The link points to a wikipedia reference. If the text in that page is magnified using ctrl-+, the last couple links in the list are moved to the grey area to the right, at least in recent Webkit builds. For the last month of Webkit trunk on Win7, the links also become unclickable. Slim grey artifacts show up where the mouse was clicked instead. Works fine in Safari 5.0.3 and Chromium 8.0.552.224 stable, but broken in the last WebKit nightly 74232 for Windows, which is almost a month old, and Chromium 10.0.628.0 dev, all tested on 32-bit Windows. Looks like a regression in trunk Webkit.
Created attachment 79299 [details] artifacts in chrome 10
Created attachment 79300 [details] same artifacts in webkit nightly 73888
smfr on #webkit asked for some screenshots and to try regressing with the nightlies. The grey artifacts covering links 42 and 43 in the middle of the screenshots are the result of trying repeatedly to click on the links. The problem must have been introduced between webkit 73490 and 73888, as I could reproduce the bug with the latter nightly on win7 but not with the former. In the 73490 nightly, zooming the page does not move the last links to a new column on the right, so the bug never crops up.
Confirmed that this bug is still around in the latest WebKit nightly 77737, tested on Windows 7 x86.
It looks like this bug was finally fixed somewhere between Chromium 12.0.703 and 12.0.709.