Is there a simple way to color the notes in certain measures (e.g. even measures are black vs. odd measures are red)?

[paulrosen]

Yes. call something like abcjs.renderAbc(el, str, { add_classes: true }). All the elements can be targeted with CSS. For instance:

.abcjs-mm0,.abcjs-mm2, abcjs-mm4 {
  fill: red;
}