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<!DOCTYPE html> <html> <head> <style> h1 { border-style: solid; border-width: 15px; } div { border-style: solid; border-width: 15px; } </style> </head> <body> <h1>A heading with a 15px thick border</h1> <div>A div element with a 15px thick border.</div> <p><strong>Note:</strong> The border-width property does not work if it is used alone. Use the border-style property to set the border first.</p> </body> </html>
