I’m used to change the the value of the Layout number input fields by up and down keys. But at the moment I get autocomplete of my browser and the down and up keys only change the selected suggestions and I’m not able to higher or lower the value. You can prevent this behaviour with <input ... autocomplete="off">
Here I see another issue:
When you use any different unit besides “px” any you delete the value it jumps to “px” even if you insert immediately a new value. Of course it is necessary to go back to default, but it would be nice if it happens only after leaving the form field.
(A similarly behaviour happens when you delete everthing of the label in the Structure Tree. Yes it can’t be empty, but here again, maybe set it to default when you leave it and not when you focus it)