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insert_before

blitz_dom_api::node

Function insert_before 

Source 
pub fn insert_before(
    doc: &mut BaseDocument,
    parent: NodeId,
    new_node: NodeId,
    reference: Option<NodeId>,
) -> Result<NodeId>
Expand description

parent.insertBefore(new_node, reference), returning the inserted node.

reference of None is the DOM’s null reference node and means append. Inserting a node before itself is a no-op.