html: remove modal/polyfill code

2 files changed, 0 insertions, 903 deletions

diff --git a/fatcat_scholar/static/dialog-polyfill.css b/fatcat_scholar/static/dialog-polyfill.css
deleted file mode 100644
index 6b38bf0..0000000
--- a/fatcat_scholar/static/dialog-polyfill.css
+++ /dev/null
@@ -1,37 +0,0 @@
-dialog {
-  position: absolute;
-  left: 0; right: 0;
-  width: -moz-fit-content;
-  width: -webkit-fit-content;
-  width: fit-content;
-  height: -moz-fit-content;
-  height: -webkit-fit-content;
-  height: fit-content;
-  margin: auto;
-  border: solid;
-  padding: 1em;
-  background: white;
-  color: black;
-  display: block;
-}
-
-dialog:not([open]) {
-  display: none;
-}
-
-dialog + .backdrop {
-  position: fixed;
-  top: 0; right: 0; bottom: 0; left: 0;
-  background: rgba(0,0,0,0.1);
-}
-
-._dialog_overlay {
-  position: fixed;
-  top: 0; right: 0; bottom: 0; left: 0;
-}
-
-dialog.fixed {
-  position: fixed;
-  top: 50%;
-  transform: translate(0, -50%);
-}
\ No newline at end of file
diff --git a/fatcat_scholar/static/dialog-polyfill.js b/fatcat_scholar/static/dialog-polyfill.js
deleted file mode 100644
index aee7d96..0000000
--- a/fatcat_scholar/static/dialog-polyfill.js
+++ /dev/null
@@ -1,866 +0,0 @@
-(function (global, factory) {
-  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
-  typeof define === 'function' && define.amd ? define(factory) :
-  (global = global || self, global.dialogPolyfill = factory());
-}(this, function () { 'use strict';
-
-  // nb. This is for IE10 and lower _only_.
-  var supportCustomEvent = window.CustomEvent;
-  if (!supportCustomEvent || typeof supportCustomEvent === 'object') {
-    supportCustomEvent = function CustomEvent(event, x) {
-      x = x || {};
-      var ev = document.createEvent('CustomEvent');
-      ev.initCustomEvent(event, !!x.bubbles, !!x.cancelable, x.detail || null);
-      return ev;
-    };
-    supportCustomEvent.prototype = window.Event.prototype;
-  }
-
-  /**
-   * Dispatches the passed event to both an "on<type>" handler as well as via the
-   * normal dispatch operation. Does not bubble.
-   *
-   * @param {!EventTarget} target
-   * @param {!Event} event
-   * @return {boolean}
-   */
-  function safeDispatchEvent(target, event) {
-    var check = 'on' + event.type.toLowerCase();
-    if (typeof target[check] === 'function') {
-      target[check](event);
-    }
-    return target.dispatchEvent(event);
-  }
-
-  /**
-   * @param {Element} el to check for stacking context
-   * @return {boolean} whether this el or its parents creates a stacking context
-   */
-  function createsStackingContext(el) {
-    while (el && el !== document.body) {
-      var s = window.getComputedStyle(el);
-      var invalid = function(k, ok) {
-        return !(s[k] === undefined || s[k] === ok);
-      };
-
-      if (s.opacity < 1 ||
-          invalid('zIndex', 'auto') ||
-          invalid('transform', 'none') ||
-          invalid('mixBlendMode', 'normal') ||
-          invalid('filter', 'none') ||
-          invalid('perspective', 'none') ||
-          s['isolation'] === 'isolate' ||
-          s.position === 'fixed' ||
-          s.webkitOverflowScrolling === 'touch') {
-        return true;
-      }
-      el = el.parentElement;
-    }
-    return false;
-  }
-
-  /**
-   * Finds the nearest <dialog> from the passed element.
-   *
-   * @param {Element} el to search from
-   * @return {HTMLDialogElement} dialog found
-   */
-  function findNearestDialog(el) {
-    while (el) {
-      if (el.localName === 'dialog') {
-        return /** @type {HTMLDialogElement} */ (el);
-      }
-      if (el.parentElement) {
-        el = el.parentElement;
-      } else if (el.parentNode) {
-        el = el.parentNode.host;
-      } else {
-        el = null;
-      }
-    }
-    return null;
-  }
-
-  /**
-   * Blur the specified element, as long as it's not the HTML body element.
-   * This works around an IE9/10 bug - blurring the body causes Windows to
-   * blur the whole application.
-   *
-   * @param {Element} el to blur
-   */
-  function safeBlur(el) {
-    // Find the actual focused element when the active element is inside a shadow root
-    while (el && el.shadowRoot && el.shadowRoot.activeElement) {
-      el = el.shadowRoot.activeElement;
-    }
-
-    if (el && el.blur && el !== document.body) {
-      el.blur();
-    }
-  }
-
-  /**
-   * @param {!NodeList} nodeList to search
-   * @param {Node} node to find
-   * @return {boolean} whether node is inside nodeList
-   */
-  function inNodeList(nodeList, node) {
-    for (var i = 0; i < nodeList.length; ++i) {
-      if (nodeList[i] === node) {
-        return true;
-      }
-    }
-    return false;
-  }
-
-  /**
-   * @param {HTMLFormElement} el to check
-   * @return {boolean} whether this form has method="dialog"
-   */
-  function isFormMethodDialog(el) {
-    if (!el || !el.hasAttribute('method')) {
-      return false;
-    }
-    return el.getAttribute('method').toLowerCase() === 'dialog';
-  }
-
-  /**
-   * @param {!DocumentFragment|!Element} hostElement
-   * @return {?Element}
-   */
-  function findFocusableElementWithin(hostElement) {
-    // Note that this is 'any focusable area'. This list is probably not exhaustive, but the
-    // alternative involves stepping through and trying to focus everything.
-    var opts = ['button', 'input', 'keygen', 'select', 'textarea'];
-    var query = opts.map(function(el) {
-      return el + ':not([disabled])';
-    });
-    // TODO(samthor): tabindex values that are not numeric are not focusable.
-    query.push('[tabindex]:not([disabled]):not([tabindex=""])');  // tabindex != "", not disabled
-    var target = hostElement.querySelector(query.join(', '));
-
-    if (!target && 'attachShadow' in Element.prototype) {
-      // If we haven't found a focusable target, see if the host element contains an element
-      // which has a shadowRoot.
-      // Recursively search for the first focusable item in shadow roots.
-      var elems = hostElement.querySelectorAll('*');
-      for (var i = 0; i < elems.length; i++) {
-        if (elems[i].tagName && elems[i].shadowRoot) {
-          target = findFocusableElementWithin(elems[i].shadowRoot);
-          if (target) {
-            break;
-          }
-        }
-      }
-    }
-    return target;
-  }
-
-  /**
-   * Determines if an element is attached to the DOM.
-   * @param {Element} element to check
-   * @return {boolean} whether the element is in DOM
-   */
-  function isConnected(element) {
-    return element.isConnected || document.body.contains(element);
-  }
-
-  /**
-   * @param {!Event} event
-   * @return {?Element}
-   */
-  function findFormSubmitter(event) {
-    if (event.submitter) {
-      return event.submitter;
-    }
-
-    var form = event.target;
-    if (!(form instanceof HTMLFormElement)) {
-      return null;
-    }
-
-    var submitter = dialogPolyfill.formSubmitter;
-    if (!submitter) {
-      var target = event.target;
-      var root = ('getRootNode' in target && target.getRootNode() || document);
-      submitter = root.activeElement;
-    }
-
-    if (!submitter || submitter.form !== form) {
-      return null;
-    }
-    return submitter;
-  }
-
-  /**
-   * @param {!Event} event
-   */
-  function maybeHandleSubmit(event) {
-    if (event.defaultPrevented) {
-      return;
-    }
-    var form = /** @type {!HTMLFormElement} */ (event.target);
-
-    // We'd have a value if we clicked on an imagemap.
-    var value = dialogPolyfill.imagemapUseValue;
-    var submitter = findFormSubmitter(event);
-    if (value === null && submitter) {
-      value = submitter.value;
-    }
-
-    // There should always be a dialog as this handler is added specifically on them, but check just
-    // in case.
-    var dialog = findNearestDialog(form);
-    if (!dialog) {
-      return;
-    }
-
-    // Prefer formmethod on the button.
-    var formmethod = submitter && submitter.getAttribute('formmethod') || form.getAttribute('method');
-    if (formmethod !== 'dialog') {
-      return;
-    }
-    event.preventDefault();
-
-    if (value != null) {
-      // nb. we explicitly check against null/undefined
-      dialog.close(value);
-    } else {
-      dialog.close();
-    }
-  }
-
-  /**
-   * @param {!HTMLDialogElement} dialog to upgrade
-   * @constructor
-   */
-  function dialogPolyfillInfo(dialog) {
-    this.dialog_ = dialog;
-    this.replacedStyleTop_ = false;
-    this.openAsModal_ = false;
-
-    // Set a11y role. Browsers that support dialog implicitly know this already.
-    if (!dialog.hasAttribute('role')) {
-      dialog.setAttribute('role', 'dialog');
-    }
-
-    dialog.show = this.show.bind(this);
-    dialog.showModal = this.showModal.bind(this);
-    dialog.close = this.close.bind(this);
-
-    dialog.addEventListener('submit', maybeHandleSubmit, false);
-
-    if (!('returnValue' in dialog)) {
-      dialog.returnValue = '';
-    }
-
-    if ('MutationObserver' in window) {
-      var mo = new MutationObserver(this.maybeHideModal.bind(this));
-      mo.observe(dialog, {attributes: true, attributeFilter: ['open']});
-    } else {
-      // IE10 and below support. Note that DOMNodeRemoved etc fire _before_ removal. They also
-      // seem to fire even if the element was removed as part of a parent removal. Use the removed
-      // events to force downgrade (useful if removed/immediately added).
-      var removed = false;
-      var cb = function() {
-        removed ? this.downgradeModal() : this.maybeHideModal();
-        removed = false;
-      }.bind(this);
-      var timeout;
-      var delayModel = function(ev) {
-        if (ev.target !== dialog) { return; }  // not for a child element
-        var cand = 'DOMNodeRemoved';
-        removed |= (ev.type.substr(0, cand.length) === cand);
-        window.clearTimeout(timeout);
-        timeout = window.setTimeout(cb, 0);
-      };
-      ['DOMAttrModified', 'DOMNodeRemoved', 'DOMNodeRemovedFromDocument'].forEach(function(name) {
-        dialog.addEventListener(name, delayModel);
-      });
-    }
-    // Note that the DOM is observed inside DialogManager while any dialog
-    // is being displayed as a modal, to catch modal removal from the DOM.
-
-    Object.defineProperty(dialog, 'open', {
-      set: this.setOpen.bind(this),
-      get: dialog.hasAttribute.bind(dialog, 'open')
-    });
-
-    this.backdrop_ = document.createElement('div');
-    this.backdrop_.className = 'backdrop';
-    this.backdrop_.addEventListener('mouseup'  , this.backdropMouseEvent_.bind(this));
-    this.backdrop_.addEventListener('mousedown', this.backdropMouseEvent_.bind(this));
-    this.backdrop_.addEventListener('click'    , this.backdropMouseEvent_.bind(this));
-  }
-
-  dialogPolyfillInfo.prototype = /** @type {HTMLDialogElement.prototype} */ ({
-
-    get dialog() {
-      return this.dialog_;
-    },
-
-    /**
-     * Maybe remove this dialog from the modal top layer. This is called when
-     * a modal dialog may no longer be tenable, e.g., when the dialog is no
-     * longer open or is no longer part of the DOM.
-     */
-    maybeHideModal: function() {
-      if (this.dialog_.hasAttribute('open') && isConnected(this.dialog_)) { return; }
-      this.downgradeModal();
-    },
-
-    /**
-     * Remove this dialog from the modal top layer, leaving it as a non-modal.
-     */
-    downgradeModal: function() {
-      if (!this.openAsModal_) { return; }
-      this.openAsModal_ = false;
-      this.dialog_.style.zIndex = '';
-
-      // This won't match the native <dialog> exactly because if the user set top on a centered
-      // polyfill dialog, that top gets thrown away when the dialog is closed. Not sure it's
-      // possible to polyfill this perfectly.
-      if (this.replacedStyleTop_) {
-        this.dialog_.style.top = '';
-        this.replacedStyleTop_ = false;
-      }
-
-      // Clear the backdrop and remove from the manager.
-      this.backdrop_.parentNode && this.backdrop_.parentNode.removeChild(this.backdrop_);
-      dialogPolyfill.dm.removeDialog(this);
-    },
-
-    /**
-     * @param {boolean} value whether to open or close this dialog
-     */
-    setOpen: function(value) {
-      if (value) {
-        this.dialog_.hasAttribute('open') || this.dialog_.setAttribute('open', '');
-      } else {
-        this.dialog_.removeAttribute('open');
-        this.maybeHideModal();  // nb. redundant with MutationObserver
-      }
-    },
-
-    /**
-     * Handles mouse events ('mouseup', 'mousedown', 'click') on the fake .backdrop element, redirecting them as if
-     * they were on the dialog itself.
-     *
-     * @param {!Event} e to redirect
-     */
-    backdropMouseEvent_: function(e) {
-      if (!this.dialog_.hasAttribute('tabindex')) {
-        // Clicking on the backdrop should move the implicit cursor, even if dialog cannot be
-        // focused. Create a fake thing to focus on. If the backdrop was _before_ the dialog, this
-        // would not be needed - clicks would move the implicit cursor there.
-        var fake = document.createElement('div');
-        this.dialog_.insertBefore(fake, this.dialog_.firstChild);
-        fake.tabIndex = -1;
-        fake.focus();
-        this.dialog_.removeChild(fake);
-      } else {
-        this.dialog_.focus();
-      }
-
-      var redirectedEvent = document.createEvent('MouseEvents');
-      redirectedEvent.initMouseEvent(e.type, e.bubbles, e.cancelable, window,
-          e.detail, e.screenX, e.screenY, e.clientX, e.clientY, e.ctrlKey,
-          e.altKey, e.shiftKey, e.metaKey, e.button, e.relatedTarget);
-      this.dialog_.dispatchEvent(redirectedEvent);
-      e.stopPropagation();
-    },
-
-    /**
-     * Focuses on the first focusable element within the dialog. This will always blur the current
-     * focus, even if nothing within the dialog is found.
-     */
-    focus_: function() {
-      // Find element with `autofocus` attribute, or fall back to the first form/tabindex control.
-      var target = this.dialog_.querySelector('[autofocus]:not([disabled])');
-      if (!target && this.dialog_.tabIndex >= 0) {
-        target = this.dialog_;
-      }
-      if (!target) {
-        target = findFocusableElementWithin(this.dialog_);
-      }
-      safeBlur(document.activeElement);
-      target && target.focus();
-    },
-
-    /**
-     * Sets the zIndex for the backdrop and dialog.
-     *
-     * @param {number} dialogZ
-     * @param {number} backdropZ
-     */
-    updateZIndex: function(dialogZ, backdropZ) {
-      if (dialogZ < backdropZ) {
-        throw new Error('dialogZ should never be < backdropZ');
-      }
-      this.dialog_.style.zIndex = dialogZ;
-      this.backdrop_.style.zIndex = backdropZ;
-    },
-
-    /**
-     * Shows the dialog. If the dialog is already open, this does nothing.
-     */
-    show: function() {
-      if (!this.dialog_.open) {
-        this.setOpen(true);
-        this.focus_();
-      }
-    },
-
-    /**
-     * Show this dialog modally.
-     */
-    showModal: function() {
-      if (this.dialog_.hasAttribute('open')) {
-        throw new Error('Failed to execute \'showModal\' on dialog: The element is already open, and therefore cannot be opened modally.');
-      }
-      if (!isConnected(this.dialog_)) {
-        throw new Error('Failed to execute \'showModal\' on dialog: The element is not in a Document.');
-      }
-      if (!dialogPolyfill.dm.pushDialog(this)) {
-        throw new Error('Failed to execute \'showModal\' on dialog: There are too many open modal dialogs.');
-      }
-
-      if (createsStackingContext(this.dialog_.parentElement)) {
-        console.warn('A dialog is being shown inside a stacking context. ' +
-            'This may cause it to be unusable. For more information, see this link: ' +
-            'https://github.com/GoogleChrome/dialog-polyfill/#stacking-context');
-      }
-
-      this.setOpen(true);
-      this.openAsModal_ = true;
-
-      // Optionally center vertically, relative to the current viewport.
-      if (dialogPolyfill.needsCentering(this.dialog_)) {
-        dialogPolyfill.reposition(this.dialog_);
-        this.replacedStyleTop_ = true;
-      } else {
-        this.replacedStyleTop_ = false;
-      }
-
-      // Insert backdrop.
-      this.dialog_.parentNode.insertBefore(this.backdrop_, this.dialog_.nextSibling);
-
-      // Focus on whatever inside the dialog.
-      this.focus_();
-    },
-
-    /**
-     * Closes this HTMLDialogElement. This is optional vs clearing the open
-     * attribute, however this fires a 'close' event.
-     *
-     * @param {string=} opt_returnValue to use as the returnValue
-     */
-    close: function(opt_returnValue) {
-      if (!this.dialog_.hasAttribute('open')) {
-        throw new Error('Failed to execute \'close\' on dialog: The element does not have an \'open\' attribute, and therefore cannot be closed.');
-      }
-      this.setOpen(false);
-
-      // Leave returnValue untouched in case it was set directly on the element
-      if (opt_returnValue !== undefined) {
-        this.dialog_.returnValue = opt_returnValue;
-      }
-
-      // Triggering "close" event for any attached listeners on the <dialog>.
-      var closeEvent = new supportCustomEvent('close', {
-        bubbles: false,
-        cancelable: false
-      });
-      safeDispatchEvent(this.dialog_, closeEvent);
-    }
-
-  });
-
-  var dialogPolyfill = {};
-
-  dialogPolyfill.reposition = function(element) {
-    var scrollTop = document.body.scrollTop || document.documentElement.scrollTop;
-    var topValue = scrollTop + (window.innerHeight - element.offsetHeight) / 2;
-    element.style.top = Math.max(scrollTop, topValue) + 'px';
-  };
-
-  dialogPolyfill.isInlinePositionSetByStylesheet = function(element) {
-    for (var i = 0; i < document.styleSheets.length; ++i) {
-      var styleSheet = document.styleSheets[i];
-      var cssRules = null;
-      // Some browsers throw on cssRules.
-      try {
-        cssRules = styleSheet.cssRules;
-      } catch (e) {}
-      if (!cssRules) { continue; }
-      for (var j = 0; j < cssRules.length; ++j) {
-        var rule = cssRules[j];
-        var selectedNodes = null;
-        // Ignore errors on invalid selector texts.
-        try {
-          selectedNodes = document.querySelectorAll(rule.selectorText);
-        } catch(e) {}
-        if (!selectedNodes || !inNodeList(selectedNodes, element)) {
-          continue;
-        }
-        var cssTop = rule.style.getPropertyValue('top');
-        var cssBottom = rule.style.getPropertyValue('bottom');
-        if ((cssTop && cssTop !== 'auto') || (cssBottom && cssBottom !== 'auto')) {
-          return true;
-        }
-      }
-    }
-    return false;
-  };
-
-  dialogPolyfill.needsCentering = function(dialog) {
-    var computedStyle = window.getComputedStyle(dialog);
-    if (computedStyle.position !== 'absolute') {
-      return false;
-    }
-
-    // We must determine whether the top/bottom specified value is non-auto.  In
-    // WebKit/Blink, checking computedStyle.top == 'auto' is sufficient, but
-    // Firefox returns the used value. So we do this crazy thing instead: check
-    // the inline style and then go through CSS rules.
-    if ((dialog.style.top !== 'auto' && dialog.style.top !== '') ||
-        (dialog.style.bottom !== 'auto' && dialog.style.bottom !== '')) {
-      return false;
-    }
-    return !dialogPolyfill.isInlinePositionSetByStylesheet(dialog);
-  };
-
-  /**
-   * @param {!Element} element to force upgrade
-   */
-  dialogPolyfill.forceRegisterDialog = function(element) {
-    if (window.HTMLDialogElement || element.showModal) {
-      console.warn('This browser already supports <dialog>, the polyfill ' +
-          'may not work correctly', element);
-    }
-    if (element.localName !== 'dialog') {
-      throw new Error('Failed to register dialog: The element is not a dialog.');
-    }
-    new dialogPolyfillInfo(/** @type {!HTMLDialogElement} */ (element));
-  };
-
-  /**
-   * @param {!Element} element to upgrade, if necessary
-   */
-  dialogPolyfill.registerDialog = function(element) {
-    if (!element.showModal) {
-      dialogPolyfill.forceRegisterDialog(element);
-    }
-  };
-
-  /**
-   * @constructor
-   */
-  dialogPolyfill.DialogManager = function() {
-    /** @type {!Array<!dialogPolyfillInfo>} */
-    this.pendingDialogStack = [];
-
-    var checkDOM = this.checkDOM_.bind(this);
-
-    // The overlay is used to simulate how a modal dialog blocks the document.
-    // The blocking dialog is positioned on top of the overlay, and the rest of
-    // the dialogs on the pending dialog stack are positioned below it. In the
-    // actual implementation, the modal dialog stacking is controlled by the
-    // top layer, where z-index has no effect.
-    this.overlay = document.createElement('div');
-    this.overlay.className = '_dialog_overlay';
-    this.overlay.addEventListener('click', function(e) {
-      this.forwardTab_ = undefined;
-      e.stopPropagation();
-      checkDOM([]);  // sanity-check DOM
-    }.bind(this));
-
-    this.handleKey_ = this.handleKey_.bind(this);
-    this.handleFocus_ = this.handleFocus_.bind(this);
-
-    this.zIndexLow_ = 100000;
-    this.zIndexHigh_ = 100000 + 150;
-
-    this.forwardTab_ = undefined;
-
-    if ('MutationObserver' in window) {
-      this.mo_ = new MutationObserver(function(records) {
-        var removed = [];
-        records.forEach(function(rec) {
-          for (var i = 0, c; c = rec.removedNodes[i]; ++i) {
-            if (!(c instanceof Element)) {
-              continue;
-            } else if (c.localName === 'dialog') {
-              removed.push(c);
-            }
-            removed = removed.concat(c.querySelectorAll('dialog'));
-          }
-        });
-        removed.length && checkDOM(removed);
-      });
-    }
-  };
-
-  /**
-   * Called on the first modal dialog being shown. Adds the overlay and related
-   * handlers.
-   */
-  dialogPolyfill.DialogManager.prototype.blockDocument = function() {
-    document.documentElement.addEventListener('focus', this.handleFocus_, true);
-    document.addEventListener('keydown', this.handleKey_);
-    this.mo_ && this.mo_.observe(document, {childList: true, subtree: true});
-  };
-
-  /**
-   * Called on the first modal dialog being removed, i.e., when no more modal
-   * dialogs are visible.
-   */
-  dialogPolyfill.DialogManager.prototype.unblockDocument = function() {
-    document.documentElement.removeEventListener('focus', this.handleFocus_, true);
-    document.removeEventListener('keydown', this.handleKey_);
-    this.mo_ && this.mo_.disconnect();
-  };
-
-  /**
-   * Updates the stacking of all known dialogs.
-   */
-  dialogPolyfill.DialogManager.prototype.updateStacking = function() {
-    var zIndex = this.zIndexHigh_;
-
-    for (var i = 0, dpi; dpi = this.pendingDialogStack[i]; ++i) {
-      dpi.updateZIndex(--zIndex, --zIndex);
-      if (i === 0) {
-        this.overlay.style.zIndex = --zIndex;
-      }
-    }
-
-    // Make the overlay a sibling of the dialog itself.
-    var last = this.pendingDialogStack[0];
-    if (last) {
-      var p = last.dialog.parentNode || document.body;
-      p.appendChild(this.overlay);
-    } else if (this.overlay.parentNode) {
-      this.overlay.parentNode.removeChild(this.overlay);
-    }
-  };
-
-  /**
-   * @param {Element} candidate to check if contained or is the top-most modal dialog
-   * @return {boolean} whether candidate is contained in top dialog
-   */
-  dialogPolyfill.DialogManager.prototype.containedByTopDialog_ = function(candidate) {
-    while (candidate = findNearestDialog(candidate)) {
-      for (var i = 0, dpi; dpi = this.pendingDialogStack[i]; ++i) {
-        if (dpi.dialog === candidate) {
-          return i === 0;  // only valid if top-most
-        }
-      }
-      candidate = candidate.parentElement;
-    }
-    return false;
-  };
-
-  dialogPolyfill.DialogManager.prototype.handleFocus_ = function(event) {
-    var target = event.composedPath ? event.composedPath()[0] : event.target;
-
-    if (this.containedByTopDialog_(target)) { return; }
-
-    if (document.activeElement === document.documentElement) { return; }
-
-    event.preventDefault();
-    event.stopPropagation();
-    safeBlur(/** @type {Element} */ (target));
-
-    if (this.forwardTab_ === undefined) { return; }  // move focus only from a tab key
-
-    var dpi = this.pendingDialogStack[0];
-    var dialog = dpi.dialog;
-    var position = dialog.compareDocumentPosition(target);
-    if (position & Node.DOCUMENT_POSITION_PRECEDING) {
-      if (this.forwardTab_) {
-        // forward
-        dpi.focus_();
-      } else if (target !== document.documentElement) {
-        // backwards if we're not already focused on <html>
-        document.documentElement.focus();
-      }
-    }
-
-    return false;
-  };
-
-  dialogPolyfill.DialogManager.prototype.handleKey_ = function(event) {
-    this.forwardTab_ = undefined;
-    if (event.keyCode === 27) {
-      event.preventDefault();
-      event.stopPropagation();
-      var cancelEvent = new supportCustomEvent('cancel', {
-        bubbles: false,
-        cancelable: true
-      });
-      var dpi = this.pendingDialogStack[0];
-      if (dpi && safeDispatchEvent(dpi.dialog, cancelEvent)) {
-        dpi.dialog.close();
-      }
-    } else if (event.keyCode === 9) {
-      this.forwardTab_ = !event.shiftKey;
-    }
-  };
-
-  /**
-   * Finds and downgrades any known modal dialogs that are no longer displayed. Dialogs that are
-   * removed and immediately readded don't stay modal, they become normal.
-   *
-   * @param {!Array<!HTMLDialogElement>} removed that have definitely been removed
-   */
-  dialogPolyfill.DialogManager.prototype.checkDOM_ = function(removed) {
-    // This operates on a clone because it may cause it to change. Each change also calls
-    // updateStacking, which only actually needs to happen once. But who removes many modal dialogs
-    // at a time?!
-    var clone = this.pendingDialogStack.slice();
-    clone.forEach(function(dpi) {
-      if (removed.indexOf(dpi.dialog) !== -1) {
-        dpi.downgradeModal();
-      } else {
-        dpi.maybeHideModal();
-      }
-    });
-  };
-
-  /**
-   * @param {!dialogPolyfillInfo} dpi
-   * @return {boolean} whether the dialog was allowed
-   */
-  dialogPolyfill.DialogManager.prototype.pushDialog = function(dpi) {
-    var allowed = (this.zIndexHigh_ - this.zIndexLow_) / 2 - 1;
-    if (this.pendingDialogStack.length >= allowed) {
-      return false;
-    }
-    if (this.pendingDialogStack.unshift(dpi) === 1) {
-      this.blockDocument();
-    }
-    this.updateStacking();
-    return true;
-  };
-
-  /**
-   * @param {!dialogPolyfillInfo} dpi
-   */
-  dialogPolyfill.DialogManager.prototype.removeDialog = function(dpi) {
-    var index = this.pendingDialogStack.indexOf(dpi);
-    if (index === -1) { return; }
-
-    this.pendingDialogStack.splice(index, 1);
-    if (this.pendingDialogStack.length === 0) {
-      this.unblockDocument();
-    }
-    this.updateStacking();
-  };
-
-  dialogPolyfill.dm = new dialogPolyfill.DialogManager();
-  dialogPolyfill.formSubmitter = null;
-  dialogPolyfill.imagemapUseValue = null;
-
-  /**
-   * Installs global handlers, such as click listers and native method overrides. These are needed
-   * even if a no dialog is registered, as they deal with <form method="dialog">.
-   */
-  if (window.HTMLDialogElement === undefined) {
-
-    /**
-     * If HTMLFormElement translates method="DIALOG" into 'get', then replace the descriptor with
-     * one that returns the correct value.
-     */
-    var testForm = document.createElement('form');
-    testForm.setAttribute('method', 'dialog');
-    if (testForm.method !== 'dialog') {
-      var methodDescriptor = Object.getOwnPropertyDescriptor(HTMLFormElement.prototype, 'method');
-      if (methodDescriptor) {
-        // nb. Some older iOS and older PhantomJS fail to return the descriptor. Don't do anything
-        // and don't bother to update the element.
-        var realGet = methodDescriptor.get;
-        methodDescriptor.get = function() {
-          if (isFormMethodDialog(this)) {
-            return 'dialog';
-          }
-          return realGet.call(this);
-        };
-        var realSet = methodDescriptor.set;
-        /** @this {HTMLElement} */
-        methodDescriptor.set = function(v) {
-          if (typeof v === 'string' && v.toLowerCase() === 'dialog') {
-            return this.setAttribute('method', v);
-          }
-          return realSet.call(this, v);
-        };
-        Object.defineProperty(HTMLFormElement.prototype, 'method', methodDescriptor);
-      }
-    }
-
-    /**
-     * Global 'click' handler, to capture the <input type="submit"> or <button> element which has
-     * submitted a <form method="dialog">. Needed as Safari and others don't report this inside
-     * document.activeElement.
-     */
-    document.addEventListener('click', function(ev) {
-      dialogPolyfill.formSubmitter = null;
-      dialogPolyfill.imagemapUseValue = null;
-      if (ev.defaultPrevented) { return; }  // e.g. a submit which prevents default submission
-
-      var target = /** @type {Element} */ (ev.target);
-      if ('composedPath' in ev) {
-        var path = ev.composedPath();
-        target = path.shift() || target;
-      }
-      if (!target || !isFormMethodDialog(target.form)) { return; }
-
-      var valid = (target.type === 'submit' && ['button', 'input'].indexOf(target.localName) > -1);
-      if (!valid) {
-        if (!(target.localName === 'input' && target.type === 'image')) { return; }
-        // this is a <input type="image">, which can submit forms
-        dialogPolyfill.imagemapUseValue = ev.offsetX + ',' + ev.offsetY;
-      }
-
-      var dialog = findNearestDialog(target);
-      if (!dialog) { return; }
-
-      dialogPolyfill.formSubmitter = target;
-
-    }, false);
-
-    /**
-     * Global 'submit' handler. This handles submits of `method="dialog"` which are invalid, i.e.,
-     * outside a dialog. They get prevented.
-     */
-    document.addEventListener('submit', function(ev) {
-      var form = ev.target;
-      var dialog = findNearestDialog(form);
-      if (dialog) {
-        return;  // ignore, handle there
-      }
-
-      var submitter = findFormSubmitter(ev);
-      var formmethod = submitter && submitter.getAttribute('formmethod') || form.getAttribute('method');
-      if (formmethod === 'dialog') {
-        ev.preventDefault();
-      }
-    });
-
-    /**
-     * Replace the native HTMLFormElement.submit() method, as it won't fire the
-     * submit event and give us a chance to respond.
-     */
-    var nativeFormSubmit = HTMLFormElement.prototype.submit;
-    var replacementFormSubmit = function () {
-      if (!isFormMethodDialog(this)) {
-        return nativeFormSubmit.call(this);
-      }
-      var dialog = findNearestDialog(this);
-      dialog && dialog.close();
-    };
-    HTMLFormElement.prototype.submit = replacementFormSubmit;
-  }
-
-  return dialogPolyfill;
-
-}));