Attributes for slides and background images
It would very good for SEO and CSS purposes if we could add attributes in slide images and background images; "alt=", "class=", "id=".
This could make their CSS styling much easier and they could contribute to the SEO of the page.
The only thing that can be done right now is to use the class of the background image, which is automatically created from its text position (see screenshot); for this example the class is "tile-block-img t-l" (t-l=top left). Although this is a good trick for anyone who knows, it is not the proper way for many reasons.