code: function compress2(target, a, b, c) {
                          if (!canCompress(a)) {
                              return;
                          }
                          if (!canCompress(b)) {
                              return;
                          }
                          if (!canCompress(c)) {
                              return;
                          }
                          // Compress
                          styles[target] = styles[a] + ' ' + styles[b] + ' ' + styles[c];
                          delete styles[a];
                          delete styles[b];
                          delete styles[c];
                      }
docs: Compresses multiple styles into one style.