this is just how touch works, if you do long touch or just a really light touch it might not be a normal 'tap' afaik

Any time I tapped/clicked the button, the sidenav opened. However, I found that if I clicked in the regions above/below the hamburger button it would highlight the button without triggering the sidenav.

See https://screenshot.googleplex.com/xPa5KK5BCQ0

@dschuyler is this something you can look into or pass to someone who can?

Sorry, to clarify my last comment I could only repro this with touch/stylus, not mouse.

I'm marking this Available so that someone with a touch screen or stylus can look into it (see #4).

It seems like (don't know for sure) the touch/stylus is triggering on a margin click (rather than just content+padding). 

The margins occupy the areas that tbuckley@ marks in #3. This may be fixable by simply removing the margin on the paper-icon-button. I can set "margin: 0;" on it and that doesn't seem to affect the page layout. I'm tempted to patch that in just to see if it fixes it, but it would be better if someone could fix and try it.

@stevenjb would you be able to check this on a touchscreen device?

I can get this to happen. I can also get it to happen less frequently with other events. I can not reliably reproduce it though and can not tell what the pattern is.

It definitely seems to be a lower level issue with how touch events are determined.

Steven, this is a low priority bug. I can repro reliably. I know you looked t it before, but can you help triage this?

I can investigate. I suspect this is not specific to settings but that the event is not always correctly being sent, but I will confirm that.