Paper-items are simple list elements, ideally used in a paper-listbox or
an element with role="listbox"
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They can be styled using custom properties
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To add a leading element, use a paper-icon-item with a slot="item-icon"
attribute in webcomponents v1. This leading image can be an iron-icon, or any other regular element.
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For two-line items, use a paper-item-body inside a paper-item or paper-icon-item
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Complex layouts are usually a combination of all these elements