parse method
Implementation
@override
Node parse(BlockParser parser) {
final childLines = parseChildLines(parser);
// Recursively parse the contents of the blockquote.
final children = BlockParser(childLines, parser.document).parseLines(
// The setext heading underline cannot be a lazy continuation line in a
// block quote.
// https://spec.commonmark.org/0.30/#example-93
disabledSetextHeading: _lazyContinuation,
parentSyntax: this,
);
return Element('blockquote', children);
}