: 500px;
-    }
-
-    .output {
-      height: 500px;
-    }
-  </style>
-</head>
-
-<body>
-  <select id="selector">
-    <option value="colour_blend">colour_blend</option>
-    <option value="colour_picker">colour_picker</option>
-    <option value="colour_random">colour_random</option>
-    <option value="colour_rgb">colour_rgb</option>
-    <option value="controls_flow_statements">controls_flow_statements</option>
-    <option value="controls_for">controls_for</option>
-    <option value="controls_forEach">controls_forEach</option>
-    <option value="controls_if">controls_if</option>
-    <option value="controls_if_else">controls_if_else</option>
-    <option value="controls_if_elseif">controls_if_elseif</option>
-    <option value="controls_if_if">controls_if_if</option>
-    <option value="controls_ifelse">controls_ifelse</option>
-    <option value="controls_repeat">controls_repeat</option>
-    <option value="controls_repeat_ext">controls_repeat_ext</option>
-    <option value="controls_whileUntil">controls_whileUntil</option>
-    <option value="lists_create_empty">lists_create_empty</option>
-    <option value="lists_create_with">lists_create_with</option>
-    <option value="lists_create_with_container">lists_create_with_container</option>
-    <option value="lists_create_with_item">lists_create_with_item</option>
-    <option value="lists_getIndex">lists_getIndex</option>
-    <option value="lists_getSublist">lists_getSublist</option>
-    <option value="lists_indexOf">lists_indexOf</option>
-    <option value="lists_isEmpty">lists_isEmpty</option>
-    <option value="lists_length">lists_length</option>
-    <option value="lists_repeat">lists_repeat</option>
-    <option value="lists_reverse">lists_reverse</option>
-    <option value="lists_setIndex">lists_setIndex</option>
-    <option value="lists_sort">lists_sort</option>
-    <option value="lists_split">lists_split</option>
-    <option value="logic_boolean">logic_boolean</option>
-    <option value="logic_compare">logic_compare</option>
-    <option value="logic_negate">logic_negate</option>
-    <option value="logic_null">logic_null</option>
-    <option value="logic_operation">logic_operation</option>
-    <option value="logic_ternary">logic_ternary</option>
-    <option value="math_addition">math_addition</option>
-    <option value="math_arithmetic">math_arithmetic</option>
-    <option value="math_atan2">math_atan2</option>
-    <option value="math_change">math_change</option>
-    <option value="math_constant">math_constant</option>
-    <option value="math_constrain">math_constrain</option>
-    <option value="math_modulo">math_modulo</option>
-    <option value="math_number">math_number</option>
-    <option value="math_number_property">math_number_property</option>
-    <option value="math_on_list">math_on_list</option>
-    <option value="math_random_float">math_random_float</option>
-    <option value="math_random_int">math_random_int</option>
-    <option value="math_round">math_round</option>
-    <option value="math_single">math_single</option>
-    <option value="math_subtraction">math_subtraction</option>
-    <option value="math_trig">math_trig</option>
-    <option value="multi_block_1">multi_block_1</option>
-    <option value="multi_block_logic">multi_block_logic</option>
-    <option value="multi_colour_with_external">multi_colour_with_external</option>
-    <option value="multi_colour_with_internal">multi_colour_with_internal</option>
-    <option value="multi_stack">multi_stack</option>
-    <option value="not_true">not_true</option>
-    <option value="procedures_callnoreturn">procedures_callnoreturn</option>
-    <option value="procedures_callreturn">procedures_callreturn</option>
-    <option value="procedures_defnoreturn">procedures_defnoreturn</option>
-    <option value="procedures_defreturn">procedures_defreturn</option>
-    <option value="procedures_ifreturn">procedures_ifreturn</option>
-    <option value="procedures_mutatorarg">procedures_mutatorarg</option>
-    <option value="procedures_mutatorcontainer">procedures_mutatorcontainer</option>
-    <option value="text_append">text_append</option>
-    <option value="text_changeCase">text_changeCase</option>
-    <option value="text_charAt">text_charAt</option>
-    <option value="text_count">text_count</option>
-    <option value="text_create_join_container">text_create_join_container</option>
-    <option value="text_create_join_item">text_create_join_item</option>
-    <option value="text_getSubstring">text_getSubstring</option>
-    <option value="text_indexOf">text_indexOf</option>
-    <option value="text_isEmpty">text_isEmpty</option>
-    <option value="text_join">text_join</option>
-    <option value="text_length">text_length</option>
-    <option value="text_print">text_print</option>
-    <option value="text_prompt">text_prompt</option>
-    <option value="text_prompt_ext">text_prompt_ext</option>
-    <option value="text_replace">text_replace</option>
-    <option value="text_reverse">text_reverse</option>
-    <option value="text_trim">text_trim</option>
-    <option value="variables_get">variables_get</option>
-    <option value="variables_get_dynamic">variables_get_dynamic</option>
-    <option value="variables_set">variables_set</option>
-    <option value="variables_set_dynamic">variables_set_dynamic</option>
-  </select>
-  <div id="frames">
-    <div class="row">
-      <div class="col">
-        <h2>Zelos Rendering</h2>
-      </div>
-      <div class="col">
-        <h2>PXT-Blockly Rendering</h2>
-      </div>
-    </div>
-    <div class="row">
-      <div class="col">
-        <iframe id="zelos" src="./zelos.html"></iframe>
-      </div>
-      <div class="col">
-        <iframe id="pxtblockly" src="./pxtblockly.html"></iframe>
-      </div>
-    </div>
-    <div class="row">
-      <div class="col">
-        <div id="zelosout">
-          <h2>Zelos Rendering</h2>
-          <img id="zelosoutput" class="output" />
-        </div>
-        <div id="pxtblocklyout">
-          <h2>PXT-Blockly Rendering</h2>
-          <img id="pxtblocklyoutput" class="output" />
-        </div>
-      </div>
-    </div>
-  </div>
-
-  <script type="text/javascript">
-    var pxtblockly = document.getElementById('pxtblockly');
-    var zelos = document.getElementById('zelos');
-    var selector = document.getElementById('selector');
-    var hash = document.location.hash;
-    if (hash) {
-      selector.value = hash.substring(1);
-    }
-
-    window.addEventListener('message', function (msg) {
-      var data = msg.data;
-      if (data.type === 'svg') {
-        var output = document.getElementById(data.from + 'output');
-        output.src = data.text;
-      }
-    });
-
-    var current = 'zelos';
-    var pause = false;
-    document.getElementById('pxtblocklyout').style.display = 'none';
-    setInterval(function () {
-      if (!pause) {
-        document.getElementById(current + 'out').style.display = 'none';
-        current = current == 'zelos' ? 'pxtblockly' : 'zelos';
-        document.getElementById(current + 'out').style.display = 'block';
-      }
-    }, 1000);
-
-    pxtblockly.addEventListener('load', function () {
-      updateWorkspaces(selector.value);
-    });
-
-    zelos.addEventListener('load', function () {
-      updateWorkspaces(selector.value);
-    });
-
-    selector.addEventListener('change', function (e) {
-      updateWorkspaces(e.target.value);
-    });
-
-    function updateWorkspaces(testCase) {
-      var fileName = '../../screenshot/test_cases/' + testCase;
-      window.location.hash = testCase;
-
-      var rawFile = new XMLHttpRequest();
-      rawFile.open('GET', fileName, false);
-      rawFile.onreadystatechange = function () {
-        if (rawFile.readyState === 4) {
-          if (rawFile.status === 200 || rawFile.status == 0) {
-            var xml = rawFile.responseText;
-            if (xml) {
-              pxtblockly.contentWindow.postMessage({
-                type: 'post',
-                xml: xml
-              }, '*');
-              zelos.contentWindow.postMessage({
-                type: 'post',
-                xml: xml
-              }, '*');
-            }
-          }
-        }
-      }
-      rawFile.send();
-    }
-
-    document.addEventListener('keydown', function (e) {
-      if (e.keyCode === 37) {
-        selector.selectedIndex = selector.selectedIndex - 1;
-        updateWorkspaces(selector.value);
-      } else if (e.keyCode === 39) {
-        selector.selectedIndex = selector.selectedIndex + 1;
-        updateWorkspaces(selector.value);
-      } else if (e.keyCode === 32) {
-        pause = !pause;
-      }
-    });
-
-  </script>
-</body>
-
-</html>
\ No newline at end of file
diff --git a/tests/rendering/zelos/pxtblockly.html b/tests/rendering/zelos/pxtblockly.html
deleted file mode 100644
index d3aa9dffe..000000000
--- a/tests/rendering/zelos/pxtblockly.html
+++ /dev/null
@@ -1,66 +0,0 @@
-<html>
-
-<head>
-  <script type="text/javascript" src="https://unpkg.com/pxt-blockly@2.1.12/blockly_compressed.js"></script>
-  <script type="text/javascript" src="https://unpkg.com/pxt-blockly@2.1.12/blocks_compressed.js"></script>
-  <script type="text/javascript" src="https://unpkg.com/pxt-blockly@2.1.12/msg/messages.js"></script>
-  <script type="text/javascript" src="../../playgrounds/screenshot.js"></script>
-</head>
-
-<body>
-  <div id="blocklyDiv"></div>
-  <script>
-    var blocklyDiv = document.getElementById('blocklyDiv');
-    var workspace;
-    window.addEventListener('message', function (msg) {
-      var data = msg.data;
-      if (data.type !== 'post') {
-        return;
-      }
-      var xml = data.xml;
-      try {
-        if (workspace) {
-          workspace.dispose();
-          blocklyDiv.innerHTML = '';
-        }
-      } catch { }
-
-      workspace = Blockly.inject(blocklyDiv, {
-        move: {
-          scrollbars: true,
-          drag: true,
-          wheel: false,
-        },
-        zoom: {
-          wheel: true,
-          startScale: 2,
-        }
-      });
-
-      Blockly.Xml.domToWorkspace(Blockly.Xml.textToDom(xml), workspace);
-
-      function postChange() {
-        try {
-          var topBlock = workspace.getTopBlocks()[0];
-          workspaceToSvg_(workspace, function (datauri) {
-            window.parent.postMessage({
-              type: 'svg',
-              from: 'pxtblockly',
-              text: datauri
-            }, '*');
-          });
-        } catch { }
-      }
-
-      workspace.addChangeListener(function(e) {
-        if (e.type != 'ui') {
-          postChange();
-        }
-      });
-
-      postChange();
-    });
-  </script>
-</body>
-
-</html>
\ No newline at end of file
diff --git a/tests/rendering/zelos/pxtblockly/index.html b/tests/rendering/zelos/pxtblockly/index.html
deleted file mode 100644
index 6a53da072..000000000
--- a/tests/rendering/zelos/pxtblockly/index.html
+++ /dev/null
@@ -1,166 +0,0 @@
-<html>
-
-<head>
-  <script type="text/javascript" src="../../../../blockly_uncompressed.js"></script>
-  <script type="text/javascript" src="https://unpkg.com/pxt-blockly@2.1.12/blocks_compressed.js"></script>
-  <script type="text/javascript" src="https://unpkg.com/pxt-blockly@2.1.12/msg/messages.js"></script>
-  <style>
-    html,
-    body {
-      margin: 0;
-    }
-
-    #frames {
-      position: absolute;
-      width: 100%;
-      height: calc(100% - 3rem);
-      bottom: 0;
-    }
-
-    #frames .row {
-      position: relative;
-      display: flex;
-      flex-direction: row;
-    }
-
-    #frames .col {
-      flex: 1;
-      width: 100%;
-      height: 100%;
-    }
-
-    #frames .col h2 {
-      text-align: center;
-    }
-
-    #frames iframe {
-      border: 0;
-      margin: 0;
-      padding: 0;
-      width: 100%;
-      height: 300px;
-    }
-
-    .output {
-      max-height: 300px;
-      max-width: 100%;
-    }
-  </style>
-</head>
-
-<body>
-  <select id="selector">
-  </select>
-  <a href="../scratchblocks/">Scratch-Blocks</a>
-  <script>
-    var selector = document.getElementById('selector');
-    for (var blockId in Blockly.Blocks) {
-      if (!Object.keys(Blockly.Blocks[blockId]).length) continue;
-      var option = document.createElement('option');
-      option.value = blockId;
-      option.textContent = blockId;
-      selector.appendChild(option);
-    }
-  </script>
-  <div id="frames">
-    <div class="row">
-      <div class="col">
-        <h2>Zelos Rendering</h2>
-      </div>
-      <div class="col">
-        <h2>PXT-Blockly Rendering</h2>
-      </div>
-    </div>
-    <div class="row">
-      <div class="col">
-        <iframe id="zelos" src="./zelos.html"></iframe>
-      </div>
-      <div class="col">
-        <iframe id="pxtblockly" src="./pxtblockly.html"></iframe>
-      </div>
-    </div>
-    <div class="row">
-      <div class="col">
-        <div id="zelosout">
-          <h2>Zelos Rendering</h2>
-          <img id="zelosoutput" class="output" />
-        </div>
-        <div id="pxtblocklyout">
-          <h2>PXT-Blockly Rendering</h2>
-          <img id="pxtblocklyoutput" class="output" />
-        </div>
-      </div>
-    </div>
-  </div>
-
-  <script type="text/javascript">
-    var pxtblockly = document.getElementById('pxtblockly');
-    var zelos = document.getElementById('zelos');
-    var selector = document.getElementById('selector');
-    var hash = document.location.hash;
-    if (hash) {
-      selector.value = hash.substring(1);
-    }
-
-    window.addEventListener('message', function (msg) {
-      var data = msg.data;
-      if (data.type === 'svg') {
-        var output = document.getElementById(data.from + 'output');
-        output.src = data.text;
-      }
-    });
-
-    var current = 'zelos';
-    var pause = false;
-    document.getElementById('pxtblocklyout').style.display = 'none';
-    setInterval(function () {
-      if (!pause) {
-        document.getElementById(current + 'out').style.display = 'none';
-        current = current == 'zelos' ? 'pxtblockly' : 'zelos';
-        document.getElementById(current + 'out').style.display = 'block';
-      }
-    }, 1000);
-
-    pxtblockly.addEventListener('load', function () {
-      updateWorkspaces(selector.value);
-    });
-
-    zelos.addEventListener('load', function () {
-      updateWorkspaces(selector.value);
-    });
-
-    selector.addEventListener('change', function (e) {
-      updateWorkspaces(e.target.value);
-    });
-
-    function updateWorkspaces(testCase) {
-      window.location.hash = testCase;
-      var xml = `<xml xmlns="https://developers.google.com/blockly/xml">
-  <block type="${testCase}"></block>
-</xml>`;
-      pxtblockly.contentWindow.postMessage({
-        type: 'post',
-        xml: xml
-      }, '*');
-      zelos.contentWindow.postMessage({
-        type: 'post',
-        xml: xml
-      }, '*');
-    }
-
-    document.addEventListener('keydown', function (e) {
-      if (e.keyCode === 37) {
-        selector.selectedIndex = selector.selectedIndex - 1;
-        updateWorkspaces(selector.value);
-      } else if (e.keyCode === 39) {
-        selector.selectedIndex = selector.selectedIndex + 1;
-        updateWorkspaces(selector.value);
-      } else if (e.keyCode === 32) {
-        pause = !pause;
-      }
-    });
-
-  </script>
-</body>
-
-</html>
\ No newline at end of file
diff --git a/tests/rendering/zelos/pxtblockly/pxtblockly.html b/tests/rendering/zelos/pxtblockly/pxtblockly.html
deleted file mode 100644
index 8ee2e9560..000000000
--- a/tests/rendering/zelos/pxtblockly/pxtblockly.html
+++ /dev/null
@@ -1,68 +0,0 @@
-<html>
-
-<head>
-  <script type="text/javascript" src="https://unpkg.com/pxt-blockly@2.1.12/blockly_compressed.js"></script>
-  <script type="text/javascript" src="https://unpkg.com/pxt-blockly@2.1.12/blocks_compressed.js"></script>
-  <script type="text/javascript" src="https://unpkg.com/pxt-blockly@2.1.12/msg/messages.js"></script>
-  <script type="text/javascript" src="../../../playgrounds/screenshot.js"></script>
-</head>
-
-<body>
-  <div id="blocklyDiv"></div>
-  <script>
-    Blockly.utils.userAgent.IE = true;
-
-    var blocklyDiv = document.getElementById('blocklyDiv');
-    var workspace;
-    window.addEventListener('message', function (msg) {
-      var data = msg.data;
-      if (data.type !== 'post') {
-        return;
-      }
-      var xml = data.xml;
-      try {
-        if (workspace) {
-          workspace.dispose();
-          blocklyDiv.innerHTML = '';
-        }
-      } catch { }
-
-      workspace = Blockly.inject(blocklyDiv, {
-        move: {
-          scrollbars: true,
-          drag: true,
-          wheel: false,
-        },
-        zoom: {
-          wheel: true,
-          startScale: 2,
-        }
-      });
-
-      Blockly.Xml.domToWorkspace(Blockly.Xml.textToDom(xml), workspace);
-
-      function postChange() {
-        try {
-          var topBlock = workspace.getTopBlocks()[0];
-          workspaceToSvg_(workspace, function (datauri) {
-            window.parent.postMessage({
-              type: 'svg',
-              from: 'pxtblockly',
-              text: datauri
-            }, '*');
-          });
-        } catch { }
-      }
-
-      workspace.addChangeListener(function(e) {
-        if (e.type != 'ui') {
-          postChange();
-        }
-      });
-
-      postChange();
-    });
-  </script>
-</body>
-
-</html>
\ No newline at end of file
diff --git a/tests/rendering/zelos/pxtblockly/zelos.html b/tests/rendering/zelos/pxtblockly/zelos.html
deleted file mode 100644
index 4568ba25e..000000000
--- a/tests/rendering/zelos/pxtblockly/zelos.html
+++ /dev/null
@@ -1,79 +0,0 @@
-<html>
-
-<head>
-  <script type="text/javascript" src="../../../../blockly_uncompressed.js"></script>
-  <script type="text/javascript" src="https://unpkg.com/pxt-blockly@2.1.12/blocks_compressed.js"></script>
-  <script type="text/javascript" src="https://unpkg.com/pxt-blockly@2.1.12/msg/messages.js"></script>
-  <script type="text/javascript" src="../../../playgrounds/screenshot.js"></script>
-</head>
-
-<body>
-  <div id="blocklyDiv"></div>
-  <script>
-    goog.require('Blockly.blockRendering.Debug');
-    goog.require('Blockly.zelos.Renderer');
-    // Blockly.blockRendering.startDebugger();
-
-    var blocklyDiv = document.getElementById('blocklyDiv');
-    var workspace;
-    window.addEventListener('message', function (msg) {
-      var data = msg.data;
-      if (data.type !== 'post') {
-        return;
-      }
-      var xml = data.xml;
-      try {
-        if (workspace) {
-          workspace.dispose();
-          blocklyDiv.innerHTML = '';
-          window.parent.focus();
-        }
-      } catch { }
-
-      workspace = Blockly.inject(blocklyDiv, {
-        renderer: 'zelos',
-        rendererOverrides: {
-          'FIELD_TEXT_FONTFAMILY': '"Helvetica Neue", "Segoe UI", Helvetica, sans-serif',
-          'FIELD_TEXT_FONTWEIGHT': 'bold',
-          'FIELD_TEXT_FONTSIZE': 12
-        },
-        move: {
-          scrollbars: true,
-          drag: true,
-          wheel: false,
-        },
-        zoom: {
-          wheel: true,
-          startScale: 2,
-        }
-      });
-
-      Blockly.Xml.domToWorkspace(Blockly.Xml.textToDom(xml), workspace);
-
-      function postChange() {
-        try {
-          var topBlock = workspace.getTopBlocks()[0];
-          workspaceToSvg_(workspace, function (datauri) {
-            window.parent.postMessage({
-              type: 'svg',
-              from: 'zelos',
-              text: datauri
-            }, '*');
-          });
-        } catch (err) {
-          console.error(err);
-        }
-      }
-
-      workspace.addChangeListener(function(e) {
-        if (e.type != 'ui') {
-          postChange();
-        }
-      });
-
-      postChange();
-    });
-  </script>
-</body>
-
-</html>
\ No newline at end of file
diff --git a/tests/rendering/zelos/scratchblocks/index.html b/tests/rendering/zelos/scratchblocks/index.html
deleted file mode 100644
index 9814d5eaf..000000000
--- a/tests/rendering/zelos/scratchblocks/index.html
+++ /dev/null
@@ -1,166 +0,0 @@
-<html>
-
-<head>
-  <script type="text/javascript" src="../../../../blockly_uncompressed.js"></script>
-  <script type="text/javascript"
-    src="https://unpkg.com/scratch-blocks@0.1.0-prerelease.1578322100/blocks_compressed_vertical.js"></script>
-  <style>
-    html,
-    body {
-      margin: 0;
-    }
-
-    #frames {
-      position: absolute;
-      width: 100%;
-      height: calc(100% - 3rem);
-      bottom: 0;
-    }
-
-    #frames .row {
-      position: relative;
-      display: flex;
-      flex-direction: row;
-    }
-
-    #frames .col {
-      flex: 1;
-      width: 100%;
-      height: 100%;
-    }
-
-    #frames .col h2 {
-      text-align: center;
-    }
-
-    #frames iframe {
-      border: 0;
-      margin: 0;
-      padding: 0;
-      width: 100%;
-      height: 300px;
-    }
-
-    .output {
-      max-height: 300px;
-      max-width: 100%;
-    }
-  </style>
-</head>
-
-<body>
-  <select id="selector">
-  </select>
-  <a href="../pxtblockly/">PXT-Blockly</a>
-  <script>
-    var selector = document.getElementById('selector');
-    for (var blockId in Blockly.Blocks) {
-      if (!Object.keys(Blockly.Blocks[blockId]).length) continue;
-      var option = document.createElement('option');
-      option.value = blockId;
-      option.textContent = blockId;
-      selector.appendChild(option);
-    }
-  </script>
-  <div id="frames">
-    <div class="row">
-      <div class="col">
-        <h2>Zelos Rendering</h2>
-      </div>
-      <div class="col">
-        <h2>Scratch-Blocks Rendering</h2>
-      </div>
-    </div>
-    <div class="row">
-      <div class="col">
-        <iframe id="zelos" src="./zelos.html"></iframe>
-      </div>
-      <div class="col">
-        <iframe id="scratchblocks" src="./scratchblocks.html"></iframe>
-      </div>
-    </div>
-    <div class="row">
-      <div class="col">
-        <div id="zelosout">
-          <h2>Zelos Rendering</h2>
-          <img id="zelosoutput" class="output" />
-        </div>
-        <div id="scratchblocksout">
-          <h2>Scratch-Blocks Rendering</h2>
-          <img id="scratchblocksoutput" class="output" />
-        </div>
-      </div>
-    </div>
-  </div>
-
-  <script type="text/javascript">
-    var scratchblocks = document.getElementById('scratchblocks');
-    var zelos = document.getElementById('zelos');
-    var selector = document.getElementById('selector');
-    var hash = document.location.hash;
-    if (hash) {
-      selector.value = hash.substring(1);
-    }
-
-    window.addEventListener('message', function (msg) {
-      var data = msg.data;
-      if (data.type === 'svg') {
-        var output = document.getElementById(data.from + 'output');
-        output.src = data.text;
-      }
-    });
-
-    var current = 'zelos';
-    var pause = false;
-    document.getElementById('scratchblocksout').style.display = 'none';
-    setInterval(function () {
-      if (!pause) {
-        document.getElementById(current + 'out').style.display = 'none';
-        current = current == 'zelos' ? 'scratchblocks' : 'zelos';
-        document.getElementById(current + 'out').style.display = 'block';
-      }
-    }, 1000);
-
-    scratchblocks.addEventListener('load', function () {
-      updateWorkspaces(selector.value);
-    });
-
-    zelos.addEventListener('load', function () {
-      updateWorkspaces(selector.value);
-    });
-
-    selector.addEventListener('change', function (e) {
-      updateWorkspaces(e.target.value);
-    });
-
-    function updateWorkspaces(testCase) {
-      window.location.hash = testCase;
-      var xml = `<xml xmlns="https://developers.google.com/blockly/xml">
-  <block type="${testCase}"></block>
-</xml>`;
-      scratchblocks.contentWindow.postMessage({
-        type: 'post',
-        xml: xml
-      }, '*');
-      zelos.contentWindow.postMessage({
-        type: 'post',
-        xml: xml
-      }, '*');
-    }
-
-    document.addEventListener('keydown', function (e) {
-      if (e.keyCode === 37) {
-        selector.selectedIndex = selector.selectedIndex - 1;
-        updateWorkspaces(selector.value);
-      } else if (e.keyCode === 39) {
-        selector.selectedIndex = selector.selectedIndex + 1;
-        updateWorkspaces(selector.value);
-      } else if (e.keyCode === 32) {
-        pause = !pause;
-      }
-    });
-
-  </script>
-</body>
-
-</html>
\ No newline at end of file
diff --git a/tests/rendering/zelos/scratchblocks/scratchblocks.html b/tests/rendering/zelos/scratchblocks/scratchblocks.html
deleted file mode 100644
index 801123097..000000000
--- a/tests/rendering/zelos/scratchblocks/scratchblocks.html
+++ /dev/null
@@ -1,70 +0,0 @@
-<html>
-
-<head>
-  <script type="text/javascript"
-    src="https://unpkg.com/scratch-blocks@0.1.0-prerelease.1578322100/blockly_compressed_vertical.js"></script>
-  <script type="text/javascript"
-    src="https://unpkg.com/scratch-blocks@0.1.0-prerelease.1578322100/blocks_compressed_vertical.js"></script>
-  <script type="text/javascript"
-    src="https://unpkg.com/scratch-blocks@0.1.0-prerelease.1578322100/msg/messages.js"></script>
-  <script type="text/javascript" src="../../../playgrounds/screenshot.js"></script>
-</head>
-
-<body>
-  <div id="blocklyDiv"></div>
-  <script>
-    var blocklyDiv = document.getElementById('blocklyDiv');
-    var workspace;
-    window.addEventListener('message', function (msg) {
-      var data = msg.data;
-      if (data.type !== 'post') {
-        return;
-      }
-      var xml = data.xml;
-      try {
-        if (workspace) {
-          workspace.dispose();
-          blocklyDiv.innerHTML = '';
-        }
-      } catch { }
-
-      workspace = Blockly.inject(blocklyDiv, {
-        move: {
-          scrollbars: true,
-          drag: true,
-          wheel: false,
-        },
-        zoom: {
-          wheel: true,
-          startScale: 2,
-        },
-        media: 'https://unpkg.com/scratch-blocks@0.1.0-prerelease.1578322100/media/'
-      });
-
-      Blockly.Xml.domToWorkspace(Blockly.Xml.textToDom(xml), workspace);
-
-      function postChange() {
-        try {
-          var topBlock = workspace.getTopBlocks()[0];
-          workspaceToSvg_(workspace, function (datauri) {
-            window.parent.postMessage({
-              type: 'svg',
-              from: 'scratchblocks',
-              text: datauri
-            }, '*');
-          });
-        } catch { }
-      }
-
-      workspace.addChangeListener(function (e) {
-        if (e.type != 'ui') {
-          postChange();
-        }
-      });
-
-      postChange();
-    });
-  </script>
-</body>
-
-</html>
\ No newline at end of file
diff --git a/tests/rendering/zelos/scratchblocks/zelos.html b/tests/rendering/zelos/scratchblocks/zelos.html
deleted file mode 100644
index 877c4f4cb..000000000
--- a/tests/rendering/zelos/scratchblocks/zelos.html
+++ /dev/null
@@ -1,105 +0,0 @@
-<html>
-
-<head>
-  <script type="text/javascript" src="../../../../blockly_uncompressed.js"></script>
-  <script type="text/javascript"
-    src="https://unpkg.com/scratch-blocks@0.1.0-prerelease.1578322100/blocks_compressed_vertical.js"></script>
-  <script type="text/javascript"
-    src="https://unpkg.com/scratch-blocks@0.1.0-prerelease.1578322100/msg/messages.js"></script>
-  <script type="text/javascript" src="../../../playgrounds/screenshot.js"></script>
-  <script>
-
-    Blockly.Block.prototype.setColourFromRawValues_ = function (primary, secondary,
-      tertiary) {
-      primary = typeof primary === 'string' || primary instanceof String ?
-        Blockly.utils.replaceMessageReferences(primary) : primary;
-      secondary = typeof secondary === 'string' || secondary instanceof String ?
-        Blockly.utils.replaceMessageReferences(secondary) : secondary;
-      tertiary = typeof tertiary === 'string' || tertiary instanceof String ?
-        Blockly.utils.replaceMessageReferences(tertiary) : tertiary;
-
-      this.setColour(primary);
-      this.style.colourSecondary = secondary;
-      this.style.colourTertiary = tertiary;
-    };
-
-    Blockly.Block.prototype.setCategory = function (category) {
-      // NOP
-    };
-
-  </script>
-</head>
-
-<body>
-  <div id="blocklyDiv"></div>
-  <script>
-    goog.require('Blockly.blockRendering.Debug');
-    goog.require('Blockly.zelos.Renderer');
-    // Blockly.blockRendering.startDebugger();
-
-    var blocklyDiv = document.getElementById('blocklyDiv');
-    var workspace;
-    window.addEventListener('message', function (msg) {
-      var data = msg.data;
-      if (data.type !== 'post') {
-        return;
-      }
-      var xml = data.xml;
-      try {
-        if (workspace) {
-          workspace.dispose();
-          blocklyDiv.innerHTML = '';
-          window.parent.focus();
-        }
-      } catch { }
-
-      workspace = Blockly.inject(blocklyDiv, {
-        renderer: 'zelos',
-        rendererOverrides: {
-          'FIELD_TEXT_FONTFAMILY': 'Helvetica Neue',
-          'FIELD_TEXT_FONTWEIGHT': '500',
-          'FIELD_TEXT_FONTSIZE': 12,
-          'FIELD_BORDER_RECT_X_PADDING': 2.75 * 4,
-          'ADD_START_HATS': true
-        },
-        move: {
-          scrollbars: true,
-          drag: true,
-          wheel: false,
-        },
-        zoom: {
-          wheel: true,
-          startScale: 2,
-        },
-        media: 'https://unpkg.com/scratch-blocks@0.1.0-prerelease.1578322100/media/'
-      });
-
-      Blockly.Xml.domToWorkspace(Blockly.Xml.textToDom(xml), workspace);
-
-      function postChange() {
-        try {
-          var topBlock = workspace.getTopBlocks()[0];
-          workspaceToSvg_(workspace, function (datauri) {
-            window.parent.postMessage({
-              type: 'svg',
-              from: 'zelos',
-              text: datauri
-            }, '*');
-          });
-        } catch (err) {
-          console.error(err);
-        }
-      }
-
-      workspace.addChangeListener(function (e) {
-        if (e.type != 'ui') {
-          postChange();
-        }
-      });
-
-      postChange();
-    });
-  </script>
-</body>
-
-</html>
\ No newline at end of file
diff --git a/tests/rendering/zelos/zelos.html b/tests/rendering/zelos/zelos.html
deleted file mode 100644
index 13b6f06c5..000000000
--- a/tests/rendering/zelos/zelos.html
+++ /dev/null
@@ -1,79 +0,0 @@
-<html>
-
-<head>
-  <script type="text/javascript" src="../../../blockly_uncompressed.js"></script>
-  <script type="text/javascript" src="https://unpkg.com/pxt-blockly@2.1.12/blocks_compressed.js"></script>
-  <script type="text/javascript" src="https://unpkg.com/pxt-blockly@2.1.12/msg/messages.js"></script>
-  <script type="text/javascript" src="../../playgrounds/screenshot.js"></script>
-</head>
-
-<body>
-  <div id="blocklyDiv"></div>
-  <script>
-    goog.require('Blockly.blockRendering.Debug');
-    goog.require('Blockly.zelos.Renderer');
-    // Blockly.blockRendering.startDebugger();
-
-    var blocklyDiv = document.getElementById('blocklyDiv');
-    var workspace;
-    window.addEventListener('message', function (msg) {
-      var data = msg.data;
-      if (data.type !== 'post') {
-        return;
-      }
-      var xml = data.xml;
-      try {
-        if (workspace) {
-          workspace.dispose();
-          blocklyDiv.innerHTML = '';
-          window.parent.focus();
-        }
-      } catch { }
-
-      workspace = Blockly.inject(blocklyDiv, {
-        renderer: 'zelos',
-        rendererOverrides: {
-          'FIELD_TEXT_FONTFAMILY': '"Helvetica Neue", "Segoe UI", Helvetica, sans-serif',
-          'FIELD_TEXT_FONTWEIGHT': 'bold',
-          'FIELD_TEXT_FONTSIZE': 12
-        },
-        move: {
-          scrollbars: true,
-          drag: true,
-          wheel: false,
-        },
-        zoom: {
-          wheel: true,
-          startScale: 2,
-        }
-      });
-
-      Blockly.Xml.domToWorkspace(Blockly.Xml.textToDom(xml), workspace);
-
-      function postChange() {
-        try {
-          var topBlock = workspace.getTopBlocks()[0];
-          workspaceToSvg_(workspace, function (datauri) {
-            window.parent.postMessage({
-              type: 'svg',
-              from: 'zelos',
-              text: datauri
-            }, '*');
-          });
-        } catch (err) {
-          console.error(err);
-        }
-      }
-
-      workspace.addChangeListener(function(e) {
-        if (e.type != 'ui') {
-          postChange();
-        }
-      });
-
-      postChange();
-    });
-  </script>
-</body>
-
-</html>
\ No newline at end of file
