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Re:How Browsers Lay Out Web Pages by ksec on Tuesday April 06, 2021 @04:19AM (#26709401)
> Elements like <body> and <header> contain blocks stacked vertically. But elements like <p> and <h1> contain text and lay that text out horizontally in lines. ( In European languages, at least! )

Another day, another features despite PDF not being perfect, is still miles ahead of HTML. I am not even sure if there are any intention to bring vertical Japanese subtext feature to HTML.

Re:How Browsers Lay Out Web Pages by nicoburns on Tuesday April 06, 2021 @04:35AM (#26709500)
Re:How Browsers Lay Out Web Pages by darrenf on Tuesday April 06, 2021 @11:17AM (#26712867)
> I am not even sure if there are any intention to bring vertical Japanese subtext feature to HTML.

Perhaps not HTML itself, but the first draft for writing modes in CSS is over 10 years old: https://www.w3.org/TR/2010/WD-css3-writing-modes-20101202/

> This module specifies the text layout model in CSS and the properties that control it. It covers bidirectional and vertical text.

There have been numerous revisions in the subsequent years. In 2017 w3.org published this article specifically on using vertical text in paragraphs, forms, lists and tables: https://www.w3.org/International/articles/vertical-text/