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Merge pull request #267 from w3c/only-italic-transform
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re-arrange alphanumerics appendix
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@NSoiffer
NSoiffer authored Nov 25, 2024
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Expand Up @@ -5892,112 +5892,40 @@ <h2>Unicode-based Glyph Assemblies</h2>
<div data-include="tables/unicode-assembly.html"></div>
</section>
</section>
<section>
<section class="informative">
<h3 id="new-text-transform-mappings">Mathematical Alphanumeric Symbols</h3>
<p>
The following tables enumerate the mathematical alphanumeric symbols
<p>As detailed in [[xml-entity-names]] mathematical alphanumeric symbols
with form bold, italic, fraktur, monospace, double-struck etc
that are available in Unicode.
For each of them, the character in its normal form is provided as
well as the difference between the code points of the transformed and
original characters.
</p>
<div class="note">
This difference can be used to simplify implementations. For example
for italic mappings, the code point of a uppercase latin letter is
increased by 0x1D3F3, the code point of a lowercase latin letter is
(generally) increased by 1D3ED, etc and the exceptions can be
handled separately.
</div>
<div class="note">
<p>It is sometimes needed to distinguish between
Chancery and Roundhand style for MATHEMATICAL SCRIPT characters.
These are notably used in LaTeX for the
<code>\mathcal</code> and <code>\mathscr</code> commands.</p>
<p>One way to do that is to rely on
Chapter 23.4 Variation Selectors of
Unicode which describes a way to
specify selection of particular glyph variants [[UNICODE]].
Indeed, the
<code>StandardizedVariants.txt</code> file from the
Unicode Character Database indicates that variant selectors
U+FE00 and U+FE01 can be used on capital script to specify
Chancery and Roundhand respectively.</p>
<p>Alternatively, some
mathematical fonts rely on <code>salt</code> or
<code>ssXY</code> properties from [[OPEN-FONT-FORMAT]]
to provide both styles. Page authors may use the
<a data-xref-type="css-property">font-variant-alternates</a> property with corresponding OpenType font features
to access these glyphs.</p>
</div>
<section class="informative" id="bold-script-mappings">
<h4><code>bold-script</code> mappings</h4>
<div data-include="tables/mathvariants-bold-script.html"></div>
</section>
<section class="informative" id="bold-italic-mappings">
<h4><code>bold-italic</code> mappings</h4>
<div data-include="tables/mathvariants-bold-italic.html"></div>
</section>
<section class="informative" id="tailed-mappings">
<h4><code>tailed</code> mappings</h4>
<div data-include="tables/mathvariants-tailed.html"></div>
</section>
<section class="informative" id="bold-mappings">
<h4><code>bold</code> mappings</h4>
<div data-include="tables/mathvariants-bold.html"></div>
</section>
<section class="informative" id="fraktur-mappings">
<h4><code>fraktur</code> mappings</h4>
<div data-include="tables/mathvariants-fraktur.html"></div>
</section>
<section class="informative" id="script-mappings">
<h4><code>script</code> mappings</h4>
<div data-include="tables/mathvariants-script.html"></div>
</section>
<section class="informative" id="monospace-mappings">
<h4><code>monospace</code> mappings</h4>
<div data-include="tables/mathvariants-monospace.html"></div>
</section>
<section class="informative" id="initial-mappings">
<h4><code>initial</code> mappings</h4>
<div data-include="tables/mathvariants-initial.html"></div>
</section>
<section class="informative" id="sans-serif-mappings">
<h4><code>sans-serif</code> mappings</h4>
<div data-include="tables/mathvariants-sans-serif.html"></div>
</section>
<section class="informative" id="double-struck-mappings">
<h4><code>double-struck</code> mappings</h4>
<div data-include="tables/mathvariants-double-struck.html"></div>
</section>
<section class="informative" id="looped-mappings">
<h4><code>looped</code> mappings</h4>
<div data-include="tables/mathvariants-looped.html"></div>
</section>
<section class="informative" id="stretched-mappings">
<h4><code>stretched</code> mappings</h4>
<div data-include="tables/mathvariants-stretched.html"></div>
</section>
<section class="normative" id="italic-mappings">
are available in Unicode.</p>
<p>These alphanumeric
symbols should be accessed using their Unicode code points.
It is sometimes needed to distinguish between
Chancery and Roundhand style for MATHEMATICAL SCRIPT characters.
These are notably used in LaTeX for the
<code>\mathcal</code> and <code>\mathscr</code> commands.
One way to do that is to rely on
Chapter 23.4 Variation Selectors of
Unicode which describes a way to
specify selection of particular glyph variants [[UNICODE]].
Indeed, the
<code>StandardizedVariants.txt</code> file from the
Unicode Character Database indicates that variant selectors
U+FE00 and U+FE01 can be used on capital script to specify
Chancery and Roundhand respectively.</p>
Alternatively, some
mathematical fonts rely on <code>salt</code> or
<code>ssXY</code> properties from [[OPEN-FONT-FORMAT]]
to provide both styles. Page authors may use the
<a data-xref-type="css-property">font-variant-alternates</a> property with corresponding OpenType font features
to access these glyphs.</p>
<p>In addition, the <code>italic</code> math alphanumeric characters may be accessed as described above using the CSS
<code>text-transform: math-auto</code> transform which is applied by default to single character <code>&lt;mi&gt;</code> elements.
As a convenience the mapping to math italic is shown below.</p>

<section id="italic-mappings">
<h4><code>italic</code> mappings</h4>
<div data-include="tables/mathvariants-italic.html"></div>
</section>
<section class="informative" id="bold-fraktur-mappings">
<h4><code>bold-fraktur</code> mappings</h4>
<div data-include="tables/mathvariants-bold-fraktur.html"></div>
</section>
<section class="informative" id="sans-serif-bold-italic-mappings">
<h4><code>sans-serif-bold-italic</code> mappings</h4>
<div data-include="tables/mathvariants-sans-serif-bold-italic.html"></div>
</section>
<section class="informative" id="sans-serif-italic-mappings">
<h4><code>sans-serif-italic</code> mappings</h4>
<div data-include="tables/mathvariants-sans-serif-italic.html"></div>
</section>
<section class="informative" id="bold-sans-serif-mappings">
<h4><code>bold-sans-serif</code> mappings</h4>
<div data-include="tables/mathvariants-bold-sans-serif.html"></div>
</section>
</section>
<section class="appendix informative">
<h2>Acknowledgments</h2>
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