<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <first-test><div>1</div></first-test>
    <second-test>
      <div>2</div>
      <div></div>
    </second-test>
  </body>
</html>