code: public static AbstractHtml findOneTagByAttribute(final boolean parallel,
              final String attributeName, final String attributeValue,
              final AbstractHtml... fromTags) throws NullValueException {
  
          if (attributeName == null) {
              throw new NullValueException(
                      "The attributeName should not be null");
          }
          if (attributeValue == null) {
              throw new NullValueException(
                      "The attributeValue should not be null");
          }
  
          if (fromTags == null) {
              throw new NullValueException("The fromTags should not be null");
          }
  
          final Collection<Lock> locks = getReadLocks(fromTags);
          for (final Lock lock : locks) {
              lock.lock();
          }
  
          try {
              final Stream<AbstractHtml> stream = getAllNestedChildrenIncludingParent(
                      parallel, fromTags);
  
              final Optional<AbstractHtml> any = stream.filter(child -> {
  
                  final AbstractAttribute attr = child
                          .getAttributeByName(attributeName);
  
                  return attr != null
                          && attributeValue.equals(attr.getAttributeValue());
  
              }).findAny();
  
              if (any.isPresent()) {
                  return any.get();
              }
              return null;
          } finally {
              for (final Lock lock : locks) {
                  lock.unlock();
              }
          }
      }
docs: Finds and returns the first (including the nested tags) matching with the
  given attribute name and value.
  
  @param attributeName
  the name of the attribute.
  @param attributeValue
  the value of the attribute
  @param fromTags
  from which the findings to be done.
  @return the first matching tag with the given attribute name and value.
  @throws NullValueException
  if the {@code attributeName},
  {@code attributeValue} or {@code fromTags}
  is null
  @since 3.0.0
  @author WFF