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In CSS 2.1 this was undefined.
CSS 2.1 -- 12.1 The :before and :after pseudo-elements
Note. This specification does not fully define the interaction
of :before and :after with replaced elements (such as IMG in HTML).
This will be defined in more detail in a future specification.
-- https://www.w3.org/TR/CSS21/generate.html#before-after-content
In CSS 3 the :before and :after generated content boxes are not allowed
on replaced elements.
CSS 3 Generated and Replaced Content Module
12. Replaced content
The box model defines different rules for the layout of replaced
elements than normal elements. Replaced elements do not have
'::before' and '::after' pseudo-elements; the 'content' property
in the case of replaced content replaces the entire contents of
the element's box.
-- https://www.w3.org/TR/css3-content/#replacedContent