# $Asset A global merge field to use when referencing images and other assets that are part of the Lightning Design System. ## Usage In a Visualforce page that uses ``, `$Asset.SLDS` allows you to use the images, icons, and avatars that are part of the Lightning Design System. Use the `URLFOR()` formula function to reference assets using `$Asset` with dot notation. To use SVG icons, add the required XML namespaces by using `xmlns="http://www.w3.org/2000/svg"` and `xmlns:xlink="http://www.w3.org/1999/xlink"` in the `html` tag. :::note If you’re using the Salesforce sidebar, header, or built-in style sheets, you can’t add attributes to the `html`. VG icons are supported only if `showHeader`, `standardStylesheets`, and `sidebar` are set to `false`. ::: ## Example The following markup references an avatar in the Lightning Design System. ```visualforce ``` The following markup references the Lightning Design System’s SVG account icon. ```visualforce ``` **See Also** - [Using the Lightning Design System](/docs/platform/salesforce-pages-developers-guide/guide/pages-styling-slds.md)