What is different between “normal” and “dangerous”

As I read from developer guild in google website http://developer.android.com/guide/topics/manifest/permission-element.html

"normal" The default value. A lower-risk permission that gives requesting applications access to isolated application-level features, with minimal risk to other applications, the system, or the user. The system automatically grants this type of permission to a requesting application at installation, without asking for the user's explicit approval (though the user always has the option to review these permissions before installing).

"dangerous" A higher-risk permission that would give a requesting application access to private user data or control over the device that can negatively impact the user. Because this type of permission introduces potential risk, the system may not automatically grant it to the requesting application. For example, any dangerous permissions requested by an application may be displayed to the user and require confirmation before proceeding, or some other approach may be taken to avoid the user automatically allowing the use of such facilities.

I know what's the meaning for their definition. The difference between them is for "dangerous" level, system may prompt user to approve dangerous permission.

But I want to know, for "dangerous" level, does it really prompt user that any dangerous permissions requested by an application? What I can see is only permission request before installation. Does any example that can prove it?

Thanks

does it really prompt user that any dangerous permissions requested by an application?

In the early days of the Android Market (later renamed the Play Store), if the list of permissions for an app was long, dangerous permissions would be shown "above the fold" — only normal permissions would be hidden in a "See more" fold-out panel.

The current version of the Play Store does not seem to make much visual distinction between normal and dangerous.

Android 6.0+ devices, for apps with targetSdkVersion of 23 or higher, will require the developer to explicitly request dangerous permissions at runtime, and the user will no longer be prompted for normal or dangerous permissions at install time.