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iframe-replace.js

function iFrameFix(aId, divId) {
  const $a = document.getElementById(aId);
  const $div = document.getElementById(divId);
  const renderIframe = (img = {}) => {
    const w = img.naturalWidth || 100;
    const h = img.naturalHeight || 100;
    $div.innerHTML = `<iframe src="${a.href}" frameborder=0 width="${w}" height="${h}"></iframe>`;
  };
  if ($a !== null && $div !== null) {
    let img = div.querySelector("img");
    if (img) {
      if (img.complete) {
        renderIframe(img);
      } else {
        img.addEventListener("load", () => renderIframe(img));
      }
    } else {
      renderIframe();
    }
  }
}

iframeFix("iframe_A", "iframe_DIV");
iframeFix("iframeLink", "iframeDiv");