diff --git a/docs/_includes/repl.html b/docs/_includes/repl.html
index caeda82..5f60926 100644
--- a/docs/_includes/repl.html
+++ b/docs/_includes/repl.html
@@ -5,7 +5,8 @@
         <textarea rows="10" cols="70" id="script"></textarea>
         <div class="button-group">
             <button onclick="executeScript(); return false;" class="demo-button">Run</button>
-            <input type="checkbox" checked="true" class="demo-button" id="output-clear">Clear Output</input>
+            <input type="checkbox" checked="true" class="demo-button" id="output-clear" />
+            <label for="output-clear">Clear Output</label>
         </div>
     </div>
     <div>