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<!DOCTYPE html> <html> <head> <style> div { font-size: 30px; border: 1px solid black; } span { font-size: 1ex; } </style> </head> <body> <div>The font-size of the div element is set to 20px. <span>The span element inside the div element has a font-size of 1ex</span>.</div> </body> </html>