overflow:hidden not working with translation in positive direction

So I've been working with something similar all day and realized that while I had

html, body {overflow:hidden; }

...if I add position:absolute, position:relative or position:fixed to the html and body, it fixes the issue.

I wrap everything in a container div with the following code. Explicitly set overflow appropriately in both directions. This keeps the X-axis from scrolling in iOS Safari, even if there are elements translated to the right of the main content area.

But scrolling performance is significantly degraded unless you add -webkit-overflow-scrolling: touch;. It took me a long time to find this! Hopefully it helps someone else.

.scrollContainer {
  position: absolute;
  width: 100%;
  height: 100%;
  overflow-y: scroll;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
}