[Webkit-unassigned] [Bug 196203] New: [CSS3 Values] ch unit with text-orientation and vertical writing modes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=196203

            Bug ID: 196203
           Summary: [CSS3 Values] ch unit with text-orientation and
                    vertical writing modes
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: macOS 10.13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: browserbugs2 at gtalbot.org

{
ch unit
    Equal to the used advance measure of the "0" (ZERO, U+0030) glyph found in the font used to render it. (The advance measure of a glyph is its advance width or height, whichever is in the inline axis of the element.)

    Note: The advance measure of a glyph depends on writing-mode and text-orientation (...)
}
CSS3 Values and Units, section 5.1.1 Font-relative lengths: the em, ex, ch, rem units
https://www.w3.org/TR/css-values-3/#ch


Tests
-----

In 'vertical-rl' writing mode with 'text-orientation: upright', the ch unit is equal to the used vertical advance measure of the 0 (ZERO, U+0030) glyph
http://w3c-test.org/css/css-values/ch-unit-002.html

In 'vertical-rl' writing mode with 'text-orientation: mixed', the ch unit is equal to the used horizontal advance measure of the 0 (ZERO, U+0030) glyph
http://w3c-test.org/css/css-values/ch-unit-003.html

In 'vertical-rl' writing mode with 'text-orientation: sideways', the ch unit is equal to the used horizontal advance measure of the 0 (ZERO, U+0030) glyph
http://w3c-test.org/css/css-values/ch-unit-004.html

In 'vertical-rl' writing mode with 'text-orientation: mixed', the ch unit is the advance width measure of the 0 (ZERO, U+0030) glyph
http://w3c-test.org/css/css-values/ch-unit-010.html

In 'vertical-rl' writing mode with 'text-orientation: upright', the ch unit is the advance height measure of the 0 (ZERO, U+0030) glyph
http://w3c-test.org/css/css-values/ch-unit-011.html

In 'vertical-rl' writing mode with 'text-orientation: sideways', the ch unit is the advance width measure of the 0 (ZERO, U+0030) glyph
http://w3c-test.org/css/css-values/ch-unit-012.html

These 6 tests fail in latest stable Safari 12 and in latest Safari Technology Preview. 

Firefox 68 and Epiphany Technological Preview 3.31.90-8061c1929 (WebKitGTK 2.24.0) pass these 6 tests. 

I searched for duplicates and did not find any. This is not a duplicate of bug 85755.

Unfortunately, I do not have and do not use and do not have access to Mac OS X or to latest stable Safari 12 or to latest Safari Technological Preview; I was informed by Florian Rivoal about these test results.

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