<html> <head> </head> <body> <script> window.location = 'https://vimeo.com/776620727'; </script> </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