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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Defining Font Size Using Viewport Units</title> <style> body { font-size: 1vw; } h1 { font-size: 3vw; } </style> </head> <body> <h1>This is a heading</h1> <p>This is a paragraph.</p> </body> </html>
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