309103 - Display Resolution setting has no effect in Firefox (1.0 and 1.5b1)

Status: RESOLVED DUPLICATE of bug 69205

(Core Graveyard :: GFX, defect)

Description

[Michael Kraft [:morac]]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.10) Gecko/20050720 Firefox/1.0.6 (mmoy CE 1.0.6 K8B-X34)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.10) Gecko/20050720 Firefox/1.0.6 (mmoy CE 1.0.6 K8B-X34)

I run my screen resolution at 1920x1200 and changed the DPI settings in windows
to 120 which changes some elements of Firefox (windows gui elements like menu
text and the like), but other things aren't affected.  This causes problems like
text not fitting in windows (mostly for extension option windows).

So I changed the Display resolution (browser.display.screen_resolution) from 96
to 120 hoping that it would act similarly and increase the size of elements in
the firefox browser and on web pages.

I restarted Firefox and everything looks exactly the same.  Every web page I've
been to looks exactly the same.  Setting the Display Resolution to 120 did
absolutely nothing.

I somewhat worked around this by changing the minimuum font size to 14, but that
only works on web pages and only affects text.

I've tried this in Firefox 1.0.6 and Firefox 1.5b1 with the same results.


Reproducible: Always

Steps to Reproduce:
1. Browse to any web page
2. Change browser.display.screen_resolution preference from default of 96 to 120.
3. Restart browser
4. Go back to the webpage from #1
Actual Results:  
There was no size scaling in either the web page or the browser itself.

Expected Results:  
Everything should be 125% larger as compared to the 96 DPI setting

Comment 1

[zug_treno]

Related to Suite bug 69205?

Comment 2

[Felix Miata]

Attachment: 96 DPI Firefox Beta 1 screenshot

Note the 16 pixel line of text near the middle.

Comment 3

[Felix Miata]

Attachment: 120 DPI Firefox Beta 1 screenshot

Note the 16 pixel line of text near the middle of the 96 DPI screenshot is
exactly the same size as this one. That's because the pixel and relative text
sizing methods on web pages depend in no way upon the DPI your system is set
to. Only physical unit sizing methods, such as points, are so dependant, and
thus change according to your system DPI. The browser controls are sized in
points, and thus vary with system DPI.

So, the claim that "Every web page I've been to looks exactly the same." is
pretty much as expected, as physical units are not appropriate for sizing text
for screen media. Some pages, as
http://members.ij.net/mrmazda/auth/PointsDemo.html in the screenshot, do use
points, and thus are affected by a system DPI change. Note that
http://members.ij.net/mrmazda/auth/dpi-screen-window.html also in the
screenshots is not impacted by DPI.

That changing the pref browser.display.screen_resolution on the w32 platform
has no effect is a bug 69205 dupe.

Comment 4

[Felix Miata]

*** This bug has been marked as a duplicate of 69205 ***