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Provided the writing does not greatly diminish the ability of the driver to see out of said window, no, it is not illegal. What determines such ability is fairly inconsistent, but if you can't clearly read the license plate of a car behind you, then it's too much.
In the United States, that law is determined by the state the vehicle is registered in. And only enforced by authorities within that state.
What else can I help you with?
Who drives in the cars with dark windows?
Anyone who can afford it. In many states a window that is too dark is illegal.
How do you roll back a digital speedometer in cars?
NOT! It is illegal to tamper with an odometer.
Is it illegal to paint cars?
NO
Are spotlights on cars illegal?
Not in Oregon or Washington, but how you use it can be illegal.
Is it illegal to drive a car without a horn?
In states where cars have to be inspected it is illegal. In the UK it is illegal.
What are cars that are illegal?
liened vehicles
What is EW in cars?
electric windows
Will petrol cars be illegal in the future?
Yes.
How do you reverse my cars mileage?
It is illegal. Don't do it
Is it illegal to clean cars for charity?
Nope.
What cars are illegal to drive in the US?
Buggati
What classic cars have a split rear window?
Split rear windows cars
