Can Users Select and Copy IDs Created by Generated Content in CSS?

Making Generated Content Selectable

One way to display hidden element identifiers is by using generated content within CSS. For instance:

h2:hover:after {
  color: grey;
  content: "#" attr(id);
  float: right;
  font-size: smaller;
  font-weight: normal;
}

However, there's a limit to this approach.

Question: Is there a way to enable users to select and copy the ID ("#my-id") created by generated content?

Answer: Unfortunately, no.

This is because pseudo-elements are not part of the DOM (Document Object Model). As per section 5.10 of CSS2.1, neither pseudo-elements nor pseudo-classes are found in the document source or document tree. Therefore, making generated content selectable is not possible.

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