11862 - [PP] 'ex' length measurement is smaller on Mac

Status: VERIFIED FIXED

(Core :: CSS Parsing and Computation, defect, P3)

Description

[Christine Hoffman]

Using 8/13 Apprunner on Win 95, Win NT, Win 98, Mac8.5 and Linux 5.2 RedHat
(don't have 6.0 installed yet)

Open attached file. There are eight boxes assigned different measurement units
for padding.

Expected results: The boxes should be very close to the same size (measurements
equalized)
Actual results:

Mac8.5: the 'ex' box is noticably smaller
Win 95, Win 98, Win NT, Linux: okay

On Mac8.5, this bug is prevalent across all CSS1 properties that have an 'ex'
length value

Comment 1

[Christine Hoffman]

Attachment: Test case to demonstrate problem

Comment 2

[Christine Hoffman]

Attachment: Revised test case assigning a specific font size

Comment 3

[Peter Linss]

Looks like the font metrics on the mac has bad xheight.

Comment 4

[Mike Pinkerton (not reading bugmail)]

how did font metrics end up on my plate? assigning back to gecko team.

Comment 5

[rickg]

Pierre -- can you please look into this issue?

Comment 6

[Pierre Saslawsky]

Fixed. I changed to ratio of lowercase/uppercase to 5/7 = 0.71. The other
platforms use lowercase/maxascent = 5/9 = 0.56.

Comment 7

[Christine Hoffman]

Using 9/16 Apprunner on Mac8.5, looks better. Verifying bug fixed.