html5 - Input type="number" with not mandatory step attribute -

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i have input in form step defined 3:

<form>     <input name="surface" id="surface" type="number" step="3" /> </form>

i able enter number not multiple of step, it's refused @ validation browser.

in example, if insert "2.5" in input, message error i've got is:

please select valid value. 2 closest values 0 , 3.

is possible make step not mandatory?
i've tried add novalidate="novalidate" attribute doesn't work.

after more research, appears it's not possible make step non mandatory on html5 input.

i'll have implement custom number input (in jquery or else) achieve this.


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