src/third_party/closure_library/closure/goog/editor/browserfeature.js - incubator-pagespeed-debian - Git at Google

 // Copyright 2005 The Closure Library Authors. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //      http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS-IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 /**
  * @fileoverview Trogedit constants for browser features and quirks that should
  * be used by the rich text editor.
  */

 goog.provide('goog.editor.BrowserFeature');

 goog.require('goog.editor.defines');
 goog.require('goog.userAgent');
 goog.require('goog.userAgent.product');
 goog.require('goog.userAgent.product.isVersion');


 /**
  * Maps browser quirks to boolean values, detailing what the current
  * browser supports.
  * @const
  */
 goog.editor.BrowserFeature = {
   // Whether this browser uses the IE TextRange object.
   HAS_IE_RANGES: goog.userAgent.IE && !goog.userAgent.isDocumentModeOrHigher(9),

   // Whether this browser uses the W3C standard Range object.
   // Assumes IE higher versions will be compliance with W3C standard.
   HAS_W3C_RANGES: goog.userAgent.GECKO || goog.userAgent.WEBKIT ||
       goog.userAgent.OPERA ||
       (goog.userAgent.IE && goog.userAgent.isDocumentModeOrHigher(9)),

   // Has the contentEditable attribute, which makes nodes editable.
   //
   // NOTE(nicksantos): FF3 has contentEditable, but there are 3 major reasons
   // why we don't use it:
   // 1) In FF3, we listen for key events on the document, and we'd have to
   //    filter them properly. See TR_Browser.USE_DOCUMENT_FOR_KEY_EVENTS.
   // 2) In FF3, we listen for focus/blur events on the document, which
   //    simply doesn't make sense in contentEditable. focus/blur
   //    on contentEditable elements still has some quirks, which we're
   //    talking to Firefox-team about.
   // 3) We currently use Mutation events in FF3 to detect changes,
   //    and these are dispatched on the document only.
   // If we ever hope to support FF3/contentEditable, all 3 of these issues
   // will need answers. Most just involve refactoring at our end.
   HAS_CONTENT_EDITABLE: goog.userAgent.IE || goog.userAgent.WEBKIT ||
       goog.userAgent.OPERA ||
       (goog.editor.defines.USE_CONTENTEDITABLE_IN_FIREFOX_3 &&
        goog.userAgent.GECKO && goog.userAgent.isVersionOrHigher('1.9')),

   // Whether to use mutation event types to detect changes
   // in the field contents.
   USE_MUTATION_EVENTS: goog.userAgent.GECKO,

   // Whether the browser has a functional DOMSubtreeModified event.
   // TODO(user): Enable for all FF3 once we're confident this event fires
   // reliably. Currently it's only enabled if using contentEditable in FF as
   // we have no other choice in that case but to use this event.
   HAS_DOM_SUBTREE_MODIFIED_EVENT: goog.userAgent.WEBKIT ||
       (goog.editor.defines.USE_CONTENTEDITABLE_IN_FIREFOX_3 &&
        goog.userAgent.GECKO && goog.userAgent.isVersionOrHigher('1.9')),

   // Whether nodes can be copied from one document to another
   HAS_DOCUMENT_INDEPENDENT_NODES: goog.userAgent.GECKO,

   // Whether the cursor goes before or inside the first block element on
   // focus, e.g., <body><p>foo</p></body>. FF will put the cursor before the
   // paragraph on focus, which is wrong.
   PUTS_CURSOR_BEFORE_FIRST_BLOCK_ELEMENT_ON_FOCUS: goog.userAgent.GECKO,

   // Whether the selection of one frame is cleared when another frame
   // is focused.
   CLEARS_SELECTION_WHEN_FOCUS_LEAVES:
       goog.userAgent.IE || goog.userAgent.WEBKIT || goog.userAgent.OPERA,

   // Whether "unselectable" is supported as an element style.
   HAS_UNSELECTABLE_STYLE: goog.userAgent.GECKO || goog.userAgent.WEBKIT,

   // Whether this browser's "FormatBlock" command does not suck.
   FORMAT_BLOCK_WORKS_FOR_BLOCKQUOTES: goog.userAgent.GECKO ||
       goog.userAgent.WEBKIT || goog.userAgent.OPERA,

   // Whether this browser's "FormatBlock" command may create multiple
   // blockquotes.
   CREATES_MULTIPLE_BLOCKQUOTES:
       (goog.userAgent.WEBKIT &&
        !goog.userAgent.isVersionOrHigher('534.16')) ||
       goog.userAgent.OPERA,

   // Whether this browser's "FormatBlock" command will wrap blockquotes
   // inside of divs, instead of replacing divs with blockquotes.
   WRAPS_BLOCKQUOTE_IN_DIVS: goog.userAgent.OPERA,

   // Whether the readystatechange event is more reliable than load.
   PREFERS_READY_STATE_CHANGE_EVENT: goog.userAgent.IE,

   // Whether hitting the tab key will fire a keypress event.
   // see http://www.quirksmode.org/js/keys.html
   TAB_FIRES_KEYPRESS: !goog.userAgent.IE,

   // Has a standards mode quirk where width=100% doesn't do the right thing,
   // but width=99% does.
   // TODO(user|user): This should be fixable by less hacky means
   NEEDS_99_WIDTH_IN_STANDARDS_MODE: goog.userAgent.IE,

   // Whether keyboard events only reliably fire on the document.
   // On Gecko without contentEditable, keyboard events only fire reliably on the
   // document element. With contentEditable, the field itself is focusable,
   // which means that it will fire key events. This does not apply if
   // application is using ContentEditableField or otherwise overriding Field
   // not to use an iframe.
   USE_DOCUMENT_FOR_KEY_EVENTS: goog.userAgent.GECKO &&
       !goog.editor.defines.USE_CONTENTEDITABLE_IN_FIREFOX_3,

   // Whether this browser shows non-standard attributes in innerHTML.
   SHOWS_CUSTOM_ATTRS_IN_INNER_HTML: goog.userAgent.IE,

   // Whether this browser shrinks empty nodes away to nothing.
   // (If so, we need to insert some space characters into nodes that
   //  shouldn't be collapsed)
   COLLAPSES_EMPTY_NODES:
       goog.userAgent.GECKO || goog.userAgent.WEBKIT || goog.userAgent.OPERA,

   // Whether we must convert <strong> and <em> tags to <b>, <i>.
   CONVERT_TO_B_AND_I_TAGS: goog.userAgent.GECKO || goog.userAgent.OPERA,

   // Whether this browser likes to tab through images in contentEditable mode,
   // and we like to disable this feature.
   TABS_THROUGH_IMAGES: goog.userAgent.IE,

   // Whether this browser unescapes urls when you extract it from the href tag.
   UNESCAPES_URLS_WITHOUT_ASKING: goog.userAgent.IE &&
       !goog.userAgent.isVersionOrHigher('7.0'),

   // Whether this browser supports execCommand("styleWithCSS") to toggle between
   // inserting html tags or inline styling for things like bold, italic, etc.
   HAS_STYLE_WITH_CSS:
       goog.userAgent.GECKO && goog.userAgent.isVersionOrHigher('1.8') ||
       goog.userAgent.WEBKIT || goog.userAgent.OPERA,

   // Whether clicking on an editable link will take you to that site.
   FOLLOWS_EDITABLE_LINKS: goog.userAgent.WEBKIT ||
       goog.userAgent.IE && goog.userAgent.isVersionOrHigher('9'),

   // Whether this browser has document.activeElement available.
   HAS_ACTIVE_ELEMENT:
       goog.userAgent.IE || goog.userAgent.OPERA ||
       goog.userAgent.GECKO && goog.userAgent.isVersionOrHigher('1.9'),

   // Whether this browser supports the setCapture method on DOM elements.
   HAS_SET_CAPTURE: goog.userAgent.IE,

   // Whether this browser can't set background color when the selection
   // is collapsed.
   EATS_EMPTY_BACKGROUND_COLOR: goog.userAgent.GECKO ||
       goog.userAgent.WEBKIT && !goog.userAgent.isVersionOrHigher('527'),

   // Whether this browser supports the "focusin" or "DOMFocusIn" event
   // consistently.
   // NOTE(nicksantos): FF supports DOMFocusIn, but doesn't seem to do so
   // consistently.
   SUPPORTS_FOCUSIN: goog.userAgent.IE || goog.userAgent.OPERA,

   // Whether clicking on an image will cause the selection to move to the image.
   // Note: Gecko moves the selection, but it won't always go to the image.
   // For example, if the image is wrapped in a div, and you click on the img,
   // anchorNode = focusNode = div, anchorOffset = 0, focusOffset = 1, so this
   // is another way of "selecting" the image, but there are too many special
   // cases like this so we will do the work manually.
   SELECTS_IMAGES_ON_CLICK: goog.userAgent.IE || goog.userAgent.OPERA,

   // Whether this browser moves <style> tags into new <head> elements.
   MOVES_STYLE_TO_HEAD: goog.userAgent.WEBKIT,

   // Whether this browser collapses the selection in a contenteditable when the
   // mouse is pressed in a non-editable portion of the same frame, even if
   // Event.preventDefault is called. This field is deprecated and unused -- only
   // old versions of Opera have this bug.
   COLLAPSES_SELECTION_ONMOUSEDOWN: false,

   // Whether the user can actually create a selection in this browser with the
   // caret in the MIDDLE of the selection by double-clicking.
   CARET_INSIDE_SELECTION: goog.userAgent.OPERA,

   // Whether the browser focuses <body contenteditable> automatically when
   // the user clicks on <html>. This field is deprecated and unused -- only old
   // versions of Opera don't have this behavior.
   FOCUSES_EDITABLE_BODY_ON_HTML_CLICK: true,

   // Whether to use keydown for key listening (uses keypress otherwise). Taken
   // from goog.events.KeyHandler.
   USES_KEYDOWN: goog.userAgent.IE ||
       goog.userAgent.WEBKIT && goog.userAgent.isVersionOrHigher('525'),

   // Whether this browser converts spaces to non-breaking spaces when calling
   // execCommand's RemoveFormat.
   // See: https://bugs.webkit.org/show_bug.cgi?id=14062
   ADDS_NBSPS_IN_REMOVE_FORMAT:
       goog.userAgent.WEBKIT && !goog.userAgent.isVersionOrHigher('531'),

   // Whether the browser will get stuck inside a link.  That is, if your cursor
   // is after a link and you type, does your text go inside the link tag.
   // Bug: http://bugs.webkit.org/show_bug.cgi?id=17697
   GETS_STUCK_IN_LINKS:
       goog.userAgent.WEBKIT && !goog.userAgent.isVersionOrHigher('528'),

   // Whether the browser corrupts empty text nodes in Node#normalize,
   // removing them from the Document instead of merging them.
   NORMALIZE_CORRUPTS_EMPTY_TEXT_NODES: goog.userAgent.GECKO &&
       goog.userAgent.isVersionOrHigher('1.9') || goog.userAgent.IE ||
       goog.userAgent.OPERA ||
       goog.userAgent.WEBKIT && goog.userAgent.isVersionOrHigher('531'),

   // Whether the browser corrupts all text nodes in Node#normalize,
   // removing them from the Document instead of merging them.
   NORMALIZE_CORRUPTS_ALL_TEXT_NODES: goog.userAgent.IE,

   // Browsers where executing subscript then superscript (or vv) will cause both
   // to be applied in a nested fashion instead of the first being overwritten by
   // the second.
   NESTS_SUBSCRIPT_SUPERSCRIPT: goog.userAgent.IE || goog.userAgent.GECKO ||
       goog.userAgent.OPERA,

   // Whether this browser can place a cursor in an empty element natively.
   CAN_SELECT_EMPTY_ELEMENT: !goog.userAgent.IE && !goog.userAgent.WEBKIT,

   FORGETS_FORMATTING_WHEN_LISTIFYING: goog.userAgent.GECKO ||
       goog.userAgent.WEBKIT && !goog.userAgent.isVersionOrHigher('526'),

   LEAVES_P_WHEN_REMOVING_LISTS: goog.userAgent.IE || goog.userAgent.OPERA,

   CAN_LISTIFY_BR: !goog.userAgent.IE && !goog.userAgent.OPERA,

   // See bug 1286408. When somewhere inside your selection there is an element
   // with a style attribute that sets the font size, if you change the font
   // size, the browser creates a font tag, but the font size in the style attr
   // overrides the font tag. Only webkit removes that font size from the style
   // attr.
   DOESNT_OVERRIDE_FONT_SIZE_IN_STYLE_ATTR: !goog.userAgent.WEBKIT,

   // Implements this spec about dragging files from the filesystem to the
   // browser: http://www.whatwg/org/specs/web-apps/current-work/#dnd
   SUPPORTS_HTML5_FILE_DRAGGING: (goog.userAgent.product.CHROME &&
                                  goog.userAgent.product.isVersion('4')) ||
       (goog.userAgent.product.SAFARI &&
        goog.userAgent.isVersionOrHigher('533')) ||
       (goog.userAgent.GECKO &&
        goog.userAgent.isVersionOrHigher('2.0')) ||
       (goog.userAgent.IE &&
        goog.userAgent.isVersionOrHigher('10')),

   // Version of Opera that supports the opera-defaultBlock execCommand to change
   // the default block inserted when [return] is pressed. Note that this only is
   // used if the caret is not already in a block that can be repeated.
   // TODO(user): Link to public documentation of this feature if Opera puts
   // something up about it.
   SUPPORTS_OPERA_DEFAULTBLOCK_COMMAND:
       goog.userAgent.OPERA && goog.userAgent.isVersionOrHigher('11.10'),

   SUPPORTS_FILE_PASTING: goog.userAgent.product.CHROME &&
       goog.userAgent.product.isVersion('12')
 };
	// Copyright 2005 The Closure Library Authors. All Rights Reserved.
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS-IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	/**
	* @fileoverview Trogedit constants for browser features and quirks that should
	* be used by the rich text editor.
	*/

	goog.provide('goog.editor.BrowserFeature');

	goog.require('goog.editor.defines');
	goog.require('goog.userAgent');
	goog.require('goog.userAgent.product');
	goog.require('goog.userAgent.product.isVersion');


	/**
	* Maps browser quirks to boolean values, detailing what the current
	* browser supports.
	* @const
	*/
	goog.editor.BrowserFeature = {
	// Whether this browser uses the IE TextRange object.
	HAS_IE_RANGES: goog.userAgent.IE && !goog.userAgent.isDocumentModeOrHigher(9),

	// Whether this browser uses the W3C standard Range object.
	// Assumes IE higher versions will be compliance with W3C standard.
	HAS_W3C_RANGES: goog.userAgent.GECKO \|\| goog.userAgent.WEBKIT \|\|
	goog.userAgent.OPERA \|\|
	(goog.userAgent.IE && goog.userAgent.isDocumentModeOrHigher(9)),

	// Has the contentEditable attribute, which makes nodes editable.
	//
	// NOTE(nicksantos): FF3 has contentEditable, but there are 3 major reasons
	// why we don't use it:
	// 1) In FF3, we listen for key events on the document, and we'd have to
	// filter them properly. See TR_Browser.USE_DOCUMENT_FOR_KEY_EVENTS.
	// 2) In FF3, we listen for focus/blur events on the document, which
	// simply doesn't make sense in contentEditable. focus/blur
	// on contentEditable elements still has some quirks, which we're
	// talking to Firefox-team about.
	// 3) We currently use Mutation events in FF3 to detect changes,
	// and these are dispatched on the document only.
	// If we ever hope to support FF3/contentEditable, all 3 of these issues
	// will need answers. Most just involve refactoring at our end.
	HAS_CONTENT_EDITABLE: goog.userAgent.IE \|\| goog.userAgent.WEBKIT \|\|
	goog.userAgent.OPERA \|\|
	(goog.editor.defines.USE_CONTENTEDITABLE_IN_FIREFOX_3 &&
	goog.userAgent.GECKO && goog.userAgent.isVersionOrHigher('1.9')),

	// Whether to use mutation event types to detect changes
	// in the field contents.
	USE_MUTATION_EVENTS: goog.userAgent.GECKO,

	// Whether the browser has a functional DOMSubtreeModified event.
	// TODO(user): Enable for all FF3 once we're confident this event fires
	// reliably. Currently it's only enabled if using contentEditable in FF as
	// we have no other choice in that case but to use this event.
	HAS_DOM_SUBTREE_MODIFIED_EVENT: goog.userAgent.WEBKIT \|\|
	(goog.editor.defines.USE_CONTENTEDITABLE_IN_FIREFOX_3 &&
	goog.userAgent.GECKO && goog.userAgent.isVersionOrHigher('1.9')),

	// Whether nodes can be copied from one document to another
	HAS_DOCUMENT_INDEPENDENT_NODES: goog.userAgent.GECKO,

	// Whether the cursor goes before or inside the first block element on
	// focus, e.g., <body><p>foo</p></body>. FF will put the cursor before the
	// paragraph on focus, which is wrong.
	PUTS_CURSOR_BEFORE_FIRST_BLOCK_ELEMENT_ON_FOCUS: goog.userAgent.GECKO,

	// Whether the selection of one frame is cleared when another frame
	// is focused.
	CLEARS_SELECTION_WHEN_FOCUS_LEAVES:
	goog.userAgent.IE \|\| goog.userAgent.WEBKIT \|\| goog.userAgent.OPERA,

	// Whether "unselectable" is supported as an element style.
	HAS_UNSELECTABLE_STYLE: goog.userAgent.GECKO \|\| goog.userAgent.WEBKIT,

	// Whether this browser's "FormatBlock" command does not suck.
	FORMAT_BLOCK_WORKS_FOR_BLOCKQUOTES: goog.userAgent.GECKO \|\|
	goog.userAgent.WEBKIT \|\| goog.userAgent.OPERA,

	// Whether this browser's "FormatBlock" command may create multiple
	// blockquotes.
	CREATES_MULTIPLE_BLOCKQUOTES:
	(goog.userAgent.WEBKIT &&
	!goog.userAgent.isVersionOrHigher('534.16')) \|\|
	goog.userAgent.OPERA,

	// Whether this browser's "FormatBlock" command will wrap blockquotes
	// inside of divs, instead of replacing divs with blockquotes.
	WRAPS_BLOCKQUOTE_IN_DIVS: goog.userAgent.OPERA,

	// Whether the readystatechange event is more reliable than load.
	PREFERS_READY_STATE_CHANGE_EVENT: goog.userAgent.IE,

	// Whether hitting the tab key will fire a keypress event.
	// see http://www.quirksmode.org/js/keys.html
	TAB_FIRES_KEYPRESS: !goog.userAgent.IE,

	// Has a standards mode quirk where width=100% doesn't do the right thing,
	// but width=99% does.
	// TODO(user\|user): This should be fixable by less hacky means
	NEEDS_99_WIDTH_IN_STANDARDS_MODE: goog.userAgent.IE,

	// Whether keyboard events only reliably fire on the document.
	// On Gecko without contentEditable, keyboard events only fire reliably on the
	// document element. With contentEditable, the field itself is focusable,
	// which means that it will fire key events. This does not apply if
	// application is using ContentEditableField or otherwise overriding Field
	// not to use an iframe.
	USE_DOCUMENT_FOR_KEY_EVENTS: goog.userAgent.GECKO &&
	!goog.editor.defines.USE_CONTENTEDITABLE_IN_FIREFOX_3,

	// Whether this browser shows non-standard attributes in innerHTML.
	SHOWS_CUSTOM_ATTRS_IN_INNER_HTML: goog.userAgent.IE,

	// Whether this browser shrinks empty nodes away to nothing.
	// (If so, we need to insert some space characters into nodes that
	// shouldn't be collapsed)
	COLLAPSES_EMPTY_NODES:
	goog.userAgent.GECKO \|\| goog.userAgent.WEBKIT \|\| goog.userAgent.OPERA,

	// Whether we must convert <strong> and <em> tags to <b>, <i>.
	CONVERT_TO_B_AND_I_TAGS: goog.userAgent.GECKO \|\| goog.userAgent.OPERA,

	// Whether this browser likes to tab through images in contentEditable mode,
	// and we like to disable this feature.
	TABS_THROUGH_IMAGES: goog.userAgent.IE,

	// Whether this browser unescapes urls when you extract it from the href tag.
	UNESCAPES_URLS_WITHOUT_ASKING: goog.userAgent.IE &&
	!goog.userAgent.isVersionOrHigher('7.0'),

	// Whether this browser supports execCommand("styleWithCSS") to toggle between
	// inserting html tags or inline styling for things like bold, italic, etc.
	HAS_STYLE_WITH_CSS:
	goog.userAgent.GECKO && goog.userAgent.isVersionOrHigher('1.8') \|\|
	goog.userAgent.WEBKIT \|\| goog.userAgent.OPERA,

	// Whether clicking on an editable link will take you to that site.
	FOLLOWS_EDITABLE_LINKS: goog.userAgent.WEBKIT \|\|
	goog.userAgent.IE && goog.userAgent.isVersionOrHigher('9'),

	// Whether this browser has document.activeElement available.
	HAS_ACTIVE_ELEMENT:
	goog.userAgent.IE \|\| goog.userAgent.OPERA \|\|
	goog.userAgent.GECKO && goog.userAgent.isVersionOrHigher('1.9'),

	// Whether this browser supports the setCapture method on DOM elements.
	HAS_SET_CAPTURE: goog.userAgent.IE,

	// Whether this browser can't set background color when the selection
	// is collapsed.
	EATS_EMPTY_BACKGROUND_COLOR: goog.userAgent.GECKO \|\|
	goog.userAgent.WEBKIT && !goog.userAgent.isVersionOrHigher('527'),

	// Whether this browser supports the "focusin" or "DOMFocusIn" event
	// consistently.
	// NOTE(nicksantos): FF supports DOMFocusIn, but doesn't seem to do so
	// consistently.
	SUPPORTS_FOCUSIN: goog.userAgent.IE \|\| goog.userAgent.OPERA,

	// Whether clicking on an image will cause the selection to move to the image.
	// Note: Gecko moves the selection, but it won't always go to the image.
	// For example, if the image is wrapped in a div, and you click on the img,
	// anchorNode = focusNode = div, anchorOffset = 0, focusOffset = 1, so this
	// is another way of "selecting" the image, but there are too many special
	// cases like this so we will do the work manually.
	SELECTS_IMAGES_ON_CLICK: goog.userAgent.IE \|\| goog.userAgent.OPERA,

	// Whether this browser moves <style> tags into new <head> elements.
	MOVES_STYLE_TO_HEAD: goog.userAgent.WEBKIT,

	// Whether this browser collapses the selection in a contenteditable when the
	// mouse is pressed in a non-editable portion of the same frame, even if
	// Event.preventDefault is called. This field is deprecated and unused -- only
	// old versions of Opera have this bug.
	COLLAPSES_SELECTION_ONMOUSEDOWN: false,

	// Whether the user can actually create a selection in this browser with the
	// caret in the MIDDLE of the selection by double-clicking.
	CARET_INSIDE_SELECTION: goog.userAgent.OPERA,

	// Whether the browser focuses <body contenteditable> automatically when
	// the user clicks on <html>. This field is deprecated and unused -- only old
	// versions of Opera don't have this behavior.
	FOCUSES_EDITABLE_BODY_ON_HTML_CLICK: true,

	// Whether to use keydown for key listening (uses keypress otherwise). Taken
	// from goog.events.KeyHandler.
	USES_KEYDOWN: goog.userAgent.IE \|\|
	goog.userAgent.WEBKIT && goog.userAgent.isVersionOrHigher('525'),

	// Whether this browser converts spaces to non-breaking spaces when calling
	// execCommand's RemoveFormat.
	// See: https://bugs.webkit.org/show_bug.cgi?id=14062
	ADDS_NBSPS_IN_REMOVE_FORMAT:
	goog.userAgent.WEBKIT && !goog.userAgent.isVersionOrHigher('531'),

	// Whether the browser will get stuck inside a link. That is, if your cursor
	// is after a link and you type, does your text go inside the link tag.
	// Bug: http://bugs.webkit.org/show_bug.cgi?id=17697
	GETS_STUCK_IN_LINKS:
	goog.userAgent.WEBKIT && !goog.userAgent.isVersionOrHigher('528'),

	// Whether the browser corrupts empty text nodes in Node#normalize,
	// removing them from the Document instead of merging them.
	NORMALIZE_CORRUPTS_EMPTY_TEXT_NODES: goog.userAgent.GECKO &&
	goog.userAgent.isVersionOrHigher('1.9') \|\| goog.userAgent.IE \|\|
	goog.userAgent.OPERA \|\|
	goog.userAgent.WEBKIT && goog.userAgent.isVersionOrHigher('531'),

	// Whether the browser corrupts all text nodes in Node#normalize,
	// removing them from the Document instead of merging them.
	NORMALIZE_CORRUPTS_ALL_TEXT_NODES: goog.userAgent.IE,

	// Browsers where executing subscript then superscript (or vv) will cause both
	// to be applied in a nested fashion instead of the first being overwritten by
	// the second.
	NESTS_SUBSCRIPT_SUPERSCRIPT: goog.userAgent.IE \|\| goog.userAgent.GECKO \|\|
	goog.userAgent.OPERA,

	// Whether this browser can place a cursor in an empty element natively.
	CAN_SELECT_EMPTY_ELEMENT: !goog.userAgent.IE && !goog.userAgent.WEBKIT,

	FORGETS_FORMATTING_WHEN_LISTIFYING: goog.userAgent.GECKO \|\|
	goog.userAgent.WEBKIT && !goog.userAgent.isVersionOrHigher('526'),

	LEAVES_P_WHEN_REMOVING_LISTS: goog.userAgent.IE \|\| goog.userAgent.OPERA,

	CAN_LISTIFY_BR: !goog.userAgent.IE && !goog.userAgent.OPERA,

	// See bug 1286408. When somewhere inside your selection there is an element
	// with a style attribute that sets the font size, if you change the font
	// size, the browser creates a font tag, but the font size in the style attr
	// overrides the font tag. Only webkit removes that font size from the style
	// attr.
	DOESNT_OVERRIDE_FONT_SIZE_IN_STYLE_ATTR: !goog.userAgent.WEBKIT,

	// Implements this spec about dragging files from the filesystem to the
	// browser: http://www.whatwg/org/specs/web-apps/current-work/#dnd
	SUPPORTS_HTML5_FILE_DRAGGING: (goog.userAgent.product.CHROME &&
	goog.userAgent.product.isVersion('4')) \|\|
	(goog.userAgent.product.SAFARI &&
	goog.userAgent.isVersionOrHigher('533')) \|\|
	(goog.userAgent.GECKO &&
	goog.userAgent.isVersionOrHigher('2.0')) \|\|
	(goog.userAgent.IE &&
	goog.userAgent.isVersionOrHigher('10')),

	// Version of Opera that supports the opera-defaultBlock execCommand to change
	// the default block inserted when [return] is pressed. Note that this only is
	// used if the caret is not already in a block that can be repeated.
	// TODO(user): Link to public documentation of this feature if Opera puts
	// something up about it.
	SUPPORTS_OPERA_DEFAULTBLOCK_COMMAND:
	goog.userAgent.OPERA && goog.userAgent.isVersionOrHigher('11.10'),

	SUPPORTS_FILE_PASTING: goog.userAgent.product.CHROME &&
	goog.userAgent.product.isVersion('12')
	};