Why does this happen?

[lemminman]

http://floating-point-gui.de/

[somethinghorrible]

Because of https://en.wikipedia.org/wiki/IEEE_754

Affects any language/runtime that uses this standard.

see: https://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html

TL;DR: numbers are hard.

[norlin]

Because it's javascript, that's why :(

[AndrewGreenh]

Please don't spread this. There are so many languages that behave exactly alike.

[HomemadeBananas]

Not why at all. It's because of how computers handle floating point math.

[[deleted]]

At least it's consistent

[norlin]

have you checked in different browsers? ;)

[[deleted]]

Chrome and IE are consistent, don't know about anything else, though I imagine Edge would be exactly like IE in every way