RFC 4 · How does text selection work when reading flows top-to-bottom, right-to-left?

[jihoons0]

Labels: RFC interaction

Click-drag selection assumes a left-to-right baseline. In a vertical, RTL layout the selection rectangle has to account for column ordering, column breaks, and tate-chu-yoko groups that behave as a single unit — and native selection often gets this subtly wrong.

Where it shows up here: marker, hyperlink-treatment, and highlighting in Vertically Verse.

Open questions:

• What is the correct visual for a selection that spans a column break in RTL order?
• How should a tate-chu-yoko group select — atomically, or per character?
• Where can we lean on the platform, and where must we override it?

Write-up: https://vertically.works/challenges#selection
Propose your answer as a PR. Strong answers get merged into the spec.