src/spin.js
function ins(parent /* child1, child2, ... */) {
for (let i = 1, n = arguments.length; i < n; i++) {
    parent.appendChild(arguments[i]);
}

return parent;
}
function ins(parent /* child1, child2, ... */) {
for (let i = 1, n = arguments.length; i < n; i++) {
    parent.appendChild(arguments[i]);
}

return parent;
}
function ins ( parent /* child1, child2, ... */ ) { for ( let i = 1 , n = arguments . length ; i < n ; i ++ ) { parent . appendChild ( arguments [ i ] ) ; } return parent ; }
Appends children and returns the parent.
Appends children and returns the parent .