Fill a layer with the background color using Ctrl+Backspace (Windows)/Command+Delete (Mac).
Add the Shift key to preserve transparency while filling (only fills the areas containing pixels).
Use Shift+Backspace (Windows)/Shift+Delete (Mac) to open the Edit > Fill dialog.
Use Ctrl+Alt+Backspace (Windows)/Command+Option+Delete (Mac) to fill from the active history state.
Add the Shift key to preserve transparency when filling from history (not applicable to Elements).
Compatibility: Photoshop 5 and higher, Photoshop Elements
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