Please ensure the following: Ambient lighting set to reading levels - Close/cover nearby windows - Reduce overhead lighting - Avoid lights reflecting on the display HOW TO USE: - A low contrast bar pattern object is randomly positioned on the display - Try to locate and click on the object - If you click correctly: Success message appears - If you miss: Failure message appears CONTROLS: - Click "Move" to reposition the object - ⟲ or R: Reset contrast and base level, and move the object - ? or H: Show/hide this help - Up Arrow: increase contrast - Down Arrow: decrease contrast - Left/Right Arrow: shift base level (background + object together) - Left-click the contrast display to increase contrast - Right-click the contrast display to decrease contrast - Shift+left-click anywhere: increase contrast - Alt+left-click anywhere: shift base level up - Alt+right-click anywhere: shift base level down PATTERN DETAILS: - Bar pattern: 6-pixel vertical period, in display pixels at any OS scaling - Initial contrast: 3 gray levels (out of 255) - Object size: 102x102 display pixels URL PARAMETERS: Customize the test by adding parameters to the URL: ?contrast=N - Set initial contrast (1-255) [default: 3] - Example: ambtest.html?contrast=10 ?lockcontrast (or ?lock) - Prevent users from changing contrast - Shows lock icon (🔒) next to contrast display - Example: ambtest.html?lockcontrast ?email=address@example.com - Enable email sharing of results - Adds "Share Results" button to success/failure dialogs - Opens email with detailed test report - Example: ambtest.html?email=admin@company.com COMBINED EXAMPLES: - ambtest.html?contrast=5&lock&email=test@example.com - ambtest.html?contrast=20&lockcontrast - ambtest.html?email=results@company.com