[Webkit-unassigned] [Bug 220043] New: iOS 14.3 Safari can't print vertical-rl content correctly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=220043

            Bug ID: 220043
           Summary: iOS 14.3 Safari can't print vertical-rl content
                    correctly
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
                OS: iOS 14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Printing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: myh at outlook.com

Created attachment 416578

  --> https://bugs.webkit.org/attachment.cgi?id=416578&action=review

ost printing previews are blank pages.

I design an ePub viewer app with CSS "writing-mode: vertical-rl" support.
The app also supports content printing.
Chrome 87 on Windows or macOS can correctly print content in both horizontal-tb and vertical-rl modes.
However, iOS 14.3 Safari can't print them correctly in vertical-rl mode. Most printing previews are blank pages. See the attached screenshot.

For example:
1. Open this link:
https://mrmyhuang.github.io/catalog/juan/T0396/1?settings=rtlVerticalLayout=1
2. Click the top right three dots button.
3. Click the item with a printer icon and a label "列印."
4. Check the printing previews...

Please fix the printing support for vertical-rl content.

If anyone needs the app sources for debugging, please follow these steps:
1. Run the bash script:
git clone git at github.com:MrMYHuang/cbetar2.git
cd cbetar2
npm i -D
npm run start

2. Open the link:
http://localhost:3000/catalog/juan/T0396/1?settings=rtlVerticalLayout=1

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