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<!DOCTYPE html> <html> <head> <style> h1 { text-decoration-line: underline; text-decoration-thickness: auto; /* this is default */ } h2 { text-decoration-line: underline; text-decoration-thickness: 5px; } h3 { text-decoration-line: underline; text-decoration-thickness: 25%; } p { text-decoration-line: underline; text-decoration-color: red; text-decoration-style: double; text-decoration-thickness: 5px; } </style> </head> <body> <h1>Heading 1</h1> <h2>Heading 2</h2> <h3>Heading 3</h3> <p>A paragraph.</p> </body> </html>
