An ad blocked itself from loading, wow lol.
Context
X-Frame-Options allows a website (such as the one loaded an ad box to display an ad) to tell your browser whether it can be embedded in another website
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The ad might be produced by one company, served by a second company through deals made by a third company to a website owned by a fourth company. And the fourth company is trying to do something the second company doesn’t want.
Or it’s a Google ad on youtube.com and they ducked up, who the duck knows.
Ducking autocorrect.
sif not use an ad blocker.