Combining Storyline 1 (or 2) with HTML 5

Lets say i have a course with 30 slides in Storyline. 
Between slide 15 and 16 i wont to add a "slide/ page" created in HTML 5
is that possible and in that case, how do i do it? 

The reason is that i wanna do a special design that aren't possible in Storyline but that i already developed in HTML 5 for another course. 

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