jpan ja printedmatter vertical-text

[xfq]

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tag: vertical-text The characters under 規則 are rotated 90 degrees.
source: 令和2年06月05日の三重県公報 (Newsletter from the Mie Prefecture Government, June 5 2020)

[xfq]

I'm not sure what labels should be used, adding pending for now.

[r12a]

Is this rotation applied because they are unable to create vertical text (ie. observable but not to be repeated)? Or is it something that is a common and intentional layout?

[gminky]

官報や公報では、全体の縦書き/横書きを統一するために、文字の回転が行われます。

Google Translate

In the official gazette, the characters are rotated to unify the vertical writing/horizontal writing.

[himorin]

It's actually quite complex rules and customary law. You may find more complex example in official gazette (I'll send one via email later, which is not allowed to paste here due to its license.)
I seek various laws and rules (after issue was raised to csswg), but haven't found solid one yet, and now asking to several people in government and/or city offices.

[gminky]

(参考)
三重県の条例等一部改正のマニュアル。
P.15・16 参照。

https://commons.wikimedia.org/wiki/File:%E6%96%B0%E6%97%A7%E5%AF%BE%E7%85%A7%E8%A1%A8%E6%96%B9%E5%BC%8F%E3%81%AB%E3%82%88%E3%82%8B%E6%9D%A1%E4%BE%8B%E7%AD%89%E3%81%AE%E4%B8%80%E9%83%A8%E6%94%B9%E6%AD%A3%E3%81%AB%E3%81%A4%E3%81%84%E3%81%A6%EF%BC%88%E3%83%8D%E3%83%83%E3%83%88%E3%83%95%E3%82%A9%E3%83%AB%E3%83%80%E6%8E%B2%E8%BC%89%E8%B3%87%E6%96%99%EF%BC%89%EF%BC%88%E5%B9%B3%E6%88%9030%E5%B9%B412%E6%9C%88%EF%BC%91%E6%97%A5%E4%B8%89%E9%87%8D%E7%9C%8C%E7%B7%8F%E5%8B%99%E9%83%A8%E6%B3%95%E5%8B%99%E3%83%BB%E6%96%87%E6%9B%B8%E8%AA%B2%EF%BC%89.pdf