First, is it possible to create inputs like this with textarea or other element?

And how could generate infinite numbers with jquery? (adding and subtracting)
I hope your help
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This is called a “spinner” control and is not a native HTML object. You need to use JavaScript to make this work.
There are several plug-ins for jQuery that can do this for you.
Basically it’s a textbox with two links beside it. Scripting handles the rest.