Please see jsbin: http://jsbin.com/zeyoh/1

I merely copied the core-header-panel demo, but changed the content height 
from 2000px to 300px. As you can see, the bottom part of the content 
portion can't be accessed because the header automatically tries to expand 
itself, hence pushing part of the content down, even if supposedly there 
isn't enough space to expand yet.

I'm not sure, but I think this can be fixed I guess by adding a check in 
this line 
<https://github.com/Polymer/core-header-panel/blob/master/core-header-panel.html#L206>
 to compute 
the content & viewport heights to see if it's the correct time to expand 
the header already. Though this is quite a dirty fix, let's discuss this 
first and see if someone else might have a more elegant solution. If not, 
then I'll go ahead and take a jab at it by submitting a PR to the 
core-header-panel repo.

So, any better ideas how to work around this?

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