809615 - Default Line Height Does Not Scale Proportionally With Font Size

Status: UNCONFIRMED

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

Description

[Ryan Slominski]

Attachment: Resize your window to scale content and watch as at certain sizes the content overflows; compare with IE 9 where content never overflows

Scaling text based on browser window dimensions is not as accurately rendered as in IE 9.  The attached html document resizes the text proportional to window size and maintains a 4:3 aspect ratio content div.  As you resize your browser the content never overflows in IE 9, but will overflow in Firefox 16.2.

Comment 1

[j.j.]

It sometimes overflows with Opera 12.02 and always overflows with Google Chrome with my usual browser settings (changed default fonts).

I assume
 
1) it depends on used fonts
2) your assumptions about font size rounding mechanisms are wrong
3) setting "line-height" explicitly may help

Comment 2

[Ryan Slominski]

Wow, explicitly setting the line-height on the 'ul' to '1em' actually does fix the problem (also fixes it in Chrome and Opera).  Weird.  Thanks.  I guess this may still be a bug though because I would assume the default line height should be changing proportionally as font size changes. 

P.S. - Too bad explicitly setting word spacing doesn't fix this other bug: 807988

Comment 3

[Ryan Slominski]

Attachment: Resize your window to scale content and watch as at certain sizes the content overflows; compare with IE 9 where content never overflows

Updated testcase to report current line height and font size.