Moving background between X or Y slides

[peterpeterparker]

@sansan88 had the idea to be able to defined a moving background between slide X and Y

For example (deck children):

<img slot="background" start="2" end="3"/>
<img slot="background" start="5" end="7"/>

Something like that...

[sansan88]

that would be great.. or just a "Wrapper" Component arround two slides with an image as background.. justthinkingloud