Relative image paths even if page is in a folder URL

I'm not sure if this is just me being confused or a Contao issue.

If I look at the site https://contao.org/en/news/contao-4_5_6.html in Safari on a Mac I see books on the right hand side.

The first image has an absolute path of https://contao.org/assets/images/6/x...m9DrWjyaz-.png

I go to Inspect Element the image and the IMG src of the first book is src="assets/images/6/xcontao-academy-174f1dfd.png.pagespeed.ic.m9DrWjyaz-.png". this is a relative path but the current page is in an imitated folder called /en/news/ so I would say the image path should either be relative "../../assets/images[...]" or from the top of the domain with a leading slash "/assets/images[...]".

If I from Safari's inspector right-clicks the image link and say "Open in a new tab" it opens this image - that does not exist:
https://contao.org/en/news/assets/im...m9DrWjyaz-.png

Am I seeing ghosts or is Contao not handling paths OK? It works in all the browsers I've seen but I had a broken link checker choke on this and see it in Safari's and Firefox's source inspector (not Chrome).

Attachment 241

I can not do a test on mac, but folder handling is ok. The browser builds the path form the base tag and the img src.

HTML Code:

---

<base href="https://contao.org/">
...
<img src="assets/images/6/xcontao-academy-174f1dfd.png.pagespeed.ic.m9DrWjyaz-.png" ...

---

Seems that the tool you are usign does not handle it correct. But if this is a Mac Safari bug you should report it on github https://github.com/contao/website/issues