AllowInlineCells

is an option for SelectedCells, Cell, and related constructs that specifies whether inline cells are permitted.

Details

AllowInlineCells is used for SelectedCells to determine whether an inline cell may be returned as a CellObject. If the option is False and an inline cell is selected, then SelectedCells will return the top-level cell that contains the selected inline cell.
AllowInlineCells controls whether a Cell or related construct allows the interactive creation of an inline cell. With the default setting AllowInlineCells->True, you can create cells nested within cells. For example, inline cells are useful for displaying typeset expressions or graphics along with text in the same cell.
With the setting AllowInlineCells->False, inline cells cannot be created inside a cell. For example, this is the case for InputForm input cells.

Generate a cell containing an inline cell:

With AllowInlineCellsTrue, this selects the inline cell:

The selection includes only the inline cell:

With AllowInlineCellsFalse, the selection is automatically expanded to the cell that contains the inline cell:

Now the selection is the entire cell containing the inline cell:

This generates an InputForm cell, where AllowInlineCells->False is set by default:

Attempting to insert an inline cell into an InputForm cell is not normally allowed. The expected result is a beep, with no change in the cell:

This generates an InputForm cell with AllowInlineCells->True:

It is now possible to insert an inline cell:

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