@UCyborg : It's well past midnight here and I had a rough day today (rusty plumbing caused a water leak in one wall of my flat  ), so I'll review the linked documentation tomorrow, when, hopefully, I'll be more lucid  , but, put in layman's terms, who is right and who is wrong here? 
	Is UXP doing the right thing by taking into account "z-index=-2", resulting in the image being hidden, or is Chromium doing the right thing by ignoring "z-index=-2" and, thus, displaying the "story-image"? 
	Thanks in advance  !
 
	From file https://cdn.tunwalai.com/lib/bootstrap5/bootstrap.min.css , L96-L104:
 
    .story-image {
        margin: 0;
        border-radius: 8px;
        display: block;
        height: 292px;
        min-width: 100%;
        width: 292px;
        z-index: -2;
    }