Diagnostic Stylesheet: identify script[async][defer]

gistfile1.txt

/* @see https://twitter.com/csswizardry/status/1616451810004242432 */

head,
script[async][defer],
script[async][defer]::before {
  display: block !important;
}

script[async][defer]::before {
  background-color: white !important;
  border: 10px solid !important;
  color: red !important;
  content: attr(src) !important;
  padding: 10px !important;
}