445905 - window.innerWidth / document.documentElement.clientWidth never return less than 688

Status: RESOLVED DUPLICATE of bug 391358

(Firefox :: General, defect)

Description

[Jeff Sonstein]

User-Agent:       Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.0.1) Gecko/2008070206 Firefox/3.0.1
Build Identifier: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.0.1) Gecko/2008070206 Firefox/3.0.1

getting viewport width works fine, until <= 688 wide; never reports smaller than 688. example page at http://ariadne.iz.net/~jeffs/test/viewportWidthTest.html just for demo of this problem. Pages that gracefully change themselves to accomodate large and small displays no longer work due to this (see http://chw.rit.edu/ for example that used to work in FF 2.x).

Reproducible: Always

Steps to Reproduce:
1. go to http://ariadne.iz.net/~jeffs/test/viewportWidthTest.html
2. resize screen
3. never reports less than 688 wide
Actual Results:  
never thinks it is narrower than 688

Expected Results:  
should return current viewport width, even when narrower than 688

worked in FF 2.x  now breaks pages that gracefully enhance based on display size

Comment 1

[Mats Palmgren (inactive)]

Without any add-ons I can get it to 431 on MacOSX and to zero on Linux.