[jlreq] Mention page size in the gap analysis? (#235)

xfq has just created a new issue for https://github.com/w3c/jlreq:

== Mention page size in the gap analysis? ==
I recently discovered that CSS supports the JIS B5/B4 page size: https://drafts.csswg.org/css-page-3/#typedef-page-size-page-size

Since we have a chapter for [Page & book layout](https://w3c.github.io/jlreq/gap-analysis/#h_pages) in the gap analysis, I wonder if we can add some content about this?

I did some preliminary investigations:

* WPT tests
  * [JIS B5](http://wpt.live/css/css-page/page-size-011.xht) ([source](https://github.com/web-platform-tests/wpt/blob/master/css/css-page/page-size-011.xht))
  * [JIS B4](http://wpt.live/css/css-page/page-size-012.xht) ([source](https://github.com/web-platform-tests/wpt/blob/master/css/css-page/page-size-012.xht))

* Implementations
  * [AH Formatter](https://www.antenna.co.jp/AHF/help/v70/ahf-ext.html#axf.size) supports it
  * [Vivliostyle](https://docs.vivliostyle.org/#/supported-css-features#css-paged-media-3-2) supports it
  * [Prince](https://www.princexml.com/doc/page-size-keywords/) does not support it

Please view or discuss this issue at https://github.com/w3c/jlreq/issues/235 using your GitHub account


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Received on Wednesday, 19 August 2020 10:04:04 UTC