Normal, width or height defined in CSS as "px", "cm". It can be converted to int using JavaScript function parseInt(string, radix).
The parseInt function produces an integer value dictated by interpretation of the contents of the string argument according to the specified radix. Leading white space in string is ignored. If radix is undefined or 0, it is assumed to be 10 except when the number begins with the character pairs 0x or 0X, in which case a radix of 16 is assumed. If radix is 16, the number may also optionally begin with the character pairs 0x or 0X.
Example: jQuery exercise: get key input, to change CSS layout.
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