Re: [editing] What browser internals can be exposed to help us move the caret in (and against) the block direction? (#56)

> According to my Japanese contact, writing text in Japanese on the web currently still works mainly in the European ltr horizontal writing mode. Is that correct? Can you explain why it would make things worse to expose the information about where the caret actually is?

While it's true that most of text editors on the Web use horizontal writing mode, every popular word processing applications such as Microsoft Word on Desktop supports vertical writing mode since most of books and newspapers sold in Japan and Taiwan are still written vertically.  This is one area the Web is seriously lagging behind their native equivalents.  Since the whole point of this new API is to allow more apps and use cases, I don't think we should be aiming the low which is the current status quo.

As to why such an API makes worse for vertical writing mode, the problem is that the caret rect is shown as a horizontal bar in vertical writing mode, and depending on whether the block direction is from left to right (Mongolian) or right to left (Chinese/Japanese), such a tooltip must be shown on the left or the right of the caret respectively.



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