Here is a way to show URLs after links when printing. This is handy when saving pages as a pdf.
/* Add URL after link when printing */
a:after {
content:"[URL: " attr(href) "] ";
text-decoration: none;
border: none;
}
/* Add image source information after image when printing */
a[href$=jpg],
a[href$=jpeg],
a[href$=jpe],
a[href$=png],
a[href$=gif] {
white-space: pre;
}
a[href$=jpg]:after,
a[href$=jpeg]:after,
a[href$=jpe]:after,
a[href$=png]:after,
a[href$=gif]:after {
content:" \A [Image location: " attr(href) "] ";
text-decoration: none;
}
<p>This is a normal link to <a href="https://pixabay.com/en/boy-dog-ocean-play-childhood-2354068/">a picture on Pixabay</a>.</p>
<p>This is a thumbnail that links to a larger image:</p>
<p><a href="images/boy-2354068_640.jpg"><img src="images/boy-2354068_150.jpg" /></a></p>
You'll need to print preview to see this in action.
This is a normal link to a picture on Pixabay.
This is a thumbnail that links to a larger image: