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<!DOCTYPE html> <html> <head> <style> body { font-size: 100%; } h1 { font-size: 2.5em; } h2 { font-size: 1.875em; } p { font-size: 0.875em; } </style> </head> <body> <h1>This is heading 1</h1> <h2>This is heading 2</h2> <p>This is a paragraph.</p> <p>Specifying the font-size in percent and em displays the same size in all major browsers, and allows all browsers to resize the text!</p> </body> </html>