To learn about the behavior of a collapsed element,
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:
Instead, you can code the following if
myElement is an element that can be collapsed and
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