[jjalocha]

Hello DNSB and JSWolf,
Thanks for chiming in about the small caps issue!
Sadly, the extra instructions (on top of font-variant:small-caps;) don’t work for me, it still renders fake small caps, not the true glyphs provided by the font. (Also, still no old style figures.)
Here’s the relevant CSS:

@font-face {
    font-family: "Source Serif 4";
    src: url("../fonts/SourceSerif4-Regular.ttf") format("truetype");
    font-weight: 400;
    font-style: normal;
}
@font-face {
    font-family: "Source Serif 4";
    src: url("../fonts/SourceSerif4-Italic.ttf") format("truetype");
    font-weight: 400;
    font-style: italic;
}
@font-face {
    font-family: "Source Serif 4";
    src: url("../fonts/SourceSerif4-Bold.ttf") format("truetype");
    font-weight: 700;
    font-style: normal;
}
@font-face {
    font-family: "Source Serif 4";
    src: url("../fonts/SourceSerif4-BoldItalic.ttf") format("truetype");
    font-weight: 700;
    font-style: italic;
}

body {
    font-family: "Source Serif 4";
    font-weight: 400;
    text-rendering: geometricPrecision;
}

.sc {
    font-variant: small-caps;               /* high-level property          */
    font-variant-caps: small-caps;          /* high-level property          */
    -moz-font-feature-settings: "smcp";     /* low-level (old Firefox)      */
    -webkit-font-feature-settings: "smcp";  /* low-level (old Webkit)       */
    font-feature-settings: "smcp" on;       /* low-level (all new browsers) */
}
.osf { font-variant-numeric: oldstyle-nums; }