of the Other Symbols (<code>So</code>) <a>general category</a> and Common <a lt="Unicode script">script</a>.

The UA may use a glyph provided by a font specifically for the control character,

substitute the glyphs provided for the corresponding symbol in the Control Pictures block,

or use some other method to provide an appropriate visible glyph.

As required by [[!UNICODE]],

unsupported <code>Default_ignorable</code> characters must be ignored for rendering.

only create distinctions in CJK text:

unless the writing system is tagged as

<a for=writing-system>Chinese</a> or <a for=writing-system>Japanese</a>,

Future levels may add additional specific rules

for other writing systems and languages

as their requirements become known.

in CSS typesetting:

<dl export>

<dt><dfn lt="Unicode East Asian Width|East Asian Width property"><a href="http://www.unicode.org/reports/tr11/#Definitions">East Asian width property</a></dfn>

and given in the UTR50 data file.

</dl>

it is necessary to determine the properties of a <a>typographic character unit</a>.

For the purposes of CSS Text,

the properties of a <a>typographic character unit</a> are given by