<html xmlns="http://www.w3.org/1999/xhtml"> <head> </head> <body>  <title> </title> </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