[Solved] How to put HTML, CSS and JS in one single file

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you cannot save all the file extension into one single file. Css is .css, Javascript is .js.
but you can link all those files into your html 

   <link rel="stylesheet" type="text/css" href="https://stackoverflow.com/questions/47306539/yourcssfile.css">

for javascript

  <script src="https://stackoverflow.com/questions/47306539/yourjsfile.js"></script>

solved How to put HTML, CSS and JS in one single file