[Webkit-unassigned] [Bug 260120] New: No spacing within vertical upright text

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=260120

            Bug ID: 260120
           Summary: No spacing within vertical upright text
           Product: WebKit
           Version: Safari 16
          Hardware: Mac (Apple Silicon)
                OS: macOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ivanglmvc at gmail.com
                CC: mmaxfield at apple.com

Safari displays spacing between words differently when writing-mode is set to a vertical value, for example vertical-lr, and text-orientation is set to upright.
Depending on the font and the ones I tested, it looks like there is no space at all.

I couldn't find anything helpful about this on the web and I am not familiar with font rendering. All I can say is that the spacing looks "correct" in the other major browsers.

Here is a CodePen with a minimal setup where the issue can be seen and tested:
https://codepen.io/glmvc/pen/YzRPoaX

Checked in Safari Version 16.5.2 and Safari Technology Preview Release 176 on macOS Ventura 13.4; and in Safari on iOS Version 16.6.

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