allowTagExtension method

Allow custom tag extensions with the specified type name and specified attributes.

void allowTagExtension(
String tagName,
String baseName,
{UriPolicy uriPolicy,
Iterable<String> attributes,
Iterable<String> uriAttributes}
)

Allow custom tag extensions with the specified type name and specified attributes.

This will allow tag extensions (such as <div is="x-foo"></div>), but will not allow custom tags. Use allowCustomElement to allow custom tags.