Some Nuance voices reading out information in Safari character by character

In Safari, using compact Ava, do a search on www.duckduckgo.com. As you move by heading through the results, you'll hear "heading level 3, 2 items, [name of link]" as expected. Immediately following, though, you'll hear "c-h-e-c-k-e-d-c-h-e-c-k-b-o-x," spelled out exactly as written here.