browser/static/htmp.js


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const iframe = document.createElement("iframe");
iframe.name = "htmp";
iframe.hidden = true;
iframe.addEventListener("load", function () {
  setTimeout(() => {
    const cd = this.contentDocument;
    const cw = this.contentWindow;
    // If the server responds with an entire HTML document, replace the current document with it.
    // To check whether the response is an entire page we check the presence of this very snippet.
    if (cd.querySelector("iframe[name='htmp']")) {
      document.documentElement.replaceWith(cd.documentElement);
      // If the server responds with a fragment, replace the target element with it.
    } else {
      document
        .querySelector(cw.location.hash || null)
        ?.replaceWith(...cd.body.childNodes);
      const url = new URL(cw.location.href);
      url.searchParams.delete("htmp");
      url.hash = "";
      history.replaceState({}, "", url.toString());
    }
  });
});
document.body.appendChild(iframe);

document.querySelectorAll("form[htmp]").forEach(function (el) {
  const r = el.attributes.replace.value;
  const input = document.createElement("input");
  input.type = "hidden";
  input.name = "htmp";
  input.value = r;
  el.appendChild(input);

  const action = new URL(el.action);
  action.hash = r;
  el.action = action.toString();
  el.target = "htmp";
});