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<p>Hello—I hope everyone can forgive a slight abuse of this list ...<br>
</p>
<p>The Adobe Type Team has been working to extend the OpenType
Feature File Specification to add direct support for Variable
fonts. We are introducing the specification changes in two stages:<br>
</p>
<ul>
<li> Stage 1 adds support for variable values</li>
<li> Stage 2 will add support for feature variations (such as
swapping one glyph for another based on axis range conditions)</li>
</ul>
<p>The stage 1 changes are now in a public review period that will
end January 15th 2025. The review repository is:<br>
<br>
<a class="moz-txt-link-freetext" href="https://github.com/adobe-type-tools/feature_file_change_review/">https://github.com/adobe-type-tools/feature_file_change_review/</a></p>
<p>Any further discussion of this topic should of course happen in
that repository, as the Feature File Specification and the Open
Font Format specification are only loosely related.<br>
</p>
<p>Feature files are used in the development of many fonts,
sometimes directly and sometimes "under the hood". We expect these
changes will be of most interest to tool developers and designers
of fonts with extensive or unusual GSUB or GPOS features. The
top-level README of the review repository has more information on
the review process and guidance on whether and how you may want to
participate.</p>
<p>I will be rolling out the announcement of this review across
other channels over the next few days.</p>
<p>Thanks,<br>
</p>
<p>Skef Iterum<br>
Adobe Inc.<br>
</p>
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