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<!DOCTYPE html> <html> <head> <style> /* Focusing the button with a keyboard shows a solid red line. */ button:focus-visible { outline: 2px solid red; } /* Focusing the button with a mouse or touch shows a drop shadow. */ button:focus { box-shadow: 1px 1px 6px rgba(255, 0, 0, 0.5); } </style> </head> <body> <h1>Demo of :focus-visible</h1> <p>Use the keyboard to tab to the button.</p> <p>Then use the mouse to click the button.</p> <button>Click me</button> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>