Keyboard focus
Thumbnails can be navigated using a keyboard in certain scenarios, such as layers or layer masks. When a thumbnail is used as pure representation of an item, focus should be set on the component the thumbnail is used within.
Image
Thumbnails feature rounded corners and may include images with transparency. A subtle inset border helps distinguish images that might otherwise blend into the product's theme colors.
Layer
When thumbnails are used in layer management (such as Treeview, Compact or Detail Layers panels), the thumbnail is given a thick gray border.
Selected layer
When a user selects a thumbnail in layer management, such as in Treeview, Compact or Detail Layers panels, it is highlighted with a thick blue border.