https://tsukushinbo.jp/assets/js/iframe.js

1var iframe = document.querySelectorAll('.js-variable-frame iframe');
2var node = Array.prototype.slice.call(iframe, 0);
3
4function changeParentHeight(e) {
5  setTimeout(function () {
6    e.style.height = 0;
7    e.style.height = e.contentWindow.document.body.scrollHeight + 'px';
8  }, 100);
9}
10
11Object.defineProperty(window, 'notify', {
12  get: function () {
13    node.forEach(function (elem) {
14      changeParentHeight(elem);
15    });
16  }
17});
18
19node.forEach(function (elem) {
20  elem.addEventListener('load', function () {
21    elem.contentWindow.document.addEventListener('click', parent.notify);
22  })
23});
24
25window.onload = function () {
26  parent.notify;
27}
28
29var timer = 0;
30window.onresize = function () {
31  if (timer > 0) {
32    clearTimeout(timer);
33  }
34  timer = setTimeout(function () {
35    parent.notify;
36  }, 100);
37};