function isSectionTag( node, name ) {
	if (
		node.type === 'html' &&
		node.value === '<section class="'+name+'">'
	) {
		return 'start';
	}
	if (
		node.type === 'html' &&
		node.value === '<!-- /.'+name+' -->'
	) {
		return 'end';
	}
	return null;
}
Tests whether a node is an opening or closing section tag.

@private
@param {Node} node - node to test
@param {string} name - section name
@returns {(string|null)} returns `start`, `end` or null