Closed Bug 1043267 Opened 8 years ago Closed 6 years ago

Wrong page rendrering with minimal font size


(Web Compatibility :: Desktop, defect)

Not set


(Not tracked)



(Reporter: cedric.bellegarde, Unassigned)




(Keywords: testcase, Whiteboard: [country-uk])


(3 files)

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:30.0) Gecko/20100101 Firefox/30.0 (Beta/Release)
Build ID: 20140711112313

Steps to reproduce:

Set minimal font size to 15px

Actual results:

Some page don't render correctly.

See attachements for informations

Expected results:

Goot rendering.
As you see, author text isn't correctly rendered
With Chromium, it works.
Here, no minimal font size in Firefox prefs.

To simulate it, i do this:
gnumdk@arch:~/.mozilla/firefox/wqmug9b3.default/chrome$ cat userContent.css 
* {
        font-size: 1em !important;

And it works, good rendering.
Test site is:
Component: Untriaged → Layout: Text
Keywords: testcase
Product: Firefox → Core
That text is inside an overflow:hidden div with 14px height specified and a 14px line height.

When you set a minimal font-size, that affects line heights as well (see bug 158868 for why), but not heights, of course.  So you end up with a 14px height and a 15px line height, and a 15px font size, leading to the observed rendering.

Chrome doesn't change the line-height when setting a minimal font size, which means it suffers from the problems of bug 158868 and its various duplicates.

I expect this is wontfix, since there's really no way to fix it without regressing bug 158868...  and if the page had used a 12px height to go with their 11px font you would have content cut off no matter what we did with line height; the real issue is the broken fixed height usage. :(
I agree with comment 5. The example is an inflexibly-authored page, and simply doesn't cope well with the browser overriding the font size (e.g. by setting a large minimum size).

(Try setting Chrome's minimum font size to "huge" to see it fail badly there, too; the exact result is different, because as :bz says, Chrome handles minimum-font-size differently, but it's still a broken page.)

As a general rule, it's a bad idea for site authors to apply fixed dimensions to elements that contain text. This is a recipe for poor accessibility (think of readers with limited vision who need to set a very large font size, or just use a different default font that happens to have significantly larger letterforms than the author's).

This is either WONTFIX, or perhaps a case for Tech Evangelism to reach out to the site and suggest they adjust their CSS to be more accommodating.

Moving to product: Tech Evangelism.
Assignee: nobody → english-other
Component: Layout: Text → English Other
Product: Core → Tech Evangelism
Hardware: x86_64 → All
Version: 30 Branch → unspecified
There is no actionable item. There is no site with this specific error. Closing as INCOMPLETE.
Assignee: english-other → nobody
Closed: 8 years ago
Component: English Other → Desktop
Resolution: --- → INCOMPLETE
(In reply to Karl Dubost :karlcow from comment #7)
> There is no actionable item. There is no site with this specific error.
> Closing as INCOMPLETE.

What about the specific site mentioned in comment 4 (and shown in the attached screenshots)? AFAICS it still has this problem as described.
Ever confirmed: true
Resolution: INCOMPLETE → ---
This appears to be fixed now, closing. Testing in FF 48/49 on OSX. Please let me know if you are able to reproduce the issue still.
Closed: 8 years ago6 years ago
Resolution: --- → FIXED
Whiteboard: [country-uk]
Product: Tech Evangelism → Web Compatibility
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