(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
  typeof define === 'function' && define.amd ? define(['exports'], factory) :
  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.FloatingUIUtilsDOM = {}));
})(this, (function (exports) { 'use strict';

  function getNodeName(node) {
    if (isNode(node)) {
      return (node.nodeName || '').toLowerCase();
    }
    // Mocked nodes in testing environments may not be instances of Node. By
    // returning `#document` an infinite loop won't occur.
    // https://github.com/floating-ui/floating-ui/issues/2317
    return '#document';
  }
  function getWindow(node) {
    var _node$ownerDocument;
    return (node == null || (_node$ownerDocument = node.ownerDocument) == null ? void 0 : _node$ownerDocument.defaultView) || window;
  }
  function getDocumentElement(node) {
    var _ref;
    return (_ref = (isNode(node) ? node.ownerDocument : node.document) || window.document) == null ? void 0 : _ref.documentElement;
  }
  function isNode(value) {
    return value instanceof Node || value instanceof getWindow(value).Node;
  }
  function isElement(value) {
    return value instanceof Element || value instanceof getWindow(value).Element;
  }
  function isHTMLElement(value) {
    return value instanceof HTMLElement || value instanceof getWindow(value).HTMLElement;
  }
  function isShadowRoot(value) {
    // Browsers without `ShadowRoot` support.
    if (typeof ShadowRoot === 'undefined') {
      return false;
    }
    return value instanceof ShadowRoot || value instanceof getWindow(value).ShadowRoot;
  }
  function isOverflowElement(element) {
    const {
      overflow,
      overflowX,
      overflowY,
      display
    } = getComputedStyle(element);
    return /auto|scroll|overlay|hidden|clip/.test(overflow + overflowY + overflowX) && !['inline', 'contents'].includes(display);
  }
  function isTableElement(element) {
    return ['table', 'td', 'th'].includes(getNodeName(element));
  }
  function isContainingBlock(element) {
    const webkit = isWebKit();
    const css = getComputedStyle(element);

    // https://developer.mozilla.org/en-US/docs/Web/CSS/Containing_block#identifying_the_containing_block
    return css.transform !== 'none' || css.perspective !== 'none' || (css.containerType ? css.containerType !== 'normal' : false) || !webkit && (css.backdropFilter ? css.backdropFilter !== 'none' : false) || !webkit && (css.filter ? css.filter !== 'none' : false) || ['transform', 'perspective', 'filter'].some(value => (css.willChange || '').includes(value)) || ['paint', 'layout', 'strict', 'content'].some(value => (css.contain || '').includes(value));
  }
  function getContainingBlock(element) {
    let currentNode = getParentNode(element);
    while (isHTMLElement(currentNode) && !isLastTraversableNode(currentNode)) {
      if (isContainingBlock(currentNode)) {
        return currentNode;
      } else {
        currentNode = getParentNode(currentNode);
      }
    }
    return null;
  }
  function isWebKit() {
    if (typeof CSS === 'undefined' || !CSS.supports) return false;
    return CSS.supports('-webkit-backdrop-filter', 'none');
  }
  function isLastTraversableNode(node) {
    return ['html', 'body', '#document'].includes(getNodeName(node));
  }
  function getComputedStyle(element) {
    return getWindow(element).getComputedStyle(element);
  }
  function getNodeScroll(element) {
    if (isElement(element)) {
      return {
        scrollLeft: element.scrollLeft,
        scrollTop: element.scrollTop
      };
    }
    return {
      scrollLeft: element.pageXOffset,
      scrollTop: element.pageYOffset
    };
  }
  function getParentNode(node) {
    if (getNodeName(node) === 'html') {
      return node;
    }
    const result =
    // Step into the shadow DOM of the parent of a slotted node.
    node.assignedSlot ||
    // DOM Element detected.
    node.parentNode ||
    // ShadowRoot detected.
    isShadowRoot(node) && node.host ||
    // Fallback.
    getDocumentElement(node);
    return isShadowRoot(result) ? result.host : result;
  }
  function getNearestOverflowAncestor(node) {
    const parentNode = getParentNode(node);
    if (isLastTraversableNode(parentNode)) {
      return node.ownerDocument ? node.ownerDocument.body : node.body;
    }
    if (isHTMLElement(parentNode) && isOverflowElement(parentNode)) {
      return parentNode;
    }
    return getNearestOverflowAncestor(parentNode);
  }
  function getOverflowAncestors(node, list, traverseIframes) {
    var _node$ownerDocument2;
    if (list === void 0) {
      list = [];
    }
    if (traverseIframes === void 0) {
      traverseIframes = true;
    }
    const scrollableAncestor = getNearestOverflowAncestor(node);
    const isBody = scrollableAncestor === ((_node$ownerDocument2 = node.ownerDocument) == null ? void 0 : _node$ownerDocument2.body);
    const win = getWindow(scrollableAncestor);
    if (isBody) {
      return list.concat(win, win.visualViewport || [], isOverflowElement(scrollableAncestor) ? scrollableAncestor : [], win.frameElement && traverseIframes ? getOverflowAncestors(win.frameElement) : []);
    }
    return list.concat(scrollableAncestor, getOverflowAncestors(scrollableAncestor, [], traverseIframes));
  }

  exports.getComputedStyle = getComputedStyle;
  exports.getContainingBlock = getContainingBlock;
  exports.getDocumentElement = getDocumentElement;
  exports.getNearestOverflowAncestor = getNearestOverflowAncestor;
  exports.getNodeName = getNodeName;
  exports.getNodeScroll = getNodeScroll;
  exports.getOverflowAncestors = getOverflowAncestors;
  exports.getParentNode = getParentNode;
  exports.getWindow = getWindow;
  exports.isContainingBlock = isContainingBlock;
  exports.isElement = isElement;
  exports.isHTMLElement = isHTMLElement;
  exports.isLastTraversableNode = isLastTraversableNode;
  exports.isNode = isNode;
  exports.isOverflowElement = isOverflowElement;
  exports.isShadowRoot = isShadowRoot;
  exports.isTableElement = isTableElement;
  exports.isWebKit = isWebKit;

}));
