pub trait TreeWalkerMethods<D>{
// Required methods
fn Root(&self) -> Root<Dom<<D as DomTypes>::Node>>;
fn WhatToShow(&self) -> u32;
fn GetFilter(&self) -> Option<Rc<NodeFilter<D>>>;
fn CurrentNode(&self) -> Root<Dom<<D as DomTypes>::Node>>;
fn SetCurrentNode(&self, value: &<D as DomTypes>::Node);
fn ParentNode(
&self,
_can_gc: CanGc,
) -> Result<Option<Root<Dom<<D as DomTypes>::Node>>>, Error>;
fn FirstChild(
&self,
_can_gc: CanGc,
) -> Result<Option<Root<Dom<<D as DomTypes>::Node>>>, Error>;
fn LastChild(
&self,
_can_gc: CanGc,
) -> Result<Option<Root<Dom<<D as DomTypes>::Node>>>, Error>;
fn PreviousSibling(
&self,
_can_gc: CanGc,
) -> Result<Option<Root<Dom<<D as DomTypes>::Node>>>, Error>;
fn NextSibling(
&self,
_can_gc: CanGc,
) -> Result<Option<Root<Dom<<D as DomTypes>::Node>>>, Error>;
fn PreviousNode(
&self,
_can_gc: CanGc,
) -> Result<Option<Root<Dom<<D as DomTypes>::Node>>>, Error>;
fn NextNode(
&self,
_can_gc: CanGc,
) -> Result<Option<Root<Dom<<D as DomTypes>::Node>>>, Error>;
}