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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Defining Font Size Using EM</title> <style> h1 { font-size: 2em; /* 32px/16px=2em */ } p { font-size: 0.875em; /* 14px/16px=0.875em */ } </style> </head> <body> <h1>This is a heading</h1> <p>This is a <span>paragraph</span>.</p> </body> </html>
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