Вставьте маркеры и другие символы с Google Диска

const blobToHTML = (blob, target) => {
  const reader = new FileReader();
  reader.onload = (event) => {
    const parser = new DOMParser();
    const doc = parser.parseFromString(event.target.result, 'text/html');
    console.info(doc);
    target.innerHTML = doc.body.innerHTML;
  };
  reader.readAsText(blob);
};

document.querySelector(".btn").addEventListener('click', async() => {
  try {
    const clipboardContents = await navigator.clipboard.read();
    for (const item of clipboardContents) {
      if (item.types.includes("text/html")) {
        const blob = await item.getType("text/html");
        blobToHTML(blob, document.querySelector(".preview"));
      }
    }
  } catch (error) {
    console.error(error.message);
  }
});

<button class = "btn">Click me</button>
<p class = "preview"></p>