The page does show in Firefox and IE for example, but not in WebKit.
Confirmed with a local debug build of WebKit r24455 with Safari 3.0 (522.12) on Mac OS X 10.4.10 (8R218). This also occurs with Safari 2.0.4 (419.3) with original WebKit on 10.4.10, so this is not a regression. Works as expected in Firefox 2.0.0.4. Oddly, the page won't load at all in Opera 9.21.
Somehow, <div id="Main1_content"> ends up with a height of 0px via the inspector. Running this javascript: URL after the page loads shows some of the content: javascript:document.getElementById("Main1_content").style.height=500
The page uses a buggy stylesheet (http://www.powerbar.nl/310.css). Specifically this rule: .altijdscroll{overflow :auto;scrollbar-base-color:#ffffff;div{width:100%;height:100%}} The W3.org CSS validator flags this line as invalid, div{width:100%;height:100%} generates a parse error. If I remove the invalid property the page works fine in Safari 3.1.
The current page loads in Safari 17.4.1 at: https://www.powerbar.eu/en_INT the wayback machine also loads in Safari 17.4.1 at: https://web.archive.org/web/20070704140715/http://www.powerbar.nl/default.aspx?class=item&item=310
Created attachment 471076 [details] web archive of powerbar.nl in Safari 17.4.1
Created attachment 471077 [details] screenshot of current powerball.eu
There is a big gap, from this node: <div class="cms-image-container is-standard"> <img loading="lazy"> containing this: <img loading="lazy" src="https://www.powerbar.eu/media/33/56/22/1665481669/red_logo_claim_main.gif" class="cms-image"></div>. If deleted in the html of the website, the website works.
Created attachment 471078 [details] screenshot of Powerball.eu, deleted node
The site renders the same everywhere.