pub fn tw_previous_node<T: TraversalTree, F: FnMut(usize) -> FilterResult>(
tree: &T,
root: usize,
cur: usize,
what_to_show: u32,
filter: &mut F,
) -> Option<usize>Expand description
TreeWalker: previousNode 走査（W3C DOM Standard §6.2.3 準拠）