more convenient way to mark easy words as 'Never Forget' when starting to study on jpdb. https://jpdb.io/deck?id=3&sort_by=by-frequency-global&show_only=new

jpdb-deck-review.js

const targetNode = document.querySelector("div.vocabulary-list");

const config = { attributes: false, childList: true, subtree: true };

const handleMutations = function (mutationsList) {
  for (const mutation of mutationsList) {
    if (mutation.type === "childList") {
      if (mutation.removedNodes.length > 0) {
        console.log("appending buttons");
        appendButtons();
        removeFurigana();
      }
    }
  }
};

const observer = new MutationObserver(handleMutations);

observer.observe(targetNode, config);

const appendButtons = () =>
  [
    ...document.querySelectorAll('form[action="/deck/never-forget/add"]'),
  ].forEach((elem) =>
      elem?.parentElement?.parentElement?.parentElement?.parentElement?.parentElement?.parentElement?.parentElement?.parentElement?.append(
        elem,
      ),
  );
appendButtons();

const removeFurigana = () =>
  document.querySelectorAll("ruby rt").forEach((elem) => elem.remove());
removeFurigana();