(xxx) update JS sample

samples/003.html

@@ -9,7 +9,14 @@
       console.warn("This is a warning")
       console.info("Very important information")
       console.error("Failed to send your very important data to Google")
+
+      let x = btoa("Hello world")
+      console.log(x)
     </script>
     <h1>Check your console, there must be a few log messages there :^)</h1>
+    <p>There should be 5 logs.</p>
+
+    <h2>There aren't that many logs (or there's none!)</h2>
+    <p>File a bug report.</p>
   </body>
 </html>