Data Visualization with D3 - Add Document Elements with D3

**when i use run button eveything being close when i use reset for learning area tell me that dou want to close how can i use run button **
Describe your issue in detail here.

  **can you tell me which button i use for learning area for codes i push to wrong button and i couldn't change the area for the first time **
<body>
<script>
  // Add your code below this line
This is not a code problem this is learning area problem


  // Add your code above this line
</script>
</body>

Thank you for help

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Challenge: Data Visualization with D3 - Add Document Elements with D3

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