Browser wrong javascript float calculation? [duplicate] - javascript

This question already has answers here:
Why does floating-point arithmetic not give exact results when adding decimal fractions?
(31 answers)
Closed 7 years ago.
If you put this in the browser address bar (firefox/IE8):
javascript:alert(40.34+56.87)
Why the result comes as 97.2100000000001
when its supposed to be 97.21

javascript:alert((40.34+56.87).toFixed(2))

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I was breaking my head debugging the rounding in some application and it boiled down to this:
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Omit 'e+' suffix on a number in JavaScript [duplicate]

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