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Font size rendering in Calibre Viewer vs. Editor
I notice that fonts that are defined by px or pt instead of em are rendered slightly different by the viewer and the editor.
In the attached picture, both viewer and editor were configured to use 18px as default font on a system set to 96 dpi (so 13.5pt = 18px). While the Calibre editor shows the line using a font size of 1em with the same size as the ones that were using 18px or 13.5pt, the Calibre Viewer in comparison upscales the lines that are using pt or px values by around 15%.
I was wondering what the cause might be, and which one is actually considered correct.
(I included the used epub file for reference.)
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