On Mon, 1 Feb 2021 18:15:13 GMT, Alexey Ivanov <aiva...@openjdk.org> wrote:

> It is likely because sun.java2d.uiScale gets applied to both frames. If the 
> font size is the same, 2d surface gets scaled up to the same level, which 
> results in the same size of the frames.
> 
> Yet the calculations of the conversion ratios in CSS depend only on the 
> resolution of the main screen. If the main screen resolution is 96dpi (100% 
> scaling), the font size will be the same as after your fix.

That makes sense.

What should we do about it? Is there a way to inject a different screen 
resolution for testing?
And should I remove `sun.java2d.uiScale` from the doc?

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PR: https://git.openjdk.java.net/jdk/pull/2256

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