#726168 why do wide commas look like narrow commas at larger font sizes?

Package:
fonts-arphic-uming
Source:
fonts-arphic-uming
Submitter:
Date:
2013-10-13 00:21:06 UTC
Severity:
normal
#726168#5
Date:
2013-10-13 00:12:25 UTC
From:
To:
Why does
",，,，,，,，,，,，"
in an html document,
all look like
",,,,,,,,"
in Firefox 27
after hitting several CTRL+++++ ?