close method
Attempts to close this tag at the current position.
If a tag cannot be closed at the current position (for example, if a link
reference cannot be found for a link tag's label), then null
is
returned.
If a tag can be closed at the current position, then this method calls
getChildren
, in which parser
parses any nested text into child nodes.
The returned Iterable includes these children nodes.
Implementation
Iterable<Node>? close(
InlineParser parser,
Delimiter opener,
Delimiter closer, {
required String tag,
required List<Node> Function() getChildren,
}) {
return [Element(tag, getChildren())];
}