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Is it possible to have a full page using a masterpage, but a breakpoint on that page that does not?

I'm not 100% sure what you are asking. However, the page and masterpage should have the same breakpoints.

My masterpage has no breakpoints.
My other page uses the masterpage in default mode..
That page has a breakpoint at 400.
What I wonder is if this part of the page, defined by the breakpoint , can get rid of the masterpage usage, although the page is using the masterpage in default mode.

If you add breakpoints to a page then you need to add the same breakpoints to the master page.

The master page is shared between all breakpoints because it is the same page!

OK thx