@popperjs/core
Version:
Tooltip and Popover Positioning Engine
23 lines (17 loc) • 665 B
JavaScript
export default function contains(parent, child) {
// $FlowFixMe: hasOwnProperty doesn't seem to work in tests
var isShadow = Boolean(child.getRootNode && child.getRootNode().host); // First, attempt with faster native method
if (parent.contains(child)) {
return true;
} // then fallback to custom implementation with Shadow DOM support
else if (isShadow) {
var next = child;
do {
if (next && parent.isSameNode(next)) {
return true;
} // $FlowFixMe: need a better way to handle this...
next = next.parentNode || next.host;
} while (next);
} // Give up, the result is false
return false;
}