Bugzilla

"
ic unit
    Equal to the used advance measure of the “水” (CJK water ideograph, U+6C34) glyph found in the font used to render it.

    This measurement is a typically an exact measure (in the few fonts with proportional fullwidth glyphs, an approximation) of a **single fullwidth glyph’s advance measure**, thus allowing measurements based on an expected glyph count.

    In the cases where it is impossible or impractical to determine the ideographic advance measure, it must be assumed to be 1em.
"
CSS4 Values and Units, 6.1.1. Font-relative lengths section, ic unit
https://www.w3.org/TR/css-values-4/#ic


9 Tests
-------

In horizontal-tb writing-mode:
http://w3c-test.org/css/css-values/ic-unit-001.html

With text-orientation: upright; and writing-mode: vertical-rl;
http://w3c-test.org/css/css-values/ic-unit-002.html

With text-orientation: mixed; and writing-mode: vertical-rl;
http://w3c-test.org/css/css-values/ic-unit-003.html

With text-orientation: sideways; and writing-mode: vertical-rl;
http://w3c-test.org/css/css-values/ic-unit-004.html

In horizontal-tb writing-mode:
http://w3c-test.org/css/css-values/ic-unit-008.html

With (initial) text-orientation: mixed; and writing-mode: vertical-rl;
http://w3c-test.org/css/css-values/ic-unit-009.html

With text-orientation: mixed; and writing-mode: vertical-rl;
http://w3c-test.org/css/css-values/ic-unit-010.html

With text-orientation: upright; and writing-mode: vertical-rl;
http://w3c-test.org/css/css-values/ic-unit-011.html

With text-orientation: sideways; and writing-mode: vertical-rl;
http://w3c-test.org/css/css-values/ic-unit-012.html


- Right now, no browser supports any of these 9 tests
- I searched for duplicate and did not find any.

"
ic unit
    Equal to the used advance measure of the “水” (CJK water ideograph, U+6C34) glyph found in the font used to render it.

This measurement is a typically an exact measure (in the few fonts with proportional 
fullwidth glyphs, an approximation) of a **single fullwidth glyph’s advance measure**, 
thus allowing measurements based on an expected glyph count.

In the cases where it is impossible or impractical to determine the ideographic advance
measure, it must be assumed to be 1em.
"
CSS4 Values and Units, 6.1.1. Font-relative lengths section, ic unit
https://www.w3.org/TR/css-values-4/#ic


9 Tests
-------

In horizontal-tb writing-mode:
http://w3c-test.org/css/css-values/ic-unit-001.html

With text-orientation: upright; and writing-mode: vertical-rl;
http://w3c-test.org/css/css-values/ic-unit-002.html

With text-orientation: mixed; and writing-mode: vertical-rl;
http://w3c-test.org/css/css-values/ic-unit-003.html

With text-orientation: sideways; and writing-mode: vertical-rl;
http://w3c-test.org/css/css-values/ic-unit-004.html

In horizontal-tb writing-mode:
http://w3c-test.org/css/css-values/ic-unit-008.html

With (initial) text-orientation: mixed; and writing-mode: vertical-rl;
http://w3c-test.org/css/css-values/ic-unit-009.html

With text-orientation: mixed; and writing-mode: vertical-rl;
http://w3c-test.org/css/css-values/ic-unit-010.html

With text-orientation: upright; and writing-mode: vertical-rl;
http://w3c-test.org/css/css-values/ic-unit-011.html

With text-orientation: sideways; and writing-mode: vertical-rl;
http://w3c-test.org/css/css-values/ic-unit-012.html


- Right now, no browser supports any of these 9 tests
- I searched for duplicate and did not find any.