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app/src/vendor/muuri-src/utils/getContainingBlock.js

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+/**
+ * Copyright (c) 2015-present, Haltu Oy
+ * Released under the MIT license
+ * https://github.com/haltu/muuri/blob/master/LICENSE.md
+ */
+
+import getStyle from './getStyle';
+import isTransformed from './isTransformed';
+
+/**
+ * Returns an absolute positioned element's containing block, which is
+ * considered to be the closest ancestor element that the target element's
+ * positioning is relative to. Disclaimer: this only works as intended for
+ * absolute positioned elements.
+ *
+ * @param {HTMLElement} element
+ * @returns {(Document|Element)}
+ */
+export default function getContainingBlock(element) {
+  // As long as the containing block is an element, static and not
+  // transformed, try to get the element's parent element and fallback to
+  // document. https://github.com/niklasramo/mezr/blob/0.6.1/mezr.js#L339
+  var doc = document;
+  var res = element || doc;
+  while (res && res !== doc && getStyle(res, 'position') === 'static' && !isTransformed(res)) {
+    res = res.parentElement || doc;
+  }
+  return res;
+}