Well, this looks like it could come in handy—no more tedious time in Photoshop trying to select turn a person into a separate layer by hand; this does it for you.
Tuesday, December 18th, 2018
Thursday, January 18th, 2018
Here’s a clever idea from Harry if you’re willing to play the long game in tracking down redundant CSS—add a transparent background image to the rule block and then sit back and watch your server logs for any sign of that sleeper agent ever getting activated.
If you do find entries for that particular image, you know that, somehow, the legacy feature is potentially still accessible—the number of entries should give you a clue as to how severe the problem might be.