To get the first and last elements with JavaScript querySelector, we use the first-child and last-child selectors.
For instance, we write
const first = div.querySelector("[move_id]:first-child");
const last = div.querySelector("[move_id]:last-child");
to call querySelector with a select with first-child at the end to select the first element with attribyute move_id.
And we call querySelector with a select with last-child at the end to select the first element with attribyute move_id.
