Documentation of selectors starting with -- ?

[Andreas Jung]

Hi there,

the CSS files of the samples directory contain often rules like

--line-height

--margin-block-start

etc.

Where do they come from and where are they documented?

At they do not belong to the EPUB adaptive layout specs...

Andreas

[KAWAKUBO Toru]

Hi,

> At they do not belong to the EPUB adaptive layout specs…

These properties starting with -- are custom properties defined in the following spec:
http://www.w3.org/TR/css-variables-1/

However, the custom properties are currently *not supported* by Vivliostyle.
I included them in the samples with intention to illustrate how you could write styles conveniently *if they were supported* (in some future version of Vivliostyle), but I admit that it is confusing.
I will remove those from the samples. Thank you for pointing out.


--
Toru Kawakubo （川久保 亮）
Vivliostyle Inc.
http://vivliostyle.com

[Florian Rivoal]

Hi,

This syntax is for custom properties, as specified here: https://drafts.csswg.org/css-variables/

However, this is not currently supported in Vivliostyle, so these rules are not taking effect.

 - Florian

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