code: protected boolean removeFromAttributeValueMap(final String key,
              final String value) {
  
          final Collection<AbstractHtml5SharedObject> sharedObjects = getSharedObjects();
  
          final Collection<WriteLock> writeLocks = lockAndGetWriteLocks();
          boolean listenerInvoked = false;
          try {
  
              final boolean removed = getAttributeValueMap().remove(key, value);
  
              if (removed) {
                  setModified(true);
                  invokeValueChangeListeners(sharedObjects);
                  listenerInvoked = true;
              }
  
          } finally {
              for (final Lock lock : writeLocks) {
                  lock.unlock();
              }
          }
          pushQueues(sharedObjects, listenerInvoked);
          return listenerInvoked;
      }
docs: removes only if the key and value matches in the map for any particular
  entry.
  
  @param key
  @param value
  @since 1.0.0
  @author WFF
  @return true if it is modified