Function getTopOffset

src/components/fx/hover.js:2547–2547

(gd)

// a sibling of the graph div, it will be positioned correctly relative to
// the offset parent, whatever that may be.
const getTopOffset = (gd) => gd.offsetTop + gd.clientTop;
const getLeftOffset = (gd) => gd.offsetLeft + gd.clientLeft;

function getBoundingClientRect(gd, node) {