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<!DOCTYPE html> <html> <head> <style> body { background: #f3f3f3 url('img_tree.png'); } </style> </head> <body> <h1>Hello World!</h1> <button type="button" onclick="repeatVert()">Repeat background image only vertically</button> <button type="button" onclick="repeatHori()">Repeat background image only horizontally</button> <script> function repeatVert() { document.body.style.backgroundRepeat = "repeat-y"; } function repeatHori() { document.body.style.backgroundRepeat = "repeat-x"; } </script> </body> </html>