No, CAPTCHAs these days track mouse movements and other factors. They make you second guess if something should be included because, as a human, that’s going to be something you do. And it’ll be obvious from both that hesitation and your squishy, inaccurate mouse movements that you’re a human.
They can’t without the given permission from the browser to do so. While they can indeed track the mouse, when they try to access mobile motion sensors (I’m considering a CAPTCHA inside a webpage being accessed through a mobile browser such as Firefox mobile or Chrome for Android), they need to use an HTML5 API that, in turn, will ask the user for permission, something like “This site wants to use sensor motion data. Allow or block?”
No, CAPTCHAs these days track mouse movements and other factors. They make you second guess if something should be included because, as a human, that’s going to be something you do. And it’ll be obvious from both that hesitation and your squishy, inaccurate mouse movements that you’re a human.
Can’t track mouse movements on mobile though
You used to could, on Blackberry at least.
Motion sensor
They can’t without the given permission from the browser to do so. While they can indeed track the mouse, when they try to access mobile motion sensors (I’m considering a CAPTCHA inside a webpage being accessed through a mobile browser such as Firefox mobile or Chrome for Android), they need to use an HTML5 API that, in turn, will ask the user for permission, something like “This site wants to use sensor motion data. Allow or block?”