struct.
| Auto |
The layout engine will calculate and select a width for the specified element. |
| Center |
In the middle of the parent at the appropriate axis. |
| Contain |
For background images, contain the image within the element bounds. |
| Cover |
For background images, cover the entire element with the image, stretcing and cropping as necessary. |
| Em |
Font size of the current element. |
| End |
End of the parent at the appropriate axis. |
| Expression |
Represents a calc( ... ) expression |
| Percentage |
The length is a percentage (0-100) of the parent's length. (typically) |
| Pixels |
The length is in pixels. |
| RootEm |
Font size of the root element. |
| Start |
Start of the parent at the appropriate axis. |
| Undefined |
Similar to CSS 'unset', basically means we don't have a value; should only really be used under certain
circumstances (e.g. to handle background sizing properly). |
| ViewHeight |
The length is a percentage (0-100) of the viewport's height. |
| ViewMax |
The length is a percentage (0-100) of the viewport's largest side/edge. |
| ViewMin |
The length is a percentage (0-100) of the viewport's smallest side/edge. |
| ViewWidth |
The length is a percentage (0-100) of the viewport's width. |