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<!DOCTYPE html> <html> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <body> <h1 style="font-size:10vw;">Responsive Text</h1> <p style="font-size:5vw;">Resize the browser window to see how the text size scales.</p> <p style="font-size:5vw;">Use the "vw" unit when sizing the text. 10vw will set the size to 10% of the viewport width.</p> <p>Viewport is the browser window size. 1vw = 1% of viewport width. If the viewport is 50cm wide, 1vw is 0.5cm.</p> </body> </html>