<html> <body> <!-- This is a single-line comment in HTML --> <p>Hello, world!</p> <!-- This is a multi-line comment in HTML --> <p>Comments are ignored</p> </body></html><html> <body> <!-- This is a single-line comment in HTML --> <p>Hello, world!</p> <!-- This is a multi-line comment in HTML --> <p>Comments are ignored</p> </body></html>