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Old 01-22-2024, 03:01 AM   #1
iouzzr
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Exclamation The same font size appears differently in the viewer and editor's preview.

1. I set font size to 20px in the viewer:
Click image for larger version

Name:	屏幕截图 2024-01-22 155558.png
Views:	78
Size:	134.0 KB
ID:	205965

2. I set font size to 20px in the editor's preview (default font size):
Click image for larger version

Name:	屏幕截图 2024-01-22 155437.png
Views:	49
Size:	49.7 KB
ID:	205966

3. They are clearly different from each other:
Click image for larger version

Name:	屏幕截图 2024-01-22 155540.png
Views:	46
Size:	276.7 KB
ID:	205967

Last edited by pdurrant; 01-22-2024 at 08:16 AM.
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Old 01-22-2024, 03:36 AM   #2
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preview settings only apply if the book defines no styles of its own.
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Old 01-22-2024, 08:37 PM   #3
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Quote:
Originally Posted by kovidgoyal View Post
preview settings only apply if the book defines no styles of its own.
But by changing the preview font size settings, the actual font size surely becomes larger or smaller. I don't know CSS, but at least with same font size settings, they should have same font size.
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Old 01-22-2024, 09:21 PM   #4
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I make a comparison using Calibre viewer, editor's preview and Sigil's preview. The font size is set to 20. The actual font size for Calibre editor's preview and Sigil is the same. Calibre viewer's actual font size is smaller compared to these two.
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Old 01-22-2024, 09:31 PM   #5
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Quote:
Originally Posted by iouzzr View Post
But by changing the preview font size settings, the actual font size surely becomes larger or smaller. I don't know CSS, but at least with same font size settings, they should have same font size.
Have you looked at the CSS of the ebook to see how the font-size is arrived at? Also note preview in the editor only uses that font size when the ebook CSS/inline styles do not define a font size.
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Old 01-22-2024, 09:37 PM   #6
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The viewer imposes the users font size preferences, scaling all fonts according to those preferences. The preview does not. You will not in general get the same font size between the two.
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Old 01-22-2024, 10:58 PM   #7
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Quote:
Originally Posted by DNSB View Post
Have you looked at the CSS of the ebook to see how the font-size is arrived at? Also note preview in the editor only uses that font size when the ebook CSS/inline styles do not define a font size.
I extract the .epub and open the chapter using my browser. I inspect the yellow highlighting part:

So I think this part of CSS is controlling the font-size:
code {
font-family: Courier, Courier New, monospace;
font-size: small;
}

So if I set "default font size" to 20 in the Calibre editor preview's settings, the font size of the "code" part will be smaller than 20?

---------

"Also note preview in the editor only uses that font size when the ebook CSS/inline styles do not define a font size."

I don't quite understand. Does the above "code" CSS qualified as "ebook CSS/inline styles define a font size"?

P.S. I uploaded the CSS and HTML to ch06.zip.
Attached Thumbnails
Click image for larger version

Name:	屏幕截图 2024-01-23 114413.png
Views:	25
Size:	333.3 KB
ID:	205981  
Attached Files
File Type: zip ch06.zip (50.3 KB, 80 views)

Last edited by theducks; 01-23-2024 at 01:47 PM. Reason: inline large image removed
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Old 01-22-2024, 11:03 PM   #8
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Quote:
Originally Posted by kovidgoyal View Post
The viewer imposes the users font size preferences, scaling all fonts according to those preferences. The preview does not. You will not in general get the same font size between the two.
When you say "the users font size preferences", are you referring to the settings below?
Moderator Notice
Please read the MR Guidelines about inline image sizes .Use attachments for larger sizes


I am confused, why this font size setting uses absolute unit "px", while you are saying that "scaling all fonts" which implies that this is a relative unit?
Attached Thumbnails
Click image for larger version

Name:	屏幕截图 2024-01-22 155558.png
Views:	40
Size:	134.0 KB
ID:	205983  

Last edited by theducks; 01-23-2024 at 01:49 PM. Reason: remove oversize inline images
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Old 01-22-2024, 11:05 PM   #9
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Because there can be more than one font size ina document. That setting sets the base font size, all other font sizes are scaled relatively to it.
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Old 01-23-2024, 08:28 PM   #10
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Put the mouse pointer over the preview. Use control-mouse wheel to change the size.
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