Check Your Screen for Dead & Stuck Pixels Test your screen for dead or stuck pixels by cycling through full-screen solid colors.

The tool utilizes React's useState and useCallback hooks to manage its state and handle user interactions, such as cycling through colors and toggling full screen mode. It employs the Fullscreen API to enter full screen mode, ensuring complete pixel coverage by setting the background color of a full-viewport div element. This div is assigned an aria-label attribute for accessibility purposes, providing a description of the current color being displayed. The tool's color cycling mechanism relies on an array of color objects, each containing a name and hex value, which are used to update the background color of the full-viewport div. When a user presses the arrow keys or space bar, the tool updates the color index state variable, triggering a re-render with the new color.

Under the hood, the tool listens for keyboard events using the addEventListener method, allowing it to capture key presses such as Escape, ArrowRight, and ArrowLeft. It also uses the fullscreenchange event to detect when the user exits full screen mode, at which point it updates the isFullscreen state variable accordingly. The tool's custom color selection feature relies on HTML5's input type="color" element, which provides a built-in color picker interface for users to select a specific hex code. This value is then stored in the customColor state variable and used to update the background color of the full-viewport div when the user chooses to use a custom color.

In terms of data structures, the tool uses an array to store its list of predefined colors, each represented as an object with name and value properties. It also employs JavaScript's modulo operator to cycle through this array when the user presses the arrow keys or space bar, ensuring that the color index wraps around to the beginning of the array when it exceeds the maximum index. By leveraging these technologies and data structures, the tool provides a simple yet effective way to identify dead pixels on a display.