closest ExpressionThe closest expression finds the nearest ancestor element matching a CSS selector. By default it starts from the current element, but you can specify a different starting point with the to clause.
<div _="on click add .clicked to the closest <section/>">...</div>
<div _="on click add .clicked to the closest <div/> to the parentElement of me">
...
</div>
closest <css-selector> [to <expression>]