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'start' : 'end';\n\tconst offset = range[ `${ position }Offset` ];\n\tif ( offset !== extentOffset ) {\n\t\treturn false;\n\t}\n\n\t// If confirmed to be at extent, traverse up through DOM, verifying that\n\t// the node is at first or last child for reverse or forward respectively.\n\t// Continue until container is reached.\n\tconst order = isReverse ? 'first' : 'last';\n\twhile ( node !== container ) {\n\t\tconst parentNode = node.parentNode;\n\t\tif ( parentNode[ `${ order }Child` ] !== node ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tnode = parentNode;\n\t}\n\n\t// If reached, range is assumed to be at edge.\n\treturn true;\n}\n\n/**\n * Check whether the selection is vertically at the edge of the container.\n *\n * @param {Element} container Focusable element.\n * @param {boolean} isReverse Set to true to check top, false for bottom.\n *\n * @return {boolean} True if at the edge, false if not.\n */\nexport function isVerticalEdge( container, isReverse ) {\n\tif ( includes( [ 'INPUT', 'TEXTAREA' ], container.tagName ) ) {\n\t\treturn isHorizontalEdge( container, isReverse );\n\t}\n\n\tif ( ! container.isContentEditable ) {\n\t\treturn true;\n\t}\n\n\tconst selection = window.getSelection();\n\tconst range = selection.rangeCount ? selection.getRangeAt( 0 ) : null;\n\tif ( ! range ) {\n\t\treturn false;\n\t}\n\n\tconst rangeRect = getRectangleFromRange( range );\n\n\tif ( ! rangeRect ) {\n\t\treturn false;\n\t}\n\n\tconst buffer = rangeRect.height / 2;\n\tconst editableRect = container.getBoundingClientRect();\n\n\t// Too low.\n\tif ( isReverse && rangeRect.top - buffer > editableRect.top ) {\n\t\treturn false;\n\t}\n\n\t// Too high.\n\tif ( ! isReverse && rangeRect.bottom + buffer < editableRect.bottom ) {\n\t\treturn false;\n\t}\n\n\treturn true;\n}\n\n/**\n * Get the rectangle of a given Range.\n *\n * @param {Range} range The range.\n *\n * @return {DOMRect} The rectangle.\n */\nexport function getRectangleFromRange( range ) {\n\t// For uncollapsed ranges, get the rectangle that bounds the contents of the\n\t// range; this a rectangle enclosing the union of the bounding rectangles\n\t// for all the elements in the range.\n\tif ( ! range.collapsed ) {\n\t\treturn range.getBoundingClientRect();\n\t}\n\n\tlet rect = range.getClientRects()[ 0 ];\n\n\t// If the collapsed range starts (and therefore ends) at an element node,\n\t// `getClientRects` can be empty in some browsers. This can be resolved\n\t// by adding a temporary text node with zero-width space to the range.\n\t//\n\t// See: https://stackoverflow.com/a/6847328/995445\n\tif ( ! rect ) {\n\t\tconst padNode = document.createTextNode( '\\u200b' );\n\t\trange.insertNode( padNode );\n\t\trect = range.getClientRects()[ 0 ];\n\t\tpadNode.parentNode.removeChild( padNode );\n\t}\n\n\treturn rect;\n}\n\n/**\n * Get the rectangle for the selection in a container.\n *\n * @param {Element} container Editable container.\n *\n * @return {?DOMRect} The rectangle.\n */\nexport function computeCaretRect( container ) {\n\tif ( ! container.isContentEditable ) {\n\t\treturn;\n\t}\n\n\tconst selection = window.getSelection();\n\tconst range = selection.rangeCount ? selection.getRangeAt( 0 ) : null;\n\n\tif ( ! range ) {\n\t\treturn;\n\t}\n\n\treturn getRectangleFromRange( range );\n}\n\n/**\n * Places the caret at start or end of a given element.\n *\n * @param {Element} container Focusable element.\n * @param {boolean} isReverse True for end, false for start.\n */\nexport function placeCaretAtHorizontalEdge( container, isReverse ) {\n\tif ( ! container ) {\n\t\treturn;\n\t}\n\n\tif ( includes( [ 'INPUT', 'TEXTAREA' ], container.tagName ) ) {\n\t\tcontainer.focus();\n\t\tif ( isReverse ) {\n\t\t\tcontainer.selectionStart = container.value.length;\n\t\t\tcontainer.selectionEnd = container.value.length;\n\t\t} else {\n\t\t\tcontainer.selectionStart = 0;\n\t\t\tcontainer.selectionEnd = 0;\n\t\t}\n\t\treturn;\n\t}\n\n\tcontainer.focus();\n\n\tif ( ! container.isContentEditable ) {\n\t\treturn;\n\t}\n\n\t// Select on extent child of the container, not the container itself. This\n\t// avoids the selection always being `endOffset` of 1 when placed at end,\n\t// where `startContainer`, `endContainer` would always be container itself.\n\tconst rangeTarget = container[ isReverse ? 'lastChild' : 'firstChild' ];\n\n\t// If no range target, it implies that the container is empty. Focusing is\n\t// sufficient for caret to be placed correctly.\n\tif ( ! rangeTarget ) {\n\t\treturn;\n\t}\n\n\tconst selection = window.getSelection();\n\tconst range = document.createRange();\n\n\trange.selectNodeContents( rangeTarget );\n\trange.collapse( ! isReverse );\n\n\tselection.removeAllRanges();\n\tselection.addRange( range );\n}\n\n/**\n * Polyfill.\n * Get a collapsed range for a given point.\n *\n * @see https://developer.mozilla.org/en-US/docs/Web/API/Document/caretRangeFromPoint\n *\n * @param {Document} doc The document of the range.\n * @param {number}    x   Horizontal position within the current viewport.\n * @param {number}    y   Vertical position within the current viewport.\n *\n * @return {?Range} The best range for the given point.\n */\nfunction caretRangeFromPoint( doc, x, y ) {\n\tif ( doc.caretRangeFromPoint ) {\n\t\treturn doc.caretRangeFromPoint( x, y );\n\t}\n\n\tif ( ! doc.caretPositionFromPoint ) {\n\t\treturn null;\n\t}\n\n\tconst point = doc.caretPositionFromPoint( x, y );\n\n\t// If x or y are negative, outside viewport, or there is no text entry node.\n\t// https://developer.mozilla.org/en-US/docs/Web/API/Document/caretRangeFromPoint\n\tif ( ! point ) {\n\t\treturn null;\n\t}\n\n\tconst range = doc.createRange();\n\n\trange.setStart( point.offsetNode, point.offset );\n\trange.collapse( true );\n\n\treturn range;\n}\n\n/**\n * Get a collapsed range for a given point.\n * Gives the container a temporary high z-index (above any UI).\n * This is preferred over getting the UI nodes and set styles there.\n *\n * @param {Document} doc       The document of the range.\n * @param {number}    x         Horizontal position within the current viewport.\n * @param {number}    y         Vertical position within the current viewport.\n * @param {Element}  container Container in which the range is expected to be found.\n *\n * @return {?Range} The best range for the given point.\n */\nfunction hiddenCaretRangeFromPoint( doc, x, y, container ) {\n\tcontainer.style.zIndex = '10000';\n\n\tconst range = caretRangeFromPoint( doc, x, y );\n\n\tcontainer.style.zIndex = null;\n\n\treturn range;\n}\n\n/**\n * Places the caret at the top or bottom of a given element.\n *\n * @param {Element} container           Focusable element.\n * @param {boolean} isReverse           True for bottom, false for top.\n * @param {DOMRect} [rect]              The rectangle to position the caret with.\n * @param {boolean} [mayUseScroll=true] True to allow scrolling, false to disallow.\n */\nexport function placeCaretAtVerticalEdge( container, isReverse, rect, mayUseScroll = true ) {\n\tif ( ! container ) {\n\t\treturn;\n\t}\n\n\tif ( ! rect || ! container.isContentEditable ) {\n\t\tplaceCaretAtHorizontalEdge( container, isReverse );\n\t\treturn;\n\t}\n\n\t// Offset by a buffer half the height of the caret rect. This is needed\n\t// because caretRangeFromPoint may default to the end of the selection if\n\t// offset is too close to the edge. It's unclear how to precisely calculate\n\t// this threshold; it may be the padded area of some combination of line\n\t// height, caret height, and font size. The buffer offset is effectively\n\t// equivalent to a point at half the height of a line of text.\n\tconst buffer = rect.height / 2;\n\tconst editableRect = container.getBoundingClientRect();\n\tconst x = rect.left;\n\tconst y = isReverse ? ( editableRect.bottom - buffer ) : ( editableRect.top + buffer );\n\tconst selection = window.getSelection();\n\n\tlet range = hiddenCaretRangeFromPoint( document, x, y, container );\n\n\tif ( ! range || ! container.contains( range.startContainer ) ) {\n\t\tif ( mayUseScroll && (\n\t\t\t( ! range || ! range.startContainer ) ||\n\t\t\t\t! range.startContainer.contains( container ) ) ) {\n\t\t\t// Might be out of view.\n\t\t\t// Easier than attempting to calculate manually.\n\t\t\tcontainer.scrollIntoView( isReverse );\n\t\t\tplaceCaretAtVerticalEdge( container, isReverse, rect, false );\n\t\t\treturn;\n\t\t}\n\n\t\tplaceCaretAtHorizontalEdge( container, isReverse );\n\t\treturn;\n\t}\n\n\t// Check if the closest text node is actually further away.\n\t// If so, attempt to get the range again with the y position adjusted to get the right offset.\n\tif ( range.startContainer.nodeType === TEXT_NODE ) {\n\t\tconst parentNode = range.startContainer.parentNode;\n\t\tconst parentRect = parentNode.getBoundingClientRect();\n\t\tconst side = isReverse ? 'bottom' : 'top';\n\t\tconst padding = parseInt( getComputedStyle( parentNode ).getPropertyValue( `padding-${ side }` ), 10 ) || 0;\n\t\tconst actualY = isReverse ? ( parentRect.bottom - padding - buffer ) : ( parentRect.top + padding + buffer );\n\n\t\tif ( y !== actualY ) {\n\t\t\trange = hiddenCaretRangeFromPoint( document, x, actualY, container );\n\t\t}\n\t}\n\n\tselection.removeAllRanges();\n\tselection.addRange( range );\n\tcontainer.focus();\n\t// Editable was already focussed, it goes back to old range...\n\t// This fixes it.\n\tselection.removeAllRanges();\n\tselection.addRange( range );\n}\n\n/**\n * Check whether the given element is a text field, where text field is defined\n * by the ability to select within the input, or that it is contenteditable.\n *\n * See: https://html.spec.whatwg.org/#textFieldSelection\n *\n * @param {HTMLElement} element The HTML element.\n *\n * @return {boolean} True if the element is an text field, false if not.\n */\nexport function isTextField( element ) {\n\ttry {\n\t\tconst { nodeName, selectionStart, contentEditable } = element;\n\n\t\treturn (\n\t\t\t( nodeName === 'INPUT' && selectionStart !== null ) ||\n\t\t\t( nodeName === 'TEXTAREA' ) ||\n\t\t\tcontentEditable === 'true'\n\t\t);\n\t} catch ( error ) {\n\t\t// Safari throws an exception when trying to get `selectionStart`\n\t\t// on non-text <input> elements (which, understandably, don't\n\t\t// have the text selection API). We catch this via a try/catch\n\t\t// block, as opposed to a more explicit check of the element's\n\t\t// input types, because of Safari's non-standard behavior. This\n\t\t// also means we don't have to worry about the list of input\n\t\t// types that support `selectionStart` changing as the HTML spec\n\t\t// evolves over time.\n\t\treturn false;\n\t}\n}\n\n/**\n * Check wether the current document has a selection.\n * This checks both for focus in an input field and general text selection.\n *\n * @return {boolean} True if there is selection, false if not.\n */\nexport function documentHasSelection() {\n\tif ( isTextField( document.activeElement ) ) {\n\t\treturn true;\n\t}\n\n\tconst selection = window.getSelection();\n\tconst range = selection.rangeCount ? selection.getRangeAt( 0 ) : null;\n\n\treturn range && ! range.collapsed;\n}\n\n/**\n * Check whether the contents of the element have been entirely selected.\n * Returns true if there is no possibility of selection.\n *\n * @param {Element} element The element to check.\n *\n * @return {boolean} True if entirely selected, false if not.\n */\nexport function isEntirelySelected( element ) {\n\tif ( includes( [ 'INPUT', 'TEXTAREA' ], element.nodeName ) ) {\n\t\treturn element.selectionStart === 0 && element.value.length === element.selectionEnd;\n\t}\n\n\tif ( ! element.isContentEditable ) {\n\t\treturn true;\n\t}\n\n\tconst selection = window.getSelection();\n\tconst range = selection.rangeCount ? selection.getRangeAt( 0 ) : null;\n\n\tif ( ! range ) {\n\t\treturn true;\n\t}\n\n\tconst { startContainer, endContainer, startOffset, endOffset } = range;\n\n\treturn (\n\t\tstartContainer === element &&\n\t\tendContainer === element &&\n\t\tstartOffset === 0 &&\n\t\tendOffset === element.childNodes.length\n\t);\n}\n\n/**\n * Given a DOM node, finds the closest scrollable container node.\n *\n * @param {Element} node Node from which to start.\n *\n * @return {?Element} Scrollable container node, if found.\n */\nexport function getScrollContainer( node ) {\n\tif ( ! node ) {\n\t\treturn;\n\t}\n\n\t// Scrollable if scrollable height exceeds displayed...\n\tif ( node.scrollHeight > node.clientHeight ) {\n\t\t// ...except when overflow is defined to be hidden or visible\n\t\tconst { overflowY } = window.getComputedStyle( node );\n\t\tif ( /(auto|scroll)/.test( overflowY ) ) {\n\t\t\treturn node;\n\t\t}\n\t}\n\n\t// Continue traversing\n\treturn getScrollContainer( node.parentNode );\n}\n\n/**\n * Returns the closest positioned element, or null under any of the conditions\n * of the offsetParent specification. Unlike offsetParent, this function is not\n * limited to HTMLElement and accepts any Node (e.g. Node.TEXT_NODE).\n *\n * @see https://drafts.csswg.org/cssom-view/#dom-htmlelement-offsetparent\n *\n * @param {Node} node Node from which to find offset parent.\n *\n * @return {?Node} Offset parent.\n */\nexport function getOffsetParent( node ) {\n\t// Cannot retrieve computed style or offset parent only anything other than\n\t// an element node, so find the closest element node.\n\tlet closestElement;\n\twhile ( ( closestElement = node.parentNode ) ) {\n\t\tif ( closestElement.nodeType === ELEMENT_NODE ) {\n\t\t\tbreak;\n\t\t}\n\t}\n\n\tif ( ! closestElement ) {\n\t\treturn null;\n\t}\n\n\t// If the closest element is already positioned, return it, as offsetParent\n\t// does not otherwise consider the node itself.\n\tif ( getComputedStyle( closestElement ).position !== 'static' ) {\n\t\treturn closestElement;\n\t}\n\n\treturn closestElement.offsetParent;\n}\n\n/**\n * Given two DOM nodes, replaces the former with the latter in the DOM.\n *\n * @param {Element} processedNode Node to be removed.\n * @param {Element} newNode       Node to be inserted in its place.\n * @return {void}\n */\nexport function replace( processedNode, newNode ) {\n\tinsertAfter( newNode, processedNode.parentNode );\n\tremove( processedNode );\n}\n\n/**\n * Given a DOM node, removes it from the DOM.\n *\n * @param {Element} node Node to be removed.\n * @return {void}\n */\nexport function remove( node ) {\n\tnode.parentNode.removeChild( node );\n}\n\n/**\n * Given two DOM nodes, inserts the former in the DOM as the next sibling of\n * the latter.\n *\n * @param {Element} newNode       Node to be inserted.\n * @param {Element} referenceNode Node after which to perform the insertion.\n * @return {void}\n */\nexport function insertAfter( newNode, referenceNode ) {\n\treferenceNode.parentNode.insertBefore( newNode, referenceNode.nextSibling );\n}\n\n/**\n * Unwrap the given node. This means any child nodes are moved to the parent.\n *\n * @param {Node} node The node to unwrap.\n *\n * @return {void}\n */\nexport function unwrap( node ) {\n\tconst parent = node.parentNode;\n\n\twhile ( node.firstChild ) {\n\t\tparent.insertBefore( node.firstChild, node );\n\t}\n\n\tparent.removeChild( node );\n}\n\n/**\n * Replaces the given node with a new node with the given tag name.\n *\n * @param {Element}  node    The node to replace\n * @param {string}   tagName The new tag name.\n * @param {Document} doc     The document of the node.\n *\n * @return {Element} The new node.\n */\nexport function replaceTag( node, tagName, doc ) {\n\tconst newNode = doc.createElement( tagName );\n\n\twhile ( node.firstChild ) {\n\t\tnewNode.appendChild( node.firstChild );\n\t}\n\n\tnode.parentNode.replaceChild( newNode, node );\n\n\treturn newNode;\n}\n","/**\n * References:\n *\n * Focusable:\n *  - https://www.w3.org/TR/html5/editing.html#focus-management\n *\n * Sequential focus navigation:\n *  - https://www.w3.org/TR/html5/editing.html#sequential-focus-navigation-and-the-tabindex-attribute\n *\n * Disabled elements:\n *  - https://www.w3.org/TR/html5/disabled-elements.html#disabled-elements\n *\n * getClientRects algorithm (requiring layout box):\n *  - https://www.w3.org/TR/cssom-view-1/#extension-to-the-element-interface\n *\n * AREA elements associated with an IMG:\n *  - https://w3c.github.io/html/editing.html#data-model\n */\n\nconst SELECTOR = [\n\t'[tabindex]',\n\t'a[href]',\n\t'button:not([disabled])',\n\t'input:not([type=\"hidden\"]):not([disabled])',\n\t'select:not([disabled])',\n\t'textarea:not([disabled])',\n\t'iframe',\n\t'object',\n\t'embed',\n\t'area[href]',\n\t'[contenteditable]:not([contenteditable=false])',\n].join( ',' );\n\n/**\n * Returns true if the specified element is visible (i.e. neither display: none\n * nor visibility: hidden).\n *\n * @param {Element} element DOM element to test.\n *\n * @return {boolean} Whether element is visible.\n */\nfunction isVisible( element ) {\n\treturn (\n\t\telement.offsetWidth > 0 ||\n\t\telement.offsetHeight > 0 ||\n\t\telement.getClientRects().length > 0\n\t);\n}\n\n/**\n * Returns true if the specified area element is a valid focusable element, or\n * false otherwise. Area is only focusable if within a map where a named map\n * referenced by an image somewhere in the document.\n *\n * @param {Element} element DOM area element to test.\n *\n * @return {boolean} Whether area element is valid for focus.\n */\nfunction isValidFocusableArea( element ) {\n\tconst map = element.closest( 'map[name]' );\n\tif ( ! map ) {\n\t\treturn false;\n\t}\n\n\tconst img = document.querySelector( 'img[usemap=\"#' + map.name + '\"]' );\n\treturn !! img && isVisible( img );\n}\n\n/**\n * Returns all focusable elements within a given context.\n *\n * @param {Element} context Element in which to search.\n *\n * @return {Element[]} Focusable elements.\n */\nexport function find( context ) {\n\tconst elements = context.querySelectorAll( SELECTOR );\n\n\treturn [ ...elements ].filter( ( element ) => {\n\t\tif ( ! isVisible( element ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst { nodeName } = element;\n\t\tif ( 'AREA' === nodeName ) {\n\t\t\treturn isValidFocusableArea( element );\n\t\t}\n\n\t\treturn true;\n\t} );\n}\n","/**\n * Internal dependencies\n */\nimport * as focusable from './focusable';\nimport * as tabbable from './tabbable';\n\nexport const focus = { focusable, tabbable };\n\nexport * from './dom';\n","/**\n * Internal dependencies\n */\nimport { find as findFocusable } from './focusable';\n\n/**\n * Returns the tab index of the given element. In contrast with the tabIndex\n * property, this normalizes the default (0) to avoid browser inconsistencies,\n * operating under the assumption that this function is only ever called with a\n * focusable node.\n *\n * @see https://bugzilla.mozilla.org/show_bug.cgi?id=1190261\n *\n * @param {Element} element Element from which to retrieve.\n *\n * @return {?number} Tab index of element (default 0).\n */\nfunction getTabIndex( element ) {\n\tconst tabIndex = element.getAttribute( 'tabindex' );\n\treturn tabIndex === null ? 0 : parseInt( tabIndex, 10 );\n}\n\n/**\n * Returns true if the specified element is tabbable, or false otherwise.\n *\n * @param {Element} element Element to test.\n *\n * @return {boolean} Whether element is tabbable.\n */\nexport function isTabbableIndex( element ) {\n\treturn getTabIndex( element ) !== -1;\n}\n\n/**\n * An array map callback, returning an object with the element value and its\n * array index location as properties. This is used to emulate a proper stable\n * sort where equal tabIndex should be left in order of their occurrence in the\n * document.\n *\n * @param {Element} element Element.\n * @param {number}  index   Array index of element.\n *\n * @return {Object} Mapped object with element, index.\n */\nfunction mapElementToObjectTabbable( element, index ) {\n\treturn { element, index };\n}\n\n/**\n * An array map callback, returning an element of the given mapped object's\n * element value.\n *\n * @param {Object} object Mapped object with index.\n *\n * @return {Element} Mapped object element.\n */\nfunction mapObjectTabbableToElement( object ) {\n\treturn object.element;\n}\n\n/**\n * A sort comparator function used in comparing two objects of mapped elements.\n *\n * @see mapElementToObjectTabbable\n *\n * @param {Object} a First object to compare.\n * @param {Object} b Second object to compare.\n *\n * @return {number} Comparator result.\n */\nfunction compareObjectTabbables( a, b ) {\n\tconst aTabIndex = getTabIndex( a.element );\n\tconst bTabIndex = getTabIndex( b.element );\n\n\tif ( aTabIndex === bTabIndex ) {\n\t\treturn a.index - b.index;\n\t}\n\n\treturn aTabIndex - bTabIndex;\n}\n\nexport function find( context ) {\n\treturn findFocusable( context )\n\t\t.filter( isTabbableIndex )\n\t\t.map( mapElementToObjectTabbable )\n\t\t.sort( compareObjectTabbables )\n\t\t.map( mapObjectTabbableToElement );\n}\n","(function() { module.exports = this[\"lodash\"]; }());"],"sourceRoot":""}