HighlightRegistry: forEach() メソッド

forEach(callbackFn)
forEach(callbackFn, thisArg)

function logAllHighlights(highlight, name) {
  console.log(`Highlight ${name} exists in the registry`, highlight);
}
const customHighlight1 = new Highlight();
const customHighlight2 = new Highlight();
const customHighlight3 = new Highlight();
CSS.highlights.set("custom-highlight-1", customHighlight1);
CSS.highlights.set("custom-highlight-2", customHighlight2);
CSS.highlights.set("custom-highlight-3", customHighlight3);
CSS.highlights.forEach(logAllHighlights);