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Re:Sizzy – The Browser for Developers by sam_bristow on Thursday October 15, 2020 @10:35PM (#24796860)
From the FAQ way down the bottom of the page:

"""

Will I get the same result as I would on a real device?

Sizzy simulates the viewport and user agent of each device, so the results should be the same as what you would see on a real device.

However, Sizzy cannot simulate different browser rendering engines, so there's a chance that there might be some minor differences when testing on a real device.

"""

Re:Sizzy – The Browser for Developers by paledot on Thursday October 15, 2020 @11:00PM (#24797010)
"Exactly the same, except for the thing that makes them fundamentally different. Nothing we can do about that."