matchesSelector.js

// Determine if an element matches a selector
export const matches = (el, selector) => {
  if (!isElement(el)) {
    return false
  }

  // https://developer.mozilla.org/en-US/docs/Web/API/Element/matches#Polyfill
  // Prefer native implementations over polyfill function
  const proto = Element.prototype
  const Matches = proto.matches ||
        proto.matchesSelector ||
        proto.mozMatchesSelector ||
        proto.msMatchesSelector ||
        proto.oMatchesSelector ||
        proto.webkitMatchesSelector ||
        function (sel) {
          const element = this
          const m = selectAll(sel, element.document || element.ownerDocument)
          let i = m.length
          // eslint-disable-next-line no-empty
          while (--i >= 0 && m.item(i) !== element) {}
          return i > -1
        }

  return Matches.call(el, selector)
}