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function () {} : Element.prototype.matches || Element.prototype.msMatchesSelector || Element.prototype.webkitMatchesSelector;\nvar getRootNode = !NoElement && Element.prototype.getRootNode ? function (element) {\n return element.getRootNode();\n} : function (element) {\n return element.ownerDocument;\n};\n/**\n * @param {Element} el container to check in\n * @param {boolean} includeContainer add container to check\n * @param {(node: Element) => boolean} filter filter candidates\n * @returns {Element[]}\n */\n\nvar getCandidates = function getCandidates(el, includeContainer, filter) {\n var candidates = Array.prototype.slice.apply(el.querySelectorAll(candidateSelector));\n\n if (includeContainer && matches.call(el, candidateSelector)) {\n candidates.unshift(el);\n }\n\n candidates = candidates.filter(filter);\n return candidates;\n};\n/**\n * @callback GetShadowRoot\n * @param {Element} element to check for shadow root\n * @returns {ShadowRoot|boolean} ShadowRoot if available or boolean indicating if a shadowRoot is attached but not available.\n */\n\n/**\n * @callback ShadowRootFilter\n * @param {Element} shadowHostNode the element which contains shadow content\n * @returns {boolean} true if a shadow root could potentially contain valid candidates.\n */\n\n/**\n * @typedef {Object} CandidatesScope\n * @property {Element} scope contains inner candidates\n * @property {Element[]} candidates\n */\n\n/**\n * @typedef {Object} IterativeOptions\n * @property {GetShadowRoot|boolean} getShadowRoot true if shadow support is enabled; falsy if not;\n * if a function, implies shadow support is enabled and either returns the shadow root of an element\n * or a boolean stating if it has an undisclosed shadow root\n * @property {(node: Element) => boolean} filter filter candidates\n * @property {boolean} flatten if true then result will flatten any CandidatesScope into the returned list\n * @property {ShadowRootFilter} shadowRootFilter filter shadow roots;\n */\n\n/**\n * @param {Element[]} elements list of element containers to match candidates from\n * @param {boolean} includeContainer add container list to check\n * @param {IterativeOptions} options\n * @returns {Array.<Element|CandidatesScope>}\n */\n\n\nvar getCandidatesIteratively = function getCandidatesIteratively(elements, includeContainer, options) {\n var candidates = [];\n var elementsToCheck = Array.from(elements);\n\n while (elementsToCheck.length) {\n var element = elementsToCheck.shift();\n\n if (element.tagName === 'SLOT') {\n // add shadow dom slot scope (slot itself cannot be focusable)\n var assigned = element.assignedElements();\n var content = assigned.length ? assigned : element.children;\n var nestedCandidates = getCandidatesIteratively(content, true, options);\n\n if (options.flatten) {\n candidates.push.apply(candidates, nestedCandidates);\n } else {\n candidates.push({\n scope: element,\n candidates: nestedCandidates\n });\n }\n } else {\n // check candidate element\n var validCandidate = matches.call(element, candidateSelector);\n\n if (validCandidate && options.filter(element) && (includeContainer || !elements.includes(element))) {\n candidates.push(element);\n } // iterate over shadow content if possible\n\n\n var shadowRoot = element.shadowRoot || // check for an undisclosed shadow\n typeof options.getShadowRoot === 'function' && options.getShadowRoot(element);\n var validShadowRoot = !options.shadowRootFilter || options.shadowRootFilter(element);\n\n if (shadowRoot && validShadowRoot) {\n // add shadow dom scope IIF a shadow root node was given; otherwise, an undisclosed\n // shadow exists, so look at light dom children as fallback BUT create a scope for any\n // child candidates found because they're likely slotted elements (elements that are\n // children of the web component element (which has the shadow), in the light dom, but\n // slotted somewhere _inside_ the undisclosed shadow) -- the scope is created below,\n // _after_ we return from this recursive call\n var _nestedCandidates = getCandidatesIteratively(shadowRoot === true ? element.children : shadowRoot.children, true, options);\n\n if (options.flatten) {\n candidates.push.apply(candidates, _nestedCandidates);\n } else {\n candidates.push({\n scope: element,\n candidates: _nestedCandidates\n });\n }\n } else {\n // there's not shadow so just dig into the element's (light dom) children\n // __without__ giving the element special scope treatment\n elementsToCheck.unshift.apply(elementsToCheck, element.children);\n }\n }\n }\n\n return candidates;\n};\n\nvar getTabindex = function getTabindex(node, isScope) {\n if (node.tabIndex < 0) {\n // in Chrome, <details/>, <audio controls/> and <video controls/> elements get a default\n // `tabIndex` of -1 when the 'tabindex' attribute isn't specified in the DOM,\n // yet they are still part of the regular tab order; in FF, they get a default\n // `tabIndex` of 0; since Chrome still puts those elements in the regular tab\n // order, consider their tab index to be 0.\n // Also browsers do not return `tabIndex` correctly for contentEditable nodes;\n // so if they don't have a tabindex attribute specifically set, assume it's 0.\n //\n // isScope is positive for custom element with shadow root or slot that by default\n // have tabIndex -1, but need to be sorted by document order in order for their\n // content to be inserted in the correct position\n if ((isScope || /^(AUDIO|VIDEO|DETAILS)$/.test(node.tagName) || node.isContentEditable) && isNaN(parseInt(node.getAttribute('tabindex'), 10))) {\n return 0;\n }\n }\n\n return node.tabIndex;\n};\n\nvar sortOrderedTabbables = function sortOrderedTabbables(a, b) {\n return a.tabIndex === b.tabIndex ? a.documentOrder - b.documentOrder : a.tabIndex - b.tabIndex;\n};\n\nvar isInput = function isInput(node) {\n return node.tagName === 'INPUT';\n};\n\nvar isHiddenInput = function isHiddenInput(node) {\n return isInput(node) && node.type === 'hidden';\n};\n\nvar isDetailsWithSummary = function isDetailsWithSummary(node) {\n var r = node.tagName === 'DETAILS' && Array.prototype.slice.apply(node.children).some(function (child) {\n return child.tagName === 'SUMMARY';\n });\n return r;\n};\n\nvar getCheckedRadio = function getCheckedRadio(nodes, form) {\n for (var i = 0; i < nodes.length; i++) {\n if (nodes[i].checked && nodes[i].form === form) {\n return nodes[i];\n }\n }\n};\n\nvar isTabbableRadio = function isTabbableRadio(node) {\n if (!node.name) {\n return true;\n }\n\n var radioScope = node.form || getRootNode(node);\n\n var queryRadios = function queryRadios(name) {\n return radioScope.querySelectorAll('input[type=\"radio\"][name=\"' + name + '\"]');\n };\n\n var radioSet;\n\n if (typeof window !== 'undefined' && typeof window.CSS !== 'undefined' && typeof window.CSS.escape === 'function') {\n radioSet = queryRadios(window.CSS.escape(node.name));\n } else {\n try {\n radioSet = queryRadios(node.name);\n } catch (err) {\n // eslint-disable-next-line no-console\n console.error('Looks like you have a radio button with a name attribute containing invalid CSS selector characters and need the CSS.escape polyfill: %s', err.message);\n return false;\n }\n }\n\n var checked = getCheckedRadio(radioSet, node.form);\n return !checked || checked === node;\n};\n\nvar isRadio = function isRadio(node) {\n return isInput(node) && node.type === 'radio';\n};\n\nvar isNonTabbableRadio = function isNonTabbableRadio(node) {\n return isRadio(node) && !isTabbableRadio(node);\n};\n\nvar isZeroArea = function isZeroArea(node) {\n var _node$getBoundingClie = node.getBoundingClientRect(),\n width = _node$getBoundingClie.width,\n height = _node$getBoundingClie.height;\n\n return width === 0 && height === 0;\n};\n\nvar isHidden = function isHidden(node, _ref) {\n var displayCheck = _ref.displayCheck,\n getShadowRoot = _ref.getShadowRoot;\n\n // NOTE: visibility will be `undefined` if node is detached from the document\n // (see notes about this further down), which means we will consider it visible\n // (this is legacy behavior from a very long way back)\n // NOTE: we check this regardless of `displayCheck=\"none\"` because this is a\n // _visibility_ check, not a _display_ check\n if (getComputedStyle(node).visibility === 'hidden') {\n return true;\n }\n\n var isDirectSummary = matches.call(node, 'details>summary:first-of-type');\n var nodeUnderDetails = isDirectSummary ? node.parentElement : node;\n\n if (matches.call(nodeUnderDetails, 'details:not([open]) *')) {\n return true;\n } // The root node is the shadow root if the node is in a shadow DOM; some document otherwise\n // (but NOT _the_ document; see second 'If' comment below for more).\n // If rootNode is shadow root, it'll have a host, which is the element to which the shadow\n // is attached, and the one we need to check if it's in the document or not (because the\n // shadow, and all nodes it contains, is never considered in the document since shadows\n // behave like self-contained DOMs; but if the shadow's HOST, which is part of the document,\n // is hidden, or is not in the document itself but is detached, it will affect the shadow's\n // visibility, including all the nodes it contains). The host could be any normal node,\n // or a custom element (i.e. web component). Either way, that's the one that is considered\n // part of the document, not the shadow root, nor any of its children (i.e. the node being\n // tested).\n // If rootNode is not a shadow root, it won't have a host, and so rootNode should be the\n // document (per the docs) and while it's a Document-type object, that document does not\n // appear to be the same as the node's `ownerDocument` for some reason, so it's safer\n // to ignore the rootNode at this point, and use `node.ownerDocument`. Otherwise,\n // using `rootNode.contains(node)` will _always_ be true we'll get false-positives when\n // node is actually detached.\n\n\n var nodeRootHost = getRootNode(node).host;\n var nodeIsAttached = (nodeRootHost === null || nodeRootHost === void 0 ? void 0 : nodeRootHost.ownerDocument.contains(nodeRootHost)) || node.ownerDocument.contains(node);\n\n if (!displayCheck || displayCheck === 'full') {\n if (typeof getShadowRoot === 'function') {\n // figure out if we should consider the node to be in an undisclosed shadow and use the\n // 'non-zero-area' fallback\n var originalNode = node;\n\n while (node) {\n var parentElement = node.parentElement;\n var rootNode = getRootNode(node);\n\n if (parentElement && !parentElement.shadowRoot && getShadowRoot(parentElement) === true // check if there's an undisclosed shadow\n ) {\n // node has an undisclosed shadow which means we can only treat it as a black box, so we\n // fall back to a non-zero-area test\n return isZeroArea(node);\n } else if (node.assignedSlot) {\n // iterate up slot\n node = node.assignedSlot;\n } else if (!parentElement && rootNode !== node.ownerDocument) {\n // cross shadow boundary\n node = rootNode.host;\n } else {\n // iterate up normal dom\n node = parentElement;\n }\n }\n\n node = originalNode;\n } // else, `getShadowRoot` might be true, but all that does is enable shadow DOM support\n // (i.e. it does not also presume that all nodes might have undisclosed shadows); or\n // it might be a falsy value, which means shadow DOM support is disabled\n // Since we didn't find it sitting in an undisclosed shadow (or shadows are disabled)\n // now we can just test to see if it would normally be visible or not, provided it's\n // attached to the main document.\n // NOTE: We must consider case where node is inside a shadow DOM and given directly to\n // `isTabbable()` or `isFocusable()` -- regardless of `getShadowRoot` option setting.\n\n\n if (nodeIsAttached) {\n // this works wherever the node is: if there's at least one client rect, it's\n // somehow displayed; it also covers the CSS 'display: contents' case where the\n // node itself is hidden in place of its contents; and there's no need to search\n // up the hierarchy either\n return !node.getClientRects().length;\n } // Else, the node isn't attached to the document, which means the `getClientRects()`\n // API will __always__ return zero rects (this can happen, for example, if React\n // is used to render nodes onto a detached tree, as confirmed in this thread:\n // https://github.com/facebook/react/issues/9117#issuecomment-284228870)\n //\n // It also means that even window.getComputedStyle(node).display will return `undefined`\n // because styles are only computed for nodes that are in the document.\n //\n // NOTE: THIS HAS BEEN THE CASE FOR YEARS. It is not new, nor is it caused by tabbable\n // somehow. Though it was never stated officially, anyone who has ever used tabbable\n // APIs on nodes in detached containers has actually implicitly used tabbable in what\n // was later (as of v5.2.0 on Apr 9, 2021) called `displayCheck=\"none\"` mode -- essentially\n // considering __everything__ to be visible because of the innability to determine styles.\n\n } else if (displayCheck === 'non-zero-area') {\n // NOTE: Even though this tests that the node's client rect is non-zero to determine\n // whether it's displayed, and that a detached node will __always__ have a zero-area\n // client rect, we don't special-case for whether the node is attached or not. In\n // this mode, we do want to consider nodes that have a zero area to be hidden at all\n // times, and that includes attached or not.\n return isZeroArea(node);\n } // visible, as far as we can tell, or per current `displayCheck` mode\n\n\n return false;\n}; // form fields (nested) inside a disabled fieldset are not focusable/tabbable\n// unless they are in the _first_ <legend> element of the top-most disabled\n// fieldset\n\n\nvar isDisabledFromFieldset = function isDisabledFromFieldset(node) {\n if (/^(INPUT|BUTTON|SELECT|TEXTAREA)$/.test(node.tagName)) {\n var parentNode = node.parentElement; // check if `node` is contained in a disabled <fieldset>\n\n while (parentNode) {\n if (parentNode.tagName === 'FIELDSET' && parentNode.disabled) {\n // look for the first <legend> among the children of the disabled <fieldset>\n for (var i = 0; i < parentNode.children.length; i++) {\n var child = parentNode.children.item(i); // when the first <legend> (in document order) is found\n\n if (child.tagName === 'LEGEND') {\n // if its parent <fieldset> is not nested in another disabled <fieldset>,\n // return whether `node` is a descendant of its first <legend>\n return matches.call(parentNode, 'fieldset[disabled] *') ? true : !child.contains(node);\n }\n } // the disabled <fieldset> containing `node` has no <legend>\n\n\n return true;\n }\n\n parentNode = parentNode.parentElement;\n }\n } // else, node's tabbable/focusable state should not be affected by a fieldset's\n // enabled/disabled state\n\n\n return false;\n};\n\nvar isNodeMatchingSelectorFocusable = function isNodeMatchingSelectorFocusable(options, node) {\n if (node.disabled || isHiddenInput(node) || isHidden(node, options) || // For a details element with a summary, the summary element gets the focus\n isDetailsWithSummary(node) || isDisabledFromFieldset(node)) {\n return false;\n }\n\n return true;\n};\n\nvar isNodeMatchingSelectorTabbable = function isNodeMatchingSelectorTabbable(options, node) {\n if (isNonTabbableRadio(node) || getTabindex(node) < 0 || !isNodeMatchingSelectorFocusable(options, node)) {\n return false;\n }\n\n return true;\n};\n\nvar isValidShadowRootTabbable = function isValidShadowRootTabbable(shadowHostNode) {\n var tabIndex = parseInt(shadowHostNode.getAttribute('tabindex'), 10);\n\n if (isNaN(tabIndex) || tabIndex >= 0) {\n return true;\n } // If a custom element has an explicit negative tabindex,\n // browsers will not allow tab targeting said element's children.\n\n\n return false;\n};\n/**\n * @param {Array.<Element|CandidatesScope>} candidates\n * @returns Element[]\n */\n\n\nvar sortByOrder = function sortByOrder(candidates) {\n var regularTabbables = [];\n var orderedTabbables = [];\n candidates.forEach(function (item, i) {\n var isScope = !!item.scope;\n var element = isScope ? item.scope : item;\n var candidateTabindex = getTabindex(element, isScope);\n var elements = isScope ? sortByOrder(item.candidates) : element;\n\n if (candidateTabindex === 0) {\n isScope ? regularTabbables.push.apply(regularTabbables, elements) : regularTabbables.push(element);\n } else {\n orderedTabbables.push({\n documentOrder: i,\n tabIndex: candidateTabindex,\n item: item,\n isScope: isScope,\n content: elements\n });\n }\n });\n return orderedTabbables.sort(sortOrderedTabbables).reduce(function (acc, sortable) {\n sortable.isScope ? acc.push.apply(acc, sortable.content) : acc.push(sortable.content);\n return acc;\n }, []).concat(regularTabbables);\n};\n\nvar tabbable = function tabbable(el, options) {\n options = options || {};\n var candidates;\n\n if (options.getShadowRoot) {\n candidates = getCandidatesIteratively([el], options.includeContainer, {\n filter: isNodeMatchingSelectorTabbable.bind(null, options),\n flatten: false,\n getShadowRoot: options.getShadowRoot,\n shadowRootFilter: isValidShadowRootTabbable\n });\n } else {\n candidates = getCandidates(el, options.includeContainer, isNodeMatchingSelectorTabbable.bind(null, options));\n }\n\n return sortByOrder(candidates);\n};\n\nvar focusable = function focusable(el, options) {\n options = options || {};\n var candidates;\n\n if (options.getShadowRoot) {\n candidates = getCandidatesIteratively([el], options.includeContainer, {\n filter: isNodeMatchingSelectorFocusable.bind(null, options),\n flatten: true,\n getShadowRoot: options.getShadowRoot\n });\n } else {\n candidates = getCandidates(el, options.includeContainer, isNodeMatchingSelectorFocusable.bind(null, options));\n }\n\n return candidates;\n};\n\nvar isTabbable = function isTabbable(node, options) {\n options = options || {};\n\n if (!node) {\n throw new Error('No node provided');\n }\n\n if (matches.call(node, candidateSelector) === false) {\n return false;\n }\n\n return isNodeMatchingSelectorTabbable(options, node);\n};\n\nvar focusableCandidateSelector = /* #__PURE__ */candidateSelectors.concat('iframe').join(',');\n\nvar isFocusable = function isFocusable(node, options) {\n options = options || {};\n\n if (!node) {\n throw new Error('No node provided');\n }\n\n if (matches.call(node, focusableCandidateSelector) === false) {\n return false;\n }\n\n return isNodeMatchingSelectorFocusable(options, node);\n};\n\nexport { focusable, isFocusable, isTabbable, tabbable };\n//# sourceMappingURL=index.esm.js.map\n"],"names":[],"sourceRoot":""}