Eh? 112 works in the whole EU. As your link says. Of course old legacy numbers also work in many countries.

Just like the US, every country in has its own emergency numbers that you should probably know if you're in that country, but for Europe as a whole, 112 is the universal emergency number.

And while 911 might be known to many outside the US, as a number that requires actually navigating the dialing pad, it's not all that great. The UK's 999 or Europe's 112 are far better at being something you can dial while under duress (with 999, as a repeated number, being by far the superior choice here).

I bet little kids would constantly pick up a phone and dial “999999999”.... harder to mistakenly / playfully dial “911”

>Up until 1968, the United States was still using hundreds of seven-digit emergency telephone numbers across the country. In fact, some states, like Nebraska, had more than 180 different ambulance service numbers alone.

>The code 911 was chosen because it best fit the needs of all parties involved,” according to the National Emergency Number Association (NENA). “First, and most important, it met public requirements because it is brief, easily remembered, and can be dialed quickly. Second, because it is a unique number, never having been authorized as an office code, area code or service code, it best met the long range numbering plans and switching configurations of the telephone industry.”