The Tor Browser / file revision

 body { margin: 10px; }

 @font-face {

   font-family: gsub-test;

   src: url(../fonts/gsubtest/gsubtest-lookup3.otf);

 }

 td.prop {

   font-family: Menlo, monospace;

   font-weight: normal;

   text-align: left;

   font-size: 80%;

 }

 td.features {

   font-family: gsub-test;

 }

 .invalid {

   color: red;

 }

 @font-feature-values gsub-test {

   @styleset { ok-alt-a: 1 3 5; ok-alt-b: 19; }

   @character-variant { ok-1: 78 2; }

   @character-variant { ok-3: 23; }

   @character-variant { not-good: 0 2; }

   @annotation { ok-4: 1; }

   @annotation { bogus-font-doesnt-support: 23; }

   @annotation { circled: 1; }

   @character-variant { multi-def: 4; }

   @annotation { multi-def: 3; }

   @styleset { multi-def2: 3 4 5; }

   @styleset { MULTI-def2: 2 6; }

   @styleset { out-of-bounds1: 0; out-of-bounds2: 100; }

 }

 @font-feature-values bogus-family {

   @styleset { bogus: 3 4 7; }

 }

 @font-feature-values GSUB-tEsT {

   @styleset { mixed-case: 3 4 7; }

 }

 @font-feature-values gSuB-tEsT {

   @styleset { 3blah: 1 3; }

 }

 @font-feature-values gSuB-tEsT {

   @styleset { moxie: 14; }

   @styleset { 3blah: 1; }

 }

 @font-feature-values gSUB-TeST {

   @styleset { moxie2: 14; }

   @bongo { blah: 1; }

 }

 @font-feature-values gSUB-TEst {

   @bongo { blah2: 1; }

   @styleset { moxie3: 14; }

 }