Vanilla javascript version of jquery siblings with selector (plus callback)

siblings.js

/*
    Browser Compatibility:
    IE: 9, Safari: 3.1, Chrome: 1, Edge: 12, Firefox: 3.5
*/
function getSiblings(el, sel) {
    var matches = [];
    var targets = sel ? el.parentNode.querySelectorAll(sel) : el.parentNode.children;
    for (var target of targets) {
        if (target !== el && target.parentNode === el.parentNode) {
            matches.push(target);
        }
    }
    return matches;
}

/*
    Browser Compatibility:
    IE: -, Safari: 7, Chrome: 27, Edge: 79, Firefox: 32
*/
function getSiblings(el, sel) {
    var matches = [];
    var targets = sel ? el.parentNode.querySelectorAll(":scope > " + sel) : el.parentNode.children;
    for (var target of targets) {
        if (target !== el) {
            matches.push(target);
        }
    }
    return matches;
}

/*
    Browser Compatibility:
    IE: 9, Safari: 3.1, Chrome: 1, Edge: 12, Firefox: 3.5
*/
function siblings(el, sel, cb) {
    var matches = [];
    var targets = sel ? el.parentNode.querySelectorAll(sel) : el.parentNode.children;
    for (var target of targets) {
        if (target !== el && target.parentNode === el.parentNode) {
            matches.push(target);
        }
    }
    if (cb) {
        matches.forEach(cb);
    }
    return matches;
}

/*
    Browser Compatibility:
    IE: -, Safari: 7, Chrome: 27, Edge: 79, Firefox: 32
*/
function siblings(el, sel, cb) {
    var matches = [];
    var targets = sel ? el.parentNode.querySelectorAll(":scope > " + sel) : el.parentNode.children;
    for (var target of targets) {
        if (target !== el) {
            matches.push(target);
        }
    }
    if (cb) {
        matches.forEach(cb);
    }
    return matches;
}