This handy screenshot is courtesy @MusikAnimal, who clicked on the Edit button for the gallery in https://meta.wikimedia.org/w/index.php?oldid=16093552 and discovered that everything had crashed.
The relevant bit of wikitext said:
<gallery widths="35"> Edit icon.svg|Normal edit RevertPencil icon.svg|For reverting an edit AddImage icon.svg|Icon for creating a file TemplateAdd.svg|Icon for creating a template Trash icon.svg|For deleting a page Untrash icon.svg|For restoring a page RibbonPrize.svg|Icon for marking an article or image as "Featured" Locked icon.svg|For protecting/locking a page Unlock icon.svg|For unprotecting/unlocking a page AddSpeechbubble icon.svg|For starting a discussion Speechbubbles icon.svg|For replying to a comment Translation icon.svg|For translating an article </gallery>
Reported in Chrome 54.0.2840.71 on Mac OS X 10.11.6 and reproduced in Chrome 57.0.2926.0 canary