How to make HTML input tag only accept numerical values?

Quick and Easy Code
<input type="text" onkeypress="return (event.charCode !=8 && event.charCode ==0 || (event.charCode >= 48 && event.charCode <= 57))" />
This will permit usage of numbers and backspace only.
If you need decimal part too, use this code fragment
<input type="text" onkeypress="return (event.charCode !=8 && event.charCode ==0 || ( event.charCode == 46 || (event.charCode >= 48 && event.charCode <= 57)))" />

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