diff --git a/demos/generator/index.html b/demos/generator/index.html
index 60eae46e8..e808d8c33 100644
--- a/demos/generator/index.html
+++ b/demos/generator/index.html
@@ -63,9 +63,60 @@
     </category>
   </xml>
 
+  <xml id="startBlocks" style="display: none">
+    <block type="controls_if" inline="false" x="20" y="20">
+      <mutation else="1"></mutation>
+      <value name="IF0">
+        <block type="logic_compare" inline="true">
+          <field name="OP">EQ</field>
+          <value name="A">
+            <block type="math_arithmetic" inline="true">
+              <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">
+        <block type="text_print" inline="false">
+          <value name="TEXT">
+            <block type="text">
+              <field name="TEXT">Don't panic</field>
+            </block>
+          </value>
+        </block>
+      </statement>
+      <statement name="ELSE">
+        <block type="text_print" inline="false">
+          <value name="TEXT">
+            <block type="text">
+              <field name="TEXT">Panic</field>
+            </block>
+          </value>
+        </block>
+      </statement>
+    </block>
+  </xml>
+
   <script>
     Blockly.inject(document.getElementById('blocklyDiv'),
         {toolbox: document.getElementById('toolbox')});
+    Blockly.Xml.domToWorkspace(Blockly.mainWorkspace,
+        document.getElementById('startBlocks'));
 
     function showCode() {
       // Generate JavaScript code and display it.
diff --git a/demos/interpreter/index.html b/demos/interpreter/index.html
index 878d30f5f..c482b8e41 100644
--- a/demos/interpreter/index.html
+++ b/demos/interpreter/index.html
@@ -71,9 +71,60 @@
     <category name="Functions" custom="PROCEDURE"></category>
   </xml>
 
+  <xml id="startBlocks" style="display: none">
+    <block type="variables_set" inline="true" x="20" y="20">
+      <field name="VAR">n</field>
+      <value name="VALUE">
+        <block type="math_number">
+          <field name="NUM">1</field>
+        </block>
+      </value>
+      <next>
+        <block type="controls_repeat_ext" inline="true">
+          <value name="TIMES">
+            <block type="math_number">
+              <field name="NUM">4</field>
+            </block>
+          </value>
+          <statement name="DO">
+            <block type="variables_set" inline="true">
+              <field name="VAR">n</field>
+              <value name="VALUE">
+                <block type="math_arithmetic" inline="true">
+                  <field name="OP">MULTIPLY</field>
+                  <value name="A">
+                    <block type="variables_get">
+                      <field name="VAR">n</field>
+                    </block>
+                  </value>
+                  <value name="B">
+                    <block type="math_number">
+                      <field name="NUM">2</field>
+                    </block>
+                  </value>
+                </block>
+              </value>
+            </block>
+          </statement>
+          <next>
+            <block type="text_print" inline="false">
+              <value name="TEXT">
+                <block type="variables_get">
+                  <field name="VAR">n</field>
+                </block>
+              </value>
+            </block>
+          </next>
+        </block>
+      </next>
+    </block>
+  </xml>
+
   <script>
     Blockly.inject(document.getElementById('blocklyDiv'),
         {toolbox: document.getElementById('toolbox')});
+    Blockly.Xml.domToWorkspace(Blockly.mainWorkspace,
+        document.getElementById('startBlocks'));
 
     var myInterpreter = null;