Notice the graphic in the source web page body translation unit. Each image in a web page is represented by a placeholder graphic in the web page body translation unit to indicate its position in the layout of the web page. This graphic placeholder was copied to the same position in the layout of the translated web page body.
If alternative text has been entered for the image, it appears in the source cell (en-US column, I_1_E row) and can be translated. In this example, alternative text was added to the translation even though the source had no alternative text.