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 vertical bar pattern object (102x102 pixels) is randomly positioned on the black screen - 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 - Click the contrast display to increase contrast (or Shift+Left-Click anywhere) - Right-click the contrast display to decrease contrast (or Shift+Right-Click anywhere) PATTERN DETAILS: - Bar pattern: 6-pixel vertical period - Initial contrast: 3 gray levels (out of 255) - Object size: 100x100 pixels URL PARAMETERS: Customize the test by adding parameters to the URL: ?contrast=N - Set initial gray level (0-255) [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