How to access clipboard in javascript code example

Example 1: how to access clipboard via js

navigator.clipboard.readText().then(clipText =>
  document.getElementById("outbox").innerText = clipText);

Example 2: js get copied text

function updateClipboard(newClip) {
  navigator.clipboard.writeText(newClip).then(function() {
    /* clipboard successfully set */
  }, function() {
    /* clipboard write failed */
  });
}