Hey there.
I'm no Pro, but here's some basic fodder the input vs button debate.
Based on w3schools, it kinda sounds like
input may be preferred over
button.
Now as for buttons
(whether via <input> or <button>), aren't they and actionable element?
If my presumption is correct, then the buttons are working exactly how they are supposed to. They're doing nothing

What about getting rid of the "=" button, and make each of the operator buttons into submit buttons.
Rowsdower kinda touched on this with:
Quote:
Originally Posted by Rowsdower!
...That comes in handy if you have more than one type of submit button ...
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In essence, you would just change the work flow
from:
1) X value
2) operator
3) Y value
4) "="
to:
1) X value
2) Y value
3) operator
HTH.
~ Mo