2.1.47 [W3C-HTML51] Section 4.10.5.1.12 Number state (type=number)
V0156: White space in floating-point number values is treated as invalid
The specification states:
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... Number state (type=number) ... If the element is mutable, the user agent should allow the user to change the number represented by its value, as obtained from applying the rules for parsing floating-point number values to it. ...
EdgeHTML Mode
White space in floating-point number values is treated as invalid; it should be ignored.