`How to get the relative position of the sub item contained in 'activeselection' in fabricjs'?

Question

Fabricjs version: v4.6.0

const selection = new fabric.ActiveSelection(objs, { canvas })
const childs = selection.getObjects()
console.log('first child position:', childs[0].left, childs[1].top) // -120, -243.5

The 'left' or 'top' I get is negative, which seems to be wrong