Re: Incompatibility of -epub-text-combine's "Inherited" between EPUB 3.0 and 3.0.1

Hi Sekiguchi-san

Long time no see.
I think text-combine-upright replacing text-combine-horizontal is to keep alignment with CSS update.
In terms of incompatibility between text-combine-upright vs text-combine-horizontal you can check out with Koji or CSS WG.

I don't see any specific place in epub 3.3 to define inherit value for text-combine-upright tho. But yeah, I think the inherited value is depending on CSS definition.

EBPAJ content guideline is old and outdated. There is something else such as text decoration also needs to be fixed in my opinion.

Cheers,
Zheng(Jeff) Xu
Senior Mobile Application Engineer
Toronto, Canada (GMT-5)
[cid:e54e367d-e4a7-44b4-a66b-cb542d2df82e]
www.kobo.com<http://www.kobo.com/>




________________________________
From: Yuki Sekiguchi <yuki.sekiguchi@access-company.com>
Sent: Tuesday, October 6, 2020 5:05 AM
To: public-epub-wg@w3.org <public-epub-wg@w3.org>
Subject: Incompatibility of -epub-text-combine's "Inherited" between EPUB 3.0 and 3.0.1

Hi,

EPUB 3.0 defines -epub-text-combine [1] as an alias of text-combine [2] whose Inherited is no.
IIUC, EPUB 3.0.1 defines -epub-text-combine [3] as an alias of text-combine-horizontal [4] whose Inherited is yes.

The latest EPUB 3.3 [5] is mostly the same as EPUB 3.0.1 except an alias of text-combine-upright [6] instead of text-combine-horizontal.

Is this intentional incompatibility?

There is an EBPAJ's sample EPUB file [7]. Although it just checks how a reading system renders an EPUB and doesn't check conformance, it is famous in Japan and most publishers use it to check reading systems. The EBPAJ's sample has a content to check this "Inherited" behaviour. Then, our customer asked us to fix EPUB 3.0's "Inherited: no".

[1]: http://idpf.org/epub/30/spec/epub30-contentdocs-20111011.html#sec-css-writing-modes
[2]: https://www.w3.org/TR/2011/WD-css3-writing-modes-20110428/#text-combine
[3]: http://idpf.org/epub/301/spec/epub-contentdocs-20140626.html#sec-css-writing-modes
[4]: https://www.w3.org/TR/2012/WD-css3-writing-modes-20121115/#text-combine-horizontal0
[5]: https://w3c.github.io/publ-epub-revision/epub33/core/#sec-css-prefixed-writing-modes
[6]: https://www.w3.org/TR/2012/WD-css3-writing-modes-20121115/#text-combine-horizontal0
[7]: http://ebpaj.jp/counsel/guide

Best regards
Yuki Sekiguchi

.