misskey/packages/frontend/src/scripts/contains.ts

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/*
* SPDX-FileCopyrightText: syuilo and other misskey contributors
* SPDX-License-Identifier: AGPL-3.0-only
*/
export default (parent, child, checkSame = true) => {
if (checkSame && parent === child) return true;
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let node = child.parentNode;
while (node) {
if (node === parent) return true;
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node = node.parentNode;
}
return false;
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};