Learn HTML by Building a Cat Photo App - Step 1

I am at the very beginning, have followed instructions but the code is unsuccessful. Erro: “Sorry, your code does not pass. Keep trying.”
What could I be doing wrong? Note, I am using my phone, is there something I perhaps need to or change on settings first?

  **Your code so far**
<html>
<body>
  <CatPhotoApp>Hello World</CatPhotoApp>
</body>

this is not a valid html tag, you will need to reset the step, and change the text between the <h1> opening tag and the </h1> closing tag

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