Hamburger update: totes fine
From UXmatters, "Why It’s Totally Okay to Use a Hamburger Icon."
The pendulum swings to a reasonable center. Which, apparently, is the part of a mobile screen where users focus.
UI
Hey screen designers on Macs
You should do this.
Obviously different OSes have different scrollbars, but you'll save yourself a lot of trouble and possibly spot some HTML mistakes before they get bad from just knowing