Visual Review: Images are missing, the first Image is not shown in one Iframe

FIX: A downloaded Website for the Visual Review may not show responsive images when they had a source set defined FIX: Elements with a background-image set by inline style in a downloaded website for the Visual Review may not show the background image FIX: Some images were not shown either in the original iframe or the WYSIWIG iframe in a Visual Review ENHANCEMENT: Focus-styles made the current page hard to see in the Visual Review pager