[Webkit-unassigned] [Bug 237330] New: A text node longer than 65, 535 characters following another text node is invisible in a scrolling context

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=237330

            Bug ID: 237330
           Summary: A text node longer than 65,535 characters following
                    another text node is invisible in a scrolling context
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Mac (Apple Silicon)
                OS: macOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jed at jedfox.com

Created attachment 453507

  --> https://bugs.webkit.org/attachment.cgi?id=453507&action=review

HTML file with sample code that does and does not trigger the bug

I’ve narrowed the reproduction down to the following specific requirements:

- A parent node must have `overflow: auto` (not necessarily the immediate parent of the text node)
- The text node must not be the first node on its line (taking word wrapping into account)
- The text node must have at least 65,536 characters (I tested with the ASCII 0, although it seems that other characters can be present)

Encountered in the wild: https://github.com/facebook/jsx/pull/136#issuecomment-1055288199

Reproduced on STP Release 140 (Safari 15.4, WebKit 17614.1.1.5) and WebKit r290647 on macOS 12.2.1 (21D62)

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