P {font-style: normal;}
EM {font-style: oblique;}
I {font-style: italic;}

If you look closely at Figure 5-26, you'll see there is no apparent difference between the EM and I elements. In practice, not every font is so sophisticated as to have both an italic face and an oblique face, and even fewer web browsers are sophisticated enough to tell the difference when both faces do exist.

Here is my Web Page with a background image!