Only elements that expose a style property can be styled programmatically.

The following elements expose the style property:

About Mixins

Mixins provide functionality that other elements can inherit and use.

Mixins are not elements. You cannot add mixins to a page in the Editor like other $w elements, and mixins are not meant to be used directly in your code.

For example, you would not write code like this, because it is out of context:

let bgColor = $w("#StyleMixin").style.backgroundColor;
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Instead, you can code the following if myElement is an element that "mixes in" StyleMixin.

let bgColor = $w("#myElement").style.backgroundColor;
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