Returns true if the attribute is allowed.
The attributeName parameter will always be in lowercase.
See allowsElement for format of tagName.
bool allowsAttribute(Element element, String attributeName, String value) { return _validators .any((v) => v.allowsAttribute(element, attributeName, value)); }
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https://api.dartlang.org/stable/2.0.0/dart-html/NodeValidatorBuilder/allowsAttribute.html