Change record status: 
Introduced in branch: 
1.x
Introduced in version: 
1.1.0
Description: 

The custom element for a view has an attribute "display-id". Instead of being set to the display plugin ID, which is the same for multiple instance of the same display plugin, it's now set to configured the ID of the views display.

Before:

custom_elements_page

After:

The ID of the display, as configured in Views. Usually something like:
custom_elements_page_1

Impacts: 
Themers