Not TestedTesting not done, may not work properly

Browser Features Tools

Browser-native inspectors and interactive testing tools for Browser Features. 100% client-side execution — zero external libraries.

10 Tools Available

Request and exit full-screen presentation mode for document elements.

Prevent screen from dimming or sleeping during active tool usage.

Display system desktop notifications to the user.

Trigger haptic vibration patterns on mobile devices.

Set document badge numbers or indicators on OS taskbar/dock icons.

Detect when the browser tab is hidden or backgrounded.

Open arbitrary HTML element windows in a floating picture-in-picture window.

Native top-layer popover content UI without z-index conflicts.

Animate smooth visual transitions between DOM states.

Control CSS keyframe animation pipelines directly with JavaScript.