a0d929ca_WSRP_v2_0_Specification__Statement_text
[#] CS091 [Section] 5.10.2 [Statement text] 
When the window state is wsrp:minimized, the Portlet SHOULD NOT render visible markup, but is free to include non-visible data such as javascript or hidden forms.
WSRP v2.0 Specification
Statement text