如何在选择文本时阻止浏览器滚动?潜在的浏览器漏洞吗?

I'm experiencing a strange issue with an app I'm working on... Whenever the user highlights text on a div that's been translated down the page a bit, the browser will instantly start scrolling up. It is really hard to describe so I've made an example page that exhibits the issue...I'm experiencing a strange issue with an app I'