src / common.js

Copyright (c) 2018 Florian Klampfer

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see

export const matches =
  Element.prototype.matches ||
  Element.prototype.matchesSelector ||
  Element.prototype.msMatchesSelector ||
  Element.prototype.mozMatchesSelector ||
  Element.prototype.webkitMatchesSelector ||

Checks if this element or any of its parents matches a given selector.

export function matchesAncestors(selector) {
  let curr = this;
  while (curr !== document && curr !== document.documentElement) {
    if (, selector)) return curr;
    curr = curr.parentNode;
  return null;

Consider a URL external if either the protocol, hostname or port is different.

export function isExternal({ protocol, host }, location = window.location) {
  return protocol !== location.protocol || host !==;

export function isHash({ hash, origin, pathname }, location = window.location) {
  return hash !== "" && origin === location.origin && pathname === location.pathname;

export function getScrollHeight() {
  const h = document.documentElement;
  const b = document.body;
  const sh = "scrollHeight";
  return h[sh] || b[sh];

export function getScrollLeft() {
  return window.pageXOffset || document.body.scrollLeft;

export function getScrollTop() {
  return window.pageYOffset || document.body.scrollTop;

export function fragmentFromString(strHTML) {
  return document.createRange().createContextualFragment(strHTML);

© 2018 Florian Klampfer

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