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<!DOCTYPE html> <html> <head> <title>Title of the Document</title> </head> <body> <script> function checkedPhoneKey(key) { return(key >= '0' && key <= '9') || key == '+' || key == '(' || key == ')' || key == '-'; } </script> <input onkeydown="return checkedPhoneKey(event.key)" placeholder="Phone number" type="tel"> </body> </html>