[Doitsu]

Originally Posted by roger64

I had been told this property is unsupported by many readers [...]

I haven't really investigated this, but, AFAIK, very few fonts support "real small caps." I.e., if you use small caps it's usually better to embed a font known to support them. BTW, all current Kindle models support font-variant: small-caps; without embedded fonts.

Originally Posted by jackie_w

Too bad it didn't work. Another possibility, in Kobo kepubs this also worked:

-webkit-font-feature-settings: "liga", "dlig";

Unfortunately, that doesn't seem to work with the desktop version of ADE 4.5 either.

Stylesheet:

body {
    text-rendering: optimizeLegibility;
}

/* Common/standard ligatures (liga) */
.liga {
  font-variant-ligatures: common-ligatures;
  -moz-font-feature-settings: "liga", "clig";
  -webkit-font-feature-settings: "liga", "clig";
  font-feature-settings: "liga", "clig";
}

/* Discretionary ligatures (dlig) */
.dlig {
  font-variant-ligatures: discretionary-ligatures;
  -moz-font-feature-settings: "dlig";
  -webkit-font-feature-settings: "dlig";
  font-feature-settings: "dlig";
}

HTML file:

  <h2 id="sigil_toc_id_1">Common/standard ligatures (liga)</h2>

  <p>ff fi fl ffi</p>

  <p class="liga">ff fi fl ffi</p>

  <h2 id="sigil_toc_id_2">Discretionary ligatures (dlig)<br/></h2>

  <p>ct sp st ct Th</p>

  <p class="dlig">ct sp st ct Th</p>

Maybe the version of Minion Pro bundled with ADE 4.5 simply doesn't support these features. Most likely the Kobo developers bundled the RMSDK based Kobo ADE app with better fonts.