The JavaScript to do this task is well known. It is simply a case of finding how to deliver it into the web page. Options include

• a view
• a form
• a (Gutenberg) content block

In this first implementation I am using a form.

1. In your view have the tag <table id="tableId">
2. Create a new form
3. Add a hidden field to it (this will not be used)
4. Settings > General >
   1. On Submit > Redirect to URL = ./
   2. Do not store entries
   3. Check Ajax options
5. Settings > Form Actions
   1. Delete all
6. Customise HTML
   1. delete form classes
   2. delete before fields
   3. After fields =

//from https://stackoverflow.com/questions/2044616/select-a-complete-table-with-javascript-to-be-copied-to-clipboard
<script>
function selectElementContents(el) {
  var body = document.body, range, sel;
    if (document.createRange && window.getSelection) {
      range = document.createRange();
      sel = window.getSelection();
      sel.removeAllRanges();
      try {
        range.selectNodeContents(el);
        sel.addRange(range);
      } catch (e) {
        range.selectNode(el);
        sel.addRange(range);
      }

    document.execCommand("copy");
  } else if (body.createTextRange) {
    range = body.createTextRange();
    range.moveToElementText(el);
    range.select();
    range.execCommand("Copy");
}
alert("Table copied to clipboard. You can now paste it into Excel or another application");
}
</script>

4. Submit Button

<div class="frm_submit">
<input type="button" value="Copy table" onclick="selectElementContents( document.getElementById('tableId') );">
</div>