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<html><head><style>button { position: absolute;}button#b1 { top: 20%; left: 25%; nav-index: 1; nav-right: #b2; nav-left: #b4; nav-down: #b2; nav-up: #b4;}button#b2 { top: 40%; left: 50%; nav-index: 2; nav-right: #b3; nav-left: #b1; nav-down: #b3; nav-up: #b1;}button#b3 { top: 70%; left: 25%; nav-index: 3; nav-right: #b4; nav-left: #b2; nav-down: #b4; nav-up: #b2;}button#b4 { top: 40%; left: 0%; nav-index: 4; nav-right: #b1; nav-left: #b3; nav-down: #b1; nav-up: #b3;}</style></head><body><button id="b1">Button 1</button><button id="b2">Button 2</button><button id="b3">Button 3</button><button id="b4">Button 4</button><p><b>Note:</b> The nav- properties are only supported in Opera 12. This property is deprecated in newer versions of Opera. Hold down the Shift key while navigating with the arrow keys.</p></body>