I don't think it matters which side. What matters more is that everyone does it the same. Most times, I see it on the right.

You're never going to get app developers to independently agree on one consistent way to do anything. In fact, many of them will deliberately do the opposite of what everyone else does, for nebulous "brand differentiation" reasons.

I think of its default as "top left". But "top right" is frequent.

"Not quite top, mostly right" is where IBM puts their SECOND hamburger icon on DNG software. May they rot in eternity...

Most of us Westerners read left-to-right, while being right-handed.

Thus:

"Where should I go?" is answered quickly in the top-left.

Whilst experts repeatedly accessing on Mobile requires top-right.

Just depends on your priorities.

> Whilst experts repeatedly accessing on Mobile requires top-right.

Surely bottom-right?

Putting anything but your page content for me to drag to scroll in the bottom half, right third of a mobile site is a capital offense, IMO.