allowsAttribute method

bool allowsAttribute (Element element, String attributeName, String value)

Returns true if the attribute is allowed.

The attributeName parameter will always be in lowercase.

See allowsElement for format of tagName.

Implementation 

bool allowsAttribute(Element element, String attributeName, String value) {
  return _validators
      .any((v) => v.allowsAttribute(element, attributeName, value));
}