Here is an interesting test from Microsoft Bing. The search company is testing placing a newspaper emoji and a magnifying glass emoji as the favicon in the title of the search results pages. It is unusual and I am not sure why Bing is testing it, but they are.
Frank Sandtmann, a German based SEO consultant, sent me a bunch of screenshots of this happening. I was able to replicate this myself with a lot of refreshing and here are my screenshots of these emoji and favicon tests:
Normal Bing favicon:
Magnifying glass emoji:
Newspaper emoji:
Why is Microsoft Bing testing this? I am not sure...
Forum discussion at Twitter.