How do you align left / right a div without using float?

Question

When doing something like this:

Left Div
Right Div

Answer 1

you could use things like display: inline-block but I think you would need to set up another div to move it over, if there is nothing going to the left of the button you could use margins to move it into place.

Alternatively but not a good solution, you could position tags; put the encompassing div as position: relative and then the div of the button as position: absolute; right: 0, but like I said this is probably not the best solution

HTML

  
Left Div
  
Right Div

CSS

.parent {
  position: relative;
}
.right {
    position: absolute;
    right: 0;
}