How the engine disables the scroll event on ios?

Hello,

When loading a game (in ios safary browser) it looks like the game has disabled the option to scroll page down or up to prevent showing the address bar. It works on landscape somehow and this is great!

I am trying to figure out where is the implementation inside the game core?
Where I can find the code that handled that?

BTW, it is look like the css is not responsible for that…

I am using cocos creator 2.1.0 (latest release)…