[Webkit-unassigned] [Bug 230348] New: AX: Why does -apple-system-body default to 13px on macOS?

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=230348

            Bug ID: 230348
           Summary: AX: Why does -apple-system-body default to 13px on
                    macOS?
           Product: WebKit
           Version: Safari 14
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sime.vidas at gmail.com
                CC: andresg_22 at apple.com,
                    webkit-bug-importer at group.apple.com

Steps to reproduce:

1. Add this CSS to the page:

  html {
    font: -apple-system-body;
  }

2. Observe that the default text size in Safari on macOS is 13px.

Live demo: https://output.jsbin.com/nofobeh/quiet

Why 13px? That’s a reduction of 3px from the usual default of 16px. This is a problem for websites that want to use -apple-system-body in order to support the text size accessibility preference on iOS. How should such websites handle the 13px default in desktop Safari?

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