When using USS, you can specify values for built-in
VisualElement properties or for custom properties in your UI code.
In addition of reading their values from USS files, built-in property values can be assigned to in C#, using the C# properties of
VisualElement. Values assigned in C# override values from a Unity style sheet (USS).
You can extend USS with the Custom Properties API.
This section lists the supported types.
The following keywords have special meaning:
Limitation: The keywords
unset are imported correctly, but are not supported at runtime.
UIElements does not support units. All property types are assumed to be specified in pixels.
Numeric values are floating points or integer literals. For example:
width:200. Numeric values are stored as floating-point numbers, including integer literals.
Enumerations are only supported for enum-based, built-in properties. Enumerations provide a readable name instead of a number. For example:
UIElements supports the following literal color values and functions:
#FFFF00(rgba one byte per channel),
rgb(255, 255, 0)
rgba(255, 255, 0, 1.0)
hsl(0, 100%, 50%)
You can reference assets with either the
url() functions. For example, specify
background-image: resource("Images/img.png") to specify the
img.png in the
Images directory as the background image. Referenced assets are resolved during import.
resource() function accepts files located under either the
Resources folder or the
Editor Default Resources folder, with the following caveats:
Resourcesfolder, do not include the file extension. For example:
Editor Default Resources, you must include the file extension. For example:
url() function expects the file path to be relative to either the project root or the folder containing the USS file. You must include the file extension. For example:
For textures, if a file has a version with a
@2x suffix, this file is automatically loaded for retina or High DPI screens.
Use quotes to specify a string value. For example: