<ons-splitter-side>element is used as a child element of
<ons-splitter>. It will be displayed on either the left or right side of the
<ons-splitter-content>element. It supports two modes: collapsed and split. When it’s in collapsed mode it will be hidden from view and can be displayed when the user swipes the screen or taps a button. In split mode the element is always shown. It can be configured to automatically switch between the two modes depending on the screen size.
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