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copy.js

// if code snippet is inside input or textarea tags
function copy() {
  var codeSnippet = document.querySelector("#code-snippet");
  codeSnippet.select();
  document.execCommand("copy");
}
document.querySelector("#copy").addEventListener("click", copy);

// if code snippet is inside pre or code tags
function copy() {
  var codeSnippet = document.querySelector("#code-snippet");
  var textarea = document.createElement('textarea');
  textarea.value = codeSnippet.innerText || codeSnippet.textContent;
  document.body.appendChild(textarea);
  textarea.select();
  document.execCommand("copy");
  document.body.removeChild(textarea);
}
document.querySelector("#copy").addEventListener("click", copy);