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Clone
app-header-layout
to a fix upstream bug PolymerElements/app-layout#486app-header-layout
uses z-index on content which creates a separate stacking content causing dropdown menus to be hidden behind the header.My previous hack applied
transform: translate(0)
on content causing childposition: fixed
elements to behave likeposition: absolute
.However in that case such elements are scrolled together with content. This is OK for dropdown menus, but is bad for FAB.
The solution proposed here: https://stackoverflow.com/a/37682798/4755809 is to have two wrapper divs. The outer one is non-static and is the base for
position: absolute
location, and the inner one is static andoverflow: auto
.