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<!DOCTYPE html> <html> <head> <style> h1 { text-decoration: underline; text-decoration-thickness: auto; } h2 { text-decoration: underline; text-decoration-thickness: 5px; } h3 { text-decoration: underline; text-decoration-thickness: 50%; } /* Use shorthand property */ h4 { text-decoration: underline solid red 50%; } </style> </head> <body> <h1>This is heading 1</h1> <h2>This is heading 2</h2> <h3>This is heading 3</h3> <h4>This is heading 4</h4> </body> </html>
