Draw across the screen and use several fingers to find missed touches, dead zones or multi-touch problems.
The active area listens for pointer or touch input and shows a marker for each contact while it is held down. Drag one finger slowly across several parts of the surface and repeat suspicious locations; multi-touch checks whether separate fingers are reported at the same time.
A missing contact is not always a broken sensor. A screen protector, moisture, gloves, palm rejection, browser gestures or a dirty surface can interfere. Rotate the device and repeat the same physical area to distinguish a page-layout edge from a location on the digitizer.
A marker should continue following a finger that remains on the glass. Repeated disappearance at one physical spot deserves comparison after rotating the device.
A repeatable gap in the same screen location across orientations can indicate a protector, digitizer or edge-rejection issue.
Supported fingers should appear separately. The maximum count depends on the hardware, driver, operating system and browser.
Operating-system navigation gestures and palm rejection can reserve contacts near the bezel before the web page receives them.
A browser sees processed touch events, not the raw digitizer grid, pressure calibration or electrical noise. This test cannot certify stylus precision, repair a dead zone or override system gestures.
Read our complete testing methodology →It can help reveal an area that consistently misses or drops touches, but it cannot distinguish a hardware fault from an operating-system or browser issue.
Your device, browser or accessibility settings may limit multi-touch input. Try another browser and confirm multi-touch support in the device specifications.
It can visualize a repeatable area that stops reporting touch, but it cannot determine whether the cause is the digitizer, connector, protector or software.
System navigation and palm-rejection logic often reserve edge gestures, so those contacts may never be delivered to the page.
The current test focuses on contact position and continuity. Stylus pressure and tilt support vary and are not a reliable cross-device diagnostic here.