diff --git a/README.md b/README.md
index 157818e..b8fe496 100644
--- a/README.md
+++ b/README.md
@@ -155,6 +155,4 @@ The script uses two heuristics to determine whether the keyboard is being used:
 or `Shift + Tab`.
 - focus moves into an element which requires keyboard interaction,
   such as a text field
-- _TODO: ideally, we also trigger keyboard modality
-  following a keyboard event which activates an element or causes a mutation;
-  this still needs to be implemented._
+- We also trigger keyboard modality following a keyboard event which activates an element or causes a mutation. The following keys that typically result in a change of context or focus are handled: `Backspace`, `Enter`, `Esc`, `Space`, `PageUp`, `PageDown`, `End`, `Home`, `ArrowLeft`, `ArrowUp`, `ArrowRight`, `ArrowDown`, or `Delete`.
diff --git a/dist/focus-ring.js b/dist/focus-ring.js
index 48fa3ab..da5dffe 100644
--- a/dist/focus-ring.js
+++ b/dist/focus-ring.js
@@ -11,7 +11,7 @@
  * @return {ClassList}
  */
 
-var index = function (el) {
+var domClasslist = function (el) {
   return new ClassList(el);
 };
 
@@ -170,11 +170,47 @@ ClassList.prototype.toggle = function (token, force) {
   return (typeof force == 'boolean' ? force : !hasToken);
 };
 
+// element-closest | CC0-1.0 | github.com/jonathantneal/closest
+
+(function (ElementProto) {
+	if (typeof ElementProto.matches !== 'function') {
+		ElementProto.matches = ElementProto.msMatchesSelector || ElementProto.mozMatchesSelector || ElementProto.webkitMatchesSelector || function matches(selector) {
+			var element = this;
+			var elements = (element.document || element.ownerDocument).querySelectorAll(selector);
+			var index = 0;
+
+			while (elements[index] && elements[index] !== element) {
+				++index;
+			}
+
+			return Boolean(elements[index]);
+		};
+	}
+
+	if (typeof ElementProto.closest !== 'function') {
+		ElementProto.closest = function closest(selector) {
+			var element = this;
+
+			while (element && element.nodeType === 1) {
+				if (element.matches(selector)) {
+					return element;
+				}
+
+				element = element.parentNode;
+			}
+
+			return null;
+		};
+	}
+})(window.Element.prototype);
+
 /**
  * https://github.com/WICG/focus-ring
  */
 function init() {
+  var hadKeyboardEvent = false;
   var elWithFocusRing;
+  var elementsWithFocusRing = document.getElementsByClassName('focus-ring');
 
   var inputTypesWhitelist = {
     'radio': true,
@@ -197,6 +233,121 @@ function init() {
     'datetime-local': true,
   };
 
+  // keys that often produce a change of context or focus
+  var navigationKeys = [
+    8 /* Backspace */,
+    9 /* Tab */,
+    13 /* Enter */,
+    27 /* Esc */,
+    32 /* Space */,
+    33 /* PageUp */,
+    34 /* PageDown */,
+    35 /* End */,
+    36 /* Home */,
+    37 /* ArrowLeft */,
+    38 /* ArrowUp */,
+    39 /* ArrowRight */,
+    40 /* ArrowDown */,
+    46/* Delete */,
+  ];
+
+  var behavior = {
+    incrementable: {
+      inputType: {
+        'checkbox': true,
+        'radio': true,
+        'range': true,
+      },
+      role: {
+        'button': true,
+        'checkbox': true,
+        'columnheading': true,
+        'gridcell': true,
+        'menuitem': true,
+        'menuitemcheckbox': true,
+        'menuitemradio': true,
+        'option': true,
+        'radio': true,
+        'row': true,
+        'rowheading': true,
+        'slider': true,
+        'tab': true,
+        'treeitem': true,
+      },
+    },
+    selectable: {
+      inputType: {
+        'checkbox': true,
+        'radio': true,
+      },
+      role: {
+        'button': true,
+        'checkbox': true,
+        'columnheading': true,
+        'gridcell': true,
+        'menuitemcheckbox': true,
+        'menuitemradio': true,
+        'option': true,
+        'radio': true,
+        'row': true,
+        'rowheading': true,
+        'treeitem': true,
+      },
+    },
+    deletable: {
+      inputType: {
+      },
+      role: {
+        'option': true,
+        'row': true,
+        'tab': true,
+        'treeitem': true,
+      },
+    },
+  };
+
+  /**
+   * Computes whether keyboard event should be treated as initiating focus navigation.
+   * @param {Event} e
+   * @return {boolean}
+   */
+  function handleEventAsNavigation(e) {
+    if (e.altKey || e.ctrlKey || e.metaKey)
+      return false;
+
+    var index = navigationKeys.indexOf(e.keyCode);
+    var tagName = e.target.tagName;
+    var inputType = tagName === 'INPUT' ? e.target.type : undefined;
+    var ariaRole = e.target.getAttribute('role');
+
+    // If key is not generally considered navigation, don't handle it as such.
+    if (index === -1)
+      return false;
+
+    // ArrowUp, ArrowDown, ArrowLeft, ArrowRight, Home/End, PageUp/PageDown
+    if (e.keyCode > 32 && e.keyCode < 41)
+      // Return true if target is an input or has a role and is whitelisted as 'incrementable'.
+      return (inputType && behavior.incrementable.inputType[inputType])
+        || (ariaRole && behavior.incrementable.role[ariaRole]);
+
+    // Enter or Space
+    if (e.keyCode == 13 || e.keyCode == 32)
+      // Return true if target is an input or has a role and is whitelisted as 'selectable'.
+      return (inputType && behavior.selectable.inputType[inputType])
+        || (ariaRole && behavior.selectable.role[ariaRole]);
+
+    // Esc key when target is a descendant of a dialog or menu.
+    if (e.keyCode == 27)
+      return event.target.closest('[role$="dialog"],[role="menu"]') !== null;
+
+    // Backspace or Delete
+    if (e.keyCode == 8 || e.keyCode == 46)
+      // Return true if target has a role and is whitelisted as 'deletable'.
+      return ariaRole && behavior.deletable.role[ariaRole];
+
+    return e.keyCode == 9;
+  }
+
   /**
    * Computes whether the given element should automatically trigger the
    * `focus-ring` class being added, i.e. whether it should always match
@@ -226,9 +377,9 @@ function init() {
    * @param {Element} el
    */
   function addFocusRingClass(el) {
-    if (index(el).contains('focus-ring'))
+    if (domClasslist(el).contains('focus-ring'))
       return;
-    index(el).add('focus-ring');
+    domClasslist(el).add('focus-ring');
     el.setAttribute('data-focus-ring-added', '');
   }
 
@@ -240,32 +391,52 @@ function init() {
   function removeFocusRingClass(el) {
     if (!el.hasAttribute('data-focus-ring-added'))
       return;
-    index(el).remove('focus-ring');
+    domClasslist(el).remove('focus-ring');
     el.removeAttribute('data-focus-ring-added');
   }
 
   /**
-   * On `keyup` add `focus-ring` class if the user pressed Tab and the event
-   * target is an element that will likely require interaction via the
-   * keyboard (e.g. a text box).
-   * The `keyup` event is used over the focus event because:
-   * 1. `focus` is a device-independent event, and `keyup` ensures the
-   *    `focus-ring` class is only added when focus originates from
-   *    keyboard navigation.
-   * 2. Unlike `focus`, keyup` will fire when the user navigates from the
-   *    browser chrome into the document. (For more, see issue #15)
+   * On `keydown`, set `hadKeyboardEvent`, add `focus-ring` class if the
+   * key was Tab or another navigation key.
    * @param {Event} e
    */
-  function onKeyUp(e) {
-    if (e.altKey || e.ctrlKey || e.metaKey)
+  function onKeyDown(e) {
+    if (!handleEventAsNavigation(e))
       return;
 
-    if (e.keyCode != 9)
+    hadKeyboardEvent = true;
+  }
+
+  /**
+   * On `mousedown`, unset `hadKeyboardEvent`, remove `focus-ring` class from elements where not
+   * originally added by the author.
+   * @param {Event} e
+   */
+  function onMouseDown(e) {
+    hadKeyboardEvent = false;
+    if (elementsWithFocusRing.length) {
+      for(var i = 0; i < elementsWithFocusRing.length; i++) {
+        if (!focusTriggersKeyboardModality(elementsWithFocusRing[i])) {
+          removeFocusRingClass(elementsWithFocusRing[i]);
+        }
+      }
+    }
+  }
+
+  /**
+   * On `focus`, add the `focus-ring` class to the target if:
+   * - the target received focus as a result of keyboard navigation
+   * - the event target is an element that will likely require interaction
+   *   via the keyboard (e.g. a text box)
+   * @param {Event} e
+   */
+  function onFocus(e) {
+    if (e.target == document)
       return;
 
-    var target = e.target;
-    if (focusTriggersKeyboardModality(target)) {
-      addFocusRingClass(target);
+    if (hadKeyboardEvent || focusTriggersKeyboardModality(e.target)) {
+      addFocusRingClass(e.target);
+      hadKeyboardEvent = false;
     }
   }
 
@@ -304,7 +475,7 @@ function init() {
     // document.activeElement === null
     if (!document.activeElement)
       return;
-    if (index(document.activeElement).contains('focus-ring')) {
+    if (domClasslist(document.activeElement).contains('focus-ring')) {
       // Keep a reference to the element to which the focus-ring class is applied
       // so the focus-ring class can be restored to it if the window regains
       // focus after being blurred.
@@ -312,12 +483,14 @@ function init() {
     }
   }
 
-  document.addEventListener('keyup', onKeyUp, true);
+  document.addEventListener('keydown', onKeyDown, true);
+  document.addEventListener('mousedown', onMouseDown, true);
+  document.addEventListener('focus', onFocus, true);
   document.addEventListener('blur', onBlur, true);
   window.addEventListener('focus', onWindowFocus, true);
   window.addEventListener('blur', onWindowBlur, true);
 
-  index(document.body).add('js-focus-ring');
+  domClasslist(document.body).add('js-focus-ring');
 }
 
 /**
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..9f25f75
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1642 @@
+{
+  "name": "wicg-focus-ring",
+  "version": "2.0.1",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "acorn": {
+      "version": "5.1.2",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/acorn/-/acorn-5.1.2.tgz",
+      "integrity": "sha1-kRy1PgNoB88Pp3jcXTcPvYZCRtc=",
+      "dev": true
+    },
+    "acorn-jsx": {
+      "version": "3.0.1",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
+      "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
+      "dev": true,
+      "requires": {
+        "acorn": "3.3.0"
+      },
+      "dependencies": {
+        "acorn": {
+          "version": "3.3.0",
+          "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/acorn/-/acorn-3.3.0.tgz",
+          "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo=",
+          "dev": true
+        }
+      }
+    },
+    "ajv": {
+      "version": "4.11.8",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/ajv/-/ajv-4.11.8.tgz",
+      "integrity": "sha1-gv+wKynmYq5TvcIK8VlHcGc5xTY=",
+      "dev": true,
+      "requires": {
+        "co": "4.6.0",
+        "json-stable-stringify": "1.0.1"
+      }
+    },
+    "ajv-keywords": {
+      "version": "1.5.1",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/ajv-keywords/-/ajv-keywords-1.5.1.tgz",
+      "integrity": "sha1-MU3QpLM2j609/NxU7eYXG4htrzw=",
+      "dev": true
+    },
+    "ansi-escapes": {
+      "version": "1.4.0",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/ansi-escapes/-/ansi-escapes-1.4.0.tgz",
+      "integrity": "sha1-06ioOzGapneTZisT52HHkRQiMG4=",
+      "dev": true
+    },
+    "ansi-regex": {
+      "version": "2.1.1",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/ansi-regex/-/ansi-regex-2.1.1.tgz",
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+      "dev": true
+    },
+    "ansi-styles": {
+      "version": "2.2.1",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/ansi-styles/-/ansi-styles-2.2.1.tgz",
+      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+      "dev": true
+    },
+    "argparse": {
+      "version": "1.0.9",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/argparse/-/argparse-1.0.9.tgz",
+      "integrity": "sha1-c9g7wmP4bpf4zE9rrhsOkKfSLIY=",
+      "dev": true,
+      "requires": {
+        "sprintf-js": "1.0.3"
+      }
+    },
+    "arr-diff": {
+      "version": "2.0.0",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/arr-diff/-/arr-diff-2.0.0.tgz",
+      "integrity": "sha1-jzuCf5Vai9ZpaX5KQlasPOrjVs8=",
+      "dev": true,
+      "requires": {
+        "arr-flatten": "1.1.0"
+      }
+    },
+    "arr-flatten": {
+      "version": "1.1.0",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/arr-flatten/-/arr-flatten-1.1.0.tgz",
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+      "dev": true
+    },
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+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/array-union/-/array-union-1.0.2.tgz",
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+      "requires": {
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+      }
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+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/array-uniq/-/array-uniq-1.0.3.tgz",
+      "integrity": "sha1-r2rId6Jcx/dOBYiUdThY39sk/bY=",
+      "dev": true
+    },
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+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/array-unique/-/array-unique-0.2.1.tgz",
+      "integrity": "sha1-odl8yvy8JiXMcPrc6zalDFiwGlM=",
+      "dev": true
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+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/arrify/-/arrify-1.0.1.tgz",
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+      "dev": true
+    },
+    "babel-code-frame": {
+      "version": "6.26.0",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
+      "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
+      "dev": true,
+      "requires": {
+        "chalk": "1.1.3",
+        "esutils": "2.0.2",
+        "js-tokens": "3.0.2"
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+      "version": "1.0.0",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/balanced-match/-/balanced-match-1.0.0.tgz",
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
+      "dev": true
+    },
+    "brace-expansion": {
+      "version": "1.1.8",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/brace-expansion/-/brace-expansion-1.1.8.tgz",
+      "integrity": "sha1-wHshHHyVLsH479Uad+8NHTmQopI=",
+      "dev": true,
+      "requires": {
+        "balanced-match": "1.0.0",
+        "concat-map": "0.0.1"
+      }
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+    "braces": {
+      "version": "1.8.5",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/braces/-/braces-1.8.5.tgz",
+      "integrity": "sha1-uneWLhLf+WnWt2cR6RS3N4V79qc=",
+      "dev": true,
+      "requires": {
+        "expand-range": "1.8.2",
+        "preserve": "0.2.0",
+        "repeat-element": "1.1.2"
+      }
+    },
+    "browser-resolve": {
+      "version": "1.11.2",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/browser-resolve/-/browser-resolve-1.11.2.tgz",
+      "integrity": "sha1-j/CbCixCFxihBRwmCzLkj0QpOM4=",
+      "dev": true,
+      "requires": {
+        "resolve": "1.1.7"
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+        "resolve": {
+          "version": "1.1.7",
+          "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/resolve/-/resolve-1.1.7.tgz",
+          "integrity": "sha1-IDEU2CrSxe2ejgQRs5ModeiJ6Xs=",
+          "dev": true
+        }
+      }
+    },
+    "builtin-modules": {
+      "version": "1.1.1",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/builtin-modules/-/builtin-modules-1.1.1.tgz",
+      "integrity": "sha1-Jw8HbFpywC9bZaR9+Uxf46J4iS8=",
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+      "version": "0.1.0",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/caller-path/-/caller-path-0.1.0.tgz",
+      "integrity": "sha1-lAhe9jWB7NPaqSREqP6U6CV3dR8=",
+      "dev": true,
+      "requires": {
+        "callsites": "0.2.0"
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+    "callsites": {
+      "version": "0.2.0",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/callsites/-/callsites-0.2.0.tgz",
+      "integrity": "sha1-r6uWJikQp/M8GaV3WCXGnzTjUMo=",
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+    },
+    "chalk": {
+      "version": "1.1.3",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/chalk/-/chalk-1.1.3.tgz",
+      "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
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+      "requires": {
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+        "escape-string-regexp": "1.0.5",
+        "has-ansi": "2.0.0",
+        "strip-ansi": "3.0.1",
+        "supports-color": "2.0.0"
+      }
+    },
+    "circular-json": {
+      "version": "0.3.3",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/circular-json/-/circular-json-0.3.3.tgz",
+      "integrity": "sha1-gVyZ6oT2gJUp0vRXkb34JxE1LWY=",
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+    "cli-cursor": {
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+      "dev": true,
+      "requires": {
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+    "cli-width": {
+      "version": "2.2.0",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/cli-width/-/cli-width-2.2.0.tgz",
+      "integrity": "sha1-/xnt6Kml5XkyQUewwR8PvLq+1jk=",
+      "dev": true
+    },
+    "co": {
+      "version": "4.6.0",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/co/-/co-4.6.0.tgz",
+      "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ=",
+      "dev": true
+    },
+    "code-point-at": {
+      "version": "1.1.0",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/code-point-at/-/code-point-at-1.1.0.tgz",
+      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
+      "dev": true
+    },
+    "concat-map": {
+      "version": "0.0.1",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/concat-map/-/concat-map-0.0.1.tgz",
+      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
+      "dev": true
+    },
+    "concat-stream": {
+      "version": "1.6.0",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/concat-stream/-/concat-stream-1.6.0.tgz",
+      "integrity": "sha1-CqxmL9Ur54lk1VMvaUeE5wEQrPc=",
+      "dev": true,
+      "requires": {
+        "inherits": "2.0.3",
+        "readable-stream": "2.3.3",
+        "typedarray": "0.0.6"
+      }
+    },
+    "core-util-is": {
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+      }
+    },
+    "util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
+      "dev": true
+    },
+    "vlq": {
+      "version": "0.2.3",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/vlq/-/vlq-0.2.3.tgz",
+      "integrity": "sha1-jz5DKM9jsVQMDWfhsneDhviXWyY=",
+      "dev": true
+    },
+    "wordwrap": {
+      "version": "1.0.0",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/wordwrap/-/wordwrap-1.0.0.tgz",
+      "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
+      "dev": true
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    },
+    "write": {
+      "version": "0.2.1",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/write/-/write-0.2.1.tgz",
+      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
+      "dev": true,
+      "requires": {
+        "mkdirp": "0.5.1"
+      }
+    },
+    "xtend": {
+      "version": "4.0.1",
+      "resolved": "https://artifactory.corp.adobe.com:443/artifactory/api/npm/npm-dcloud/xtend/-/xtend-4.0.1.tgz",
+      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
+      "dev": true
+    }
+  }
+}
diff --git a/package.json b/package.json
index ca49d8f..4cebded 100644
--- a/package.json
+++ b/package.json
@@ -29,6 +29,7 @@
     "rollup-watch": "^3.2.2"
   },
   "dependencies": {
-    "dom-classlist": "^1.0.1"
+    "dom-classlist": "^1.0.1",
+    "element-closest": "^2.0.2"
   }
 }
diff --git a/src/focus-ring.js b/src/focus-ring.js
index 4ccecd7..1c0d534 100644
--- a/src/focus-ring.js
+++ b/src/focus-ring.js
@@ -1,10 +1,13 @@
 import classList from 'dom-classlist';
+import 'element-closest';
 
 /**
  * https://github.com/WICG/focus-ring
  */
 function init() {
+  var hadKeyboardEvent = false;
   var elWithFocusRing;
+  var elementsWithFocusRing = document.getElementsByClassName('focus-ring');
 
   var inputTypesWhitelist = {
     'radio': true,
@@ -27,6 +30,121 @@ function init() {
     'datetime-local': true,
   };
 
+  // keys that often produce a change of context or focus
+  var navigationKeys = [
+    8 /* Backspace */,
+    9 /* Tab */,
+    13 /* Enter */,
+    27 /* Esc */,
+    32 /* Space */,
+    33 /* PageUp */,
+    34 /* PageDown */,
+    35 /* End */,
+    36 /* Home */,
+    37 /* ArrowLeft */,
+    38 /* ArrowUp */,
+    39 /* ArrowRight */,
+    40 /* ArrowDown */,
+    46/* Delete */,
+  ];
+
+  var behavior = {
+    incrementable: {
+      inputType: {
+        'checkbox': true,
+        'radio': true,
+        'range': true,
+      },
+      role: {
+        'button': true,
+        'checkbox': true,
+        'columnheading': true,
+        'gridcell': true,
+        'menuitem': true,
+        'menuitemcheckbox': true,
+        'menuitemradio': true,
+        'option': true,
+        'radio': true,
+        'row': true,
+        'rowheading': true,
+        'slider': true,
+        'tab': true,
+        'treeitem': true,
+      },
+    },
+    selectable: {
+      inputType: {
+        'checkbox': true,
+        'radio': true,
+      },
+      role: {
+        'button': true,
+        'checkbox': true,
+        'columnheading': true,
+        'gridcell': true,
+        'menuitemcheckbox': true,
+        'menuitemradio': true,
+        'option': true,
+        'radio': true,
+        'row': true,
+        'rowheading': true,
+        'treeitem': true,
+      },
+    },
+    deletable: {
+      inputType: {
+      },
+      role: {
+        'option': true,
+        'row': true,
+        'tab': true,
+        'treeitem': true,
+      },
+    },
+  };
+
+  /**
+   * Computes whether keyboard event should be treated as initiating focus navigation.
+   * @param {Event} e
+   * @return {boolean}
+   */
+  function handleEventAsNavigation(e) {
+    if (e.altKey || e.ctrlKey || e.metaKey)
+      return false;
+
+    var index = navigationKeys.indexOf(e.keyCode);
+    var tagName = e.target.tagName;
+    var inputType = tagName === 'INPUT' ? e.target.type : undefined;
+    var ariaRole = e.target.getAttribute('role');
+
+    // If key is not generally considered navigation, don't handle it as such.
+    if (index === -1)
+      return false;
+
+    // ArrowUp, ArrowDown, ArrowLeft, ArrowRight, Home/End, PageUp/PageDown
+    if (e.keyCode > 32 && e.keyCode < 41)
+      // Return true if target is an input or has a role and is whitelisted as 'incrementable'.
+      return (inputType && behavior.incrementable.inputType[inputType])
+        || (ariaRole && behavior.incrementable.role[ariaRole]);
+
+    // Enter or Space
+    if (e.keyCode == 13 || e.keyCode == 32)
+      // Return true if target is an input or has a role and is whitelisted as 'selectable'.
+      return (inputType && behavior.selectable.inputType[inputType])
+        || (ariaRole && behavior.selectable.role[ariaRole]);
+
+    // Esc key when target is a descendant of a dialog or menu.
+    if (e.keyCode == 27)
+      return event.target.closest('[role$="dialog"],[role="menu"]') !== null;
+
+    // Backspace or Delete
+    if (e.keyCode == 8 || e.keyCode == 46)
+      // Return true if target has a role and is whitelisted as 'deletable'.
+      return ariaRole && behavior.deletable.role[ariaRole];
+
+    return e.keyCode == 9;
+  }
+
   /**
    * Computes whether the given element should automatically trigger the
    * `focus-ring` class being added, i.e. whether it should always match
@@ -75,27 +193,47 @@ function init() {
   }
 
   /**
-   * On `keyup` add `focus-ring` class if the user pressed Tab and the event
-   * target is an element that will likely require interaction via the
-   * keyboard (e.g. a text box).
-   * The `keyup` event is used over the focus event because:
-   * 1. `focus` is a device-independent event, and `keyup` ensures the
-   *    `focus-ring` class is only added when focus originates from
-   *    keyboard navigation.
-   * 2. Unlike `focus`, keyup` will fire when the user navigates from the
-   *    browser chrome into the document. (For more, see issue #15)
+   * On `keydown`, set `hadKeyboardEvent`, add `focus-ring` class if the
+   * key was Tab or another navigation key.
    * @param {Event} e
    */
-  function onKeyUp(e) {
-    if (e.altKey || e.ctrlKey || e.metaKey)
+  function onKeyDown(e) {
+    if (!handleEventAsNavigation(e))
       return;
 
-    if (e.keyCode != 9)
+    hadKeyboardEvent = true;
+  }
+
+  /**
+   * On `mousedown`, unset `hadKeyboardEvent`, remove `focus-ring` class from elements where not
+   * originally added by the author.
+   * @param {Event} e
+   */
+  function onMouseDown(e) {
+    hadKeyboardEvent = false;
+    if (elementsWithFocusRing.length) {
+      for(var i = 0; i < elementsWithFocusRing.length; i++) {
+        if (!focusTriggersKeyboardModality(elementsWithFocusRing[i])) {
+          removeFocusRingClass(elementsWithFocusRing[i]);
+        }
+      }
+    }
+  }
+
+  /**
+   * On `focus`, add the `focus-ring` class to the target if:
+   * - the target received focus as a result of keyboard navigation
+   * - the event target is an element that will likely require interaction
+   *   via the keyboard (e.g. a text box)
+   * @param {Event} e
+   */
+  function onFocus(e) {
+    if (e.target == document)
       return;
 
-    var target = e.target;
-    if (focusTriggersKeyboardModality(target)) {
-      addFocusRingClass(target);
+    if (hadKeyboardEvent || focusTriggersKeyboardModality(e.target)) {
+      addFocusRingClass(e.target);
+      hadKeyboardEvent = false;
     }
   }
 
@@ -142,7 +280,9 @@ function init() {
     }
   }
 
-  document.addEventListener('keyup', onKeyUp, true);
+  document.addEventListener('keydown', onKeyDown, true);
+  document.addEventListener('mousedown', onMouseDown, true);
+  document.addEventListener('focus', onFocus, true);
   document.addEventListener('blur', onBlur, true);
   window.addEventListener('focus', onWindowFocus, true);
   window.addEventListener('blur', onWindowBlur, true);