[CSS-UI] caret-shape: block/underscore and overflow #10289
Description
The spec for caret-shape sensibly says that a caret at the end of a text run should paint to the right (in ltr, left in rtl) where the next character in a run would appear. But what should happen if there is no space to put the caret in the container at that location?
Options include:
- Clip the caret.
- Start a new line and put the caret on that line.
- Paint the caret as close as possible to the edge, even if it overlaps the last character in the run.
- Treat the caret as overflow and apply the overflow rules for the container.
Terminal programs on Mac and Linux, the things I can easily check, both exhibit behavior (2). There is no existing browser implementation other than maybe Opera (according to canIuse).
Igalia is considering a chromium implementation and this is a question that immediately comes to mind as a blocker.