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+# Fonts
+
+Fonts in this directory help testing the `text-spacing-trim` property.
+
+## NotoSansCJKjp-Regular-subset-halt.otf
+
+This font is generated by the following command:
+```
+pyftsubset NotoSansCJKjp-Regular.otf \
+ --unicodes=20-7E,2018-201F,56FD,6C34,3000-301F,30FB,FF01-FF1F,FF5B-FF65 \
+ --layout-features+=halt,fwid,hwid,palt,pwid,vhal,vpal \
+ --output-file=NotoSansCJKjp-Regular-subset-halt.otf
+```
+where `pyftsubset` comes from https://github.com/fonttools/fonttools
+
+## NotoSansCJKjp-Regular-subset-chws.otf
+
+This font has `chws` and `vchw` in addition to the font above.
+
+This font is generated by the following command:
+```
+pyftsubset NotoSansCJKjp-Regular.otf \
+ --unicodes=20-7E,2018-201F,56FD,6C34,3000-301F,30FB,FF01-FF1F,FF5B-FF65 \
+ --layout-features+=halt,fwid,hwid,palt,pwid,vhal,vpal,chws,vchw \
+ --output-file=NotoSansCJKjp-Regular-subset-chws.otf
+```
+Note there are two variants of Noto CJK; one with `chws` and one without.
+The input font for this command must be the one with `chws`, processed by the
+[chws_tool](https://github.com/googlefonts/chws_tool).