Function merge

packages/core/src/sanitization/html_sanitizer.ts:24–32

(...sets: BooleanRecord[])

}

function merge(...sets: BooleanRecord[]): BooleanRecord {
  const res: BooleanRecord = {};
  for (const s of sets) {
    for (const v in s) {
      if (s.hasOwnProperty(v)) res[v] = true;
    }
  }
  return res;
}

// Good source of info about elements and attributes
// https://html.spec.whatwg.org/#semantics