Thank you for the clarification.
The bit about MS Gothic reminds me why we seem to have rather classic
feel to the monospace font web rendering, I suppose.
On 2017/08/24 11:45, Masayuki Nakano wrote:
Ah, yes, this change is only on Windows (only on Windows, we still use
legacy Japanese fonts as default settings).
FYI: We still need to keep using legacy "MS Gothic" font for default
Japanese monospace font since Windows doesn't have modern monospace font.
On 8/24/2017 7:47 AM, ISHIKAWA,chiaki wrote:
Hi,
I use firefox under Windows most of the time, and so it will be very
nice.
But obviously this is only for Windows platform, and
does not affect linux or OSX versions. Correct?
On 2017/08/23 14:19, Masayuki Nakano wrote:
Hi,
We decided that we should change our default Japanese fonts from
legacy "MS PGothic" (sans-serif) and "MS PMincho" (serif) which have
bitmap glyph to modern "Meiryo" or "Yu Gothic" (sans-serif) and "Yu
Mincho" (serif).
This has been enabled on Nightly and early Beta since 55 [1].
Then, I removed the |#ifdef EARLY_BETA_OR_EARLIER| in Nightly
yesterday [2]. I.e., the new default settings are enabled on release
build starting from 57.
I'd like to introduce some backgrounds:
"Meiryo" is installed on Vista or later (but not installed on Win10
unless you add Japanese in system language settings). "Yu Gothic" and
"Yu Mincho" is installed on Win8.1 or later.
Both Edge and Chrome already started to use "Meiryo" as their default
Japanese fonts. So, using "Meiryo" improves the compatibility between
browsers and just looks better and is easier to read than bitmap glyph.
One of the reason why we didn't use "Meiryo" as default fonts is,
"Meiryo" has normal style glyph as italic style glyph. E.g.,
|a<i>b</i>c| looks like |abc|, not |a/b/c|. The other browsers have
this issue, but I see many users who complain about this issue. For
solving this issue, we added a hack to ignore italic style family of
"Meiryo" at loading fonts [3]. So, now, Gecko is the only one engine
which supports italic style Japanese text with default fonts!
On the other hand, there are still some problems.
"Meiryo" has too big internal leading for supporting accent marks of
Western languages. This causes increasing normal line height than
other fonts. Additionally, Gecko's normal line height computation is
not same as the other browsers. Therefore, this may cause
compatibility issue with the other browsers. For example, our <input>
allows to scroll its content. Therefore, if user drags text in
<input> vertically, the text may be scrolled [4].
If we could use "Yu Gothic" as Japanese default font, it'd be really
nicer except compatibility with the other browsers because it has
nicer glyph than "Meiryo" ("Meiryo" was designed for UI, not for
document. Therefore, it was designed as easier to read even if the
font size is small) and does not have too big leading like "Meiryo".
However, there is a big problem. Text renderer of Windows has a bug.
Text of "Yu Gothic" is rendered as too light [5]. So, the contrast
between text and background color may not be enough for some users.
Therefore, currently, we use "Yu Gothic" as a fallback font only when
"Meiryo" isn't available.
Anyway, I believe that this makes 57 look nicer for Japanese users!
[1] https://bugzilla.mozilla.org/show_bug.cgi?id=548311
[2] https://bugzilla.mozilla.org/show_bug.cgi?id=1354004
[3] https://bugzilla.mozilla.org/show_bug.cgi?id=1351332
[4] https://bugzilla.mozilla.org/show_bug.cgi?id=1378065
[5] https://bug548311.bmoattachments.org/attachment.cgi?id=8848439
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