• Online JavaScript Minifier Tool and Compressor
• JSCompress
• JavaScript Compressor
• JavaScript Minify Tool (Digital Ocean)
• Minify JS / CSS

• If an unexpected element is blocking your screen, you can find the highest z-index value currently in use. Press F12, go to the Console tab, paste this code, and press Enter:

  const highestZ = Math.max(
    ...Array.from(document.querySelectorAll('*'))
      .map(el => parseFloat(window.getComputedStyle(el).zIndex))
      .filter(z => !isNaN(z))
  );
  console.log('Highest z-index on this page:', highestZ);

• To bypass the warning, type allow pasting directly into the Chrome console and press Enter, then paste your code again.

Remember, cross site access to iFrame properties is not possible (security).

<script>
setTimeout(function() {
var iframe = document.getElementById('myframe1');
var innerDoc = (iframe.contentDocument) ? iframe.contentDocument : iframe.contentWindow.document;
var x = innerDoc.getElementsByClassName("place-name");
x[0].innerHTML = "Hello World!";
},5000);
</script>

myvar = document.createElement('input');
myvar.setAttribute('name', 'somename');
myvar.setAttribute('type', 'hidden');
myvar.setAttribute('value', 'somevalue');
form.appendChild(myvar);

• Alternatives to iframe srcdoc
• Why split the <script> tag when writing it with document.write()
• HTML <iframe> Tag
• srcdoc attribute for iframes

• SubtleCrypto.digest()

• google “how to detect in browser whether device has mouse capability”
• Detect It