This is a good question, and the answer is a bit complex. There is some information that we can get: what browsers they are using, what the screen resolution is, and what the participant's local time is, etc. However, most hardware specs, like those you listed, are not (yet). This is because modern browsers are treated as "sandboxes" for security reasons. Google, Mozilla, Microsoft, etc purposefully hide hardware-level information from web apps to prevent malicious actions that a rogue app may take.
That being said, Google is working on a proprietary API that will expose more hardware details. This is unfortunately a controversial plan and opposed by many in the field, for very good reasons. We are monitoring these developments.
In other words, unfortunately, such hardware-level information cannot be obtained at the time being. Sorry for the disappointing news.
That being said, Google is working on a proprietary API that will expose more hardware details. This is unfortunately a controversial plan and opposed by many in the field, for very good reasons. We are monitoring these developments.
In other words, unfortunately, such hardware-level information cannot be obtained at the time being. Sorry for the disappointing news.