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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1.0"> </head> <body> <picture> <source srcset="img_smallflower.jpg" media="(max-width: 400px)"> <source srcset="img_flowers.jpg"> <img src="img_flowers.jpg" alt="Flowers" style="width:auto;"> </picture> <p>Resize the browser width and the background image will change at 400px.</p> </body> </html>