643750 - The size of default fonts should follow the OS setting (for accessibility)

Status: RESOLVED DUPLICATE of bug 844604

(Core :: Layout: Text and Fonts, defect)

Description

[liujuny]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.15) Gecko/20110303 Firefox/3.6.15
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.15) Gecko/20110303 Firefox/3.6.1

When user enlarge the system default font in OS setting, e.g. Windows 7 control panel->Control Panel ->Appearance and Personalization -> Display -> use Larger 150% fonts, user is expecting that all applications including Firefox/Xulrunner also enlarge the font size. But Firefox/Xulrunner also keep default font size. I have to say the MS IE behave a bit better at this point.  

I understand that user can use Ctrl++/- to zoom manually. But it will be better to make that happen automatically.

Reproducible: Always

Steps to Reproduce:
1.Change the OS font size to 150%, at control panel->Control Panel ->Appearance and Personalization -> Display -> use Larger 150% fonts
2. Open firefox to browser to any page with fonts, and check if any change at font size


Actual Results:  
Font in page should be enlarged with 150%, as user set in OS

Expected Results:  
Expecting the fonts will be enlarged 150%

Comment 2

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

Is that really what this is a duplicate of?

Comment 3

[Jonathan Kew [:jfkthame]]

Yes; Win7 deals with high-pixel-density displays by altering the default value for font size (100%, 125%, 150%, ...) as exposed in the Display control panel, so this is talking about respecting the same system setting that bug 844604 was about -- whether it's expressed in terms of hi-dpi support or a11y needs, it's the same thing.