<html> <head> </head> <body>  <!--DOCTYE html--> <meta charset="utf-8"> <title> ASP2 </title> <p> http://asp2.mg21.jp </p> </body> </html>
You can type viewhtmlonline.com in front of any url you're browsing and it will show you the source.
viewhtmlonline.com
For example: viewhtmlonline.com/https://temp.cool
viewhtmlonline.com/https://temp.cool