I was unable to type a few minutes ago. Why? How do I fix that without a restart?

The restart did solve it.

What did I accidentally do to cause it?
Update: If I had more information on what caused it, I probably would not need to ask.

I'm guessing I accidentally hit something on my keyboard but I don't know and I cant recall it happening before.

Or it has but only at one website. This was everywhere.

So I had no more information to give.
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