Package org.htmlunit

Enum Class BrowserVersionFeatures

java.lang.Object
java.lang.Enum<BrowserVersionFeatures>
org.htmlunit.BrowserVersionFeatures
All Implemented Interfaces:
Serializable, Comparable<BrowserVersionFeatures>, Constable
public enum BrowserVersionFeatures extends Enum<BrowserVersionFeatures>
Constants of various features of each BrowserVersion.

  • Enum Constant Details

    • ANCHOR_SEND_PING_REQUEST

      public static final BrowserVersionFeatures ANCHOR_SEND_PING_REQUEST
      Ignore target when href is a javascript snippet.

    • CSS_BACKGROUND_INITIAL

      public static final BrowserVersionFeatures CSS_BACKGROUND_INITIAL
      Background image is 'initial'.

    • CSS_BACKGROUND_RGBA

      public static final BrowserVersionFeatures CSS_BACKGROUND_RGBA
      Background image is 'rgba(0, 0, 0, 0)'.

    • CSS_CSSTEXT_FF_STYLE

      public static final BrowserVersionFeatures CSS_CSSTEXT_FF_STYLE
      CSSFontFaceRule.cssText uses one more blank.

    • CSS_DISPLAY_BLOCK

      public static final BrowserVersionFeatures CSS_DISPLAY_BLOCK
      Is display style 'block'.

    • CSS_NOSCRIPT_DISPLAY_INLINE

      public static final BrowserVersionFeatures CSS_NOSCRIPT_DISPLAY_INLINE
      The default value of the display property for the 'noscript' tag is 'inline' instead of the default one.

    • CSS_RP_DISPLAY_NONE

      public static final BrowserVersionFeatures CSS_RP_DISPLAY_NONE
      The default value of the display property for the 'rp' tag is 'none'.

    • CSS_RT_DISPLAY_RUBY_TEXT_ALWAYS

      public static final BrowserVersionFeatures CSS_RT_DISPLAY_RUBY_TEXT_ALWAYS
      The default value of the display property for the 'rt' tag is always 'ruby-text'.

    • EVENT_CONTEXT_MENU_HAS_DETAIL_1

      public static final BrowserVersionFeatures EVENT_CONTEXT_MENU_HAS_DETAIL_1
      The context menu MouseEvent has a detail of 1.

    • EVENT_FOCUS_ON_LOAD

      public static final BrowserVersionFeatures EVENT_FOCUS_ON_LOAD
      Triggers the onfocus event when focusing the body on load.

    • EVENT_ONANIMATION_DOCUMENT_CREATE_NOT_SUPPORTED

      public static final BrowserVersionFeatures EVENT_ONANIMATION_DOCUMENT_CREATE_NOT_SUPPORTED
      AnimationEvent can not be created by calling document.createEvent('AnimationEvent').

    • EVENT_ONCLICK_USES_POINTEREVENT

      public static final BrowserVersionFeatures EVENT_ONCLICK_USES_POINTEREVENT
      Triggers 'onclick' event handler using PointerEvent.

    • EVENT_ONCLOSE_DOCUMENT_CREATE_NOT_SUPPORTED

      public static final BrowserVersionFeatures EVENT_ONCLOSE_DOCUMENT_CREATE_NOT_SUPPORTED
      CloseEvent can not be created by calling document.createEvent('CloseEvent').

    • EVENT_ONPOPSTATE_DOCUMENT_CREATE_NOT_SUPPORTED

      public static final BrowserVersionFeatures EVENT_ONPOPSTATE_DOCUMENT_CREATE_NOT_SUPPORTED
      PopStateEvent can not be created by calling document.createEvent('PopStateEvent').

    • EVENT_TYPE_MUTATIONEVENT

      public static final BrowserVersionFeatures EVENT_TYPE_MUTATIONEVENT
      Supports event type 'TextEvent'.

    • EVENT_TYPE_TEXTEVENT

      public static final BrowserVersionFeatures EVENT_TYPE_TEXTEVENT
      Supports event type 'TextEvent'.

    • EVENT_TYPE_WHEELEVENT

      public static final BrowserVersionFeatures EVENT_TYPE_WHEELEVENT
      Supports event type 'WheelEvent'.

    • FORM_IGNORE_REL_NOREFERRER

      public static final BrowserVersionFeatures FORM_IGNORE_REL_NOREFERRER
      Form elements are able to refer to the for by using the from attribute.

    • FORM_SUBMISSION_HEADER_CACHE_CONTROL_MAX_AGE

      public static final BrowserVersionFeatures FORM_SUBMISSION_HEADER_CACHE_CONTROL_MAX_AGE
      Form submit includes the Cache-Control: max-age=0 header.

    • HTMLBASEFONT_END_TAG_FORBIDDEN

      public static final BrowserVersionFeatures HTMLBASEFONT_END_TAG_FORBIDDEN
      Should org.htmlunit.javascript.host.html.HTMLBaseFontElement#isEndTagForbidden().

    • HTMLBUTTON_WILL_VALIDATE_IGNORES_READONLY

      public static final BrowserVersionFeatures HTMLBUTTON_WILL_VALIDATE_IGNORES_READONLY
      willValidate does not check the readonly property.

    • HTMLCOLLECTION_NAMED_ITEM_ID_FIRST

      public static final BrowserVersionFeatures HTMLCOLLECTION_NAMED_ITEM_ID_FIRST
      HtmlCollection.namedItem searches by id first.

    • HTMLDOCUMENT_COOKIES_IGNORE_BLANK

      public static final BrowserVersionFeatures HTMLDOCUMENT_COOKIES_IGNORE_BLANK
      Calling cookies setter with blank string does not reset the cookies.

    • HTMLDOCUMENT_ELEMENTS_BY_NAME_EMPTY

      public static final BrowserVersionFeatures HTMLDOCUMENT_ELEMENTS_BY_NAME_EMPTY
      /** document.getElementsByName returns an empty list if called with the empty string.

    • HTMLDOCUMENT_GET_ALSO_FRAMES

      public static final BrowserVersionFeatures HTMLDOCUMENT_GET_ALSO_FRAMES
      Calls to document.XYZ also looks at frames.

    • HTMLELEMENT_REMOVE_ACTIVE_TRIGGERS_BLUR_EVENT

      public static final BrowserVersionFeatures HTMLELEMENT_REMOVE_ACTIVE_TRIGGERS_BLUR_EVENT
      Removing the active element from the dom tree triggers the onblur event.

    • HTMLIMAGE_BLANK_SRC_AS_EMPTY

      public static final BrowserVersionFeatures HTMLIMAGE_BLANK_SRC_AS_EMPTY
      Handle blank source like empty.

    • HTMLIMAGE_EMPTY_SRC_DISPLAY_FALSE

      public static final BrowserVersionFeatures HTMLIMAGE_EMPTY_SRC_DISPLAY_FALSE
      Empty src attribute sets display to false.

    • HTMLIMAGE_HTMLELEMENT

      public static final BrowserVersionFeatures HTMLIMAGE_HTMLELEMENT
      Is document.cretaeElement('image') an HTMLElement.

    • HTMLIMAGE_HTMLUNKNOWNELEMENT

      public static final BrowserVersionFeatures HTMLIMAGE_HTMLUNKNOWNELEMENT
      Is document.cretaeElement('image') an HTMLUnknownElement.

    • HTMLIMAGE_NAME_VALUE_PARAMS

      public static final BrowserVersionFeatures HTMLIMAGE_NAME_VALUE_PARAMS
      Clicking an image input submits the value as param if defined.

    • HTMLINPUT_TYPE_IMAGE_IGNORES_CUSTOM_VALIDITY

      public static final BrowserVersionFeatures HTMLINPUT_TYPE_IMAGE_IGNORES_CUSTOM_VALIDITY
      HTMLInputElement image type is not supported.

    • HTMLINPUT_TYPE_MONTH_SUPPORTED

      public static final BrowserVersionFeatures HTMLINPUT_TYPE_MONTH_SUPPORTED
      HTMLInputElement month type is supported.

    • HTMLINPUT_TYPE_WEEK_SUPPORTED

      public static final BrowserVersionFeatures HTMLINPUT_TYPE_WEEK_SUPPORTED
      HTMLInputElement week type is supported.

    • HTMLSELECT_WILL_VALIDATE_IGNORES_READONLY

      public static final BrowserVersionFeatures HTMLSELECT_WILL_VALIDATE_IGNORES_READONLY
      willValidate does not check the readonly property.

    • HTMLTRACK_END_TAG_FORBIDDEN

      public static final BrowserVersionFeatures HTMLTRACK_END_TAG_FORBIDDEN
      Should org.htmlunit.javascript.host.html.HTMLTrackElement#isEndTagForbidden().

    • HTML_COMMAND_TAG

      public static final BrowserVersionFeatures HTML_COMMAND_TAG
      HTML parser supports the 'command' tag.

    • HTML_LAYER_TAG

      public static final BrowserVersionFeatures HTML_LAYER_TAG
      HTML parser supports the 'layer' tag.

    • HTTP_HEADER_CH_UA

      public static final BrowserVersionFeatures HTTP_HEADER_CH_UA
      Browser sends Sec-ch headers.

    • HTTP_HEADER_PRIORITY

      public static final BrowserVersionFeatures HTTP_HEADER_PRIORITY
      Browser sends Priority headers.

    • JS_ANCHOR_HOSTNAME_IGNORE_BLANK

      public static final BrowserVersionFeatures JS_ANCHOR_HOSTNAME_IGNORE_BLANK
      The anchor hostname setter ignores blank url's.

    • JS_ANCHOR_PATHNAME_DETECT_WIN_DRIVES_URL

      public static final BrowserVersionFeatures JS_ANCHOR_PATHNAME_DETECT_WIN_DRIVES_URL
      The anchor pathname detects url's starting with one letter as file url's.

    • JS_ANCHOR_PATHNAME_DETECT_WIN_DRIVES_URL_REPLACE

      public static final BrowserVersionFeatures JS_ANCHOR_PATHNAME_DETECT_WIN_DRIVES_URL_REPLACE
      The anchor pathname detects url's starting with one letter as file url's and replaces them with the file protocol.

    • JS_ANCHOR_PATHNAME_PREFIX_WIN_DRIVES_URL

      public static final BrowserVersionFeatures JS_ANCHOR_PATHNAME_PREFIX_WIN_DRIVES_URL
      The anchor pathname prefixes file url's with '/'.

    • JS_ANCHOR_PROTOCOL_COLON_UPPER_CASE_DRIVE_LETTERS

      public static final BrowserVersionFeatures JS_ANCHOR_PROTOCOL_COLON_UPPER_CASE_DRIVE_LETTERS
      The anchor protocol property converts drive letters to uppercase.

    • JS_AREA_WITHOUT_HREF_FOCUSABLE

      public static final BrowserVersionFeatures JS_AREA_WITHOUT_HREF_FOCUSABLE
      An area element without a href attribute is focusable.

    • JS_ARRAY_SORT_ACCEPTS_INCONSISTENT_COMPERATOR

      public static final BrowserVersionFeatures JS_ARRAY_SORT_ACCEPTS_INCONSISTENT_COMPERATOR
      Sorting an array using a user defined comperator accepts inconsistent iterators.

    • JS_AUDIO_PROCESSING_EVENT_CTOR

      public static final BrowserVersionFeatures JS_AUDIO_PROCESSING_EVENT_CTOR
      AudioProcessingEvent ctor is callable.

    • JS_CANVAS_DATA_URL_CHROME_PNG

      public static final BrowserVersionFeatures JS_CANVAS_DATA_URL_CHROME_PNG
      toDataURL for canvas returns the CHROME version of the PNG.

    • JS_CLIENTHEIGHT_INPUT_17

      public static final BrowserVersionFeatures JS_CLIENTHEIGHT_INPUT_17
      ClientHeight for input is 17.

    • JS_CLIENTHEIGHT_INPUT_18

      public static final BrowserVersionFeatures JS_CLIENTHEIGHT_INPUT_18
      ClientHeight for input is 18.

    • JS_CLIENTHEIGHT_RADIO_CHECKBOX_10

      public static final BrowserVersionFeatures JS_CLIENTHEIGHT_RADIO_CHECKBOX_10
      ClientHeight for radio button and checkbox is 10.

    • JS_CLIENTHEIGHT_RADIO_CHECKBOX_14

      public static final BrowserVersionFeatures JS_CLIENTHEIGHT_RADIO_CHECKBOX_14
      ClientHeight for radio button and checkbox is 14.

    • JS_CLIENTWIDTH_INPUT_TEXT_154

      public static final BrowserVersionFeatures JS_CLIENTWIDTH_INPUT_TEXT_154
      ClientWidth for text/password input is 154.

    • JS_CLIENTWIDTH_INPUT_TEXT_173

      public static final BrowserVersionFeatures JS_CLIENTWIDTH_INPUT_TEXT_173
      ClientWidth for text/password input is 173.

    • JS_CLIENTWIDTH_RADIO_CHECKBOX_10

      public static final BrowserVersionFeatures JS_CLIENTWIDTH_RADIO_CHECKBOX_10
      ClientWidth for radio button and checkbox is 10.

    • JS_CLIENTWIDTH_RADIO_CHECKBOX_14

      public static final BrowserVersionFeatures JS_CLIENTWIDTH_RADIO_CHECKBOX_14
      ClientWidth for radio button and checkbox is 14.

    • JS_CSSRULELIST_ENUM_ITEM_LENGTH

      public static final BrowserVersionFeatures JS_CSSRULELIST_ENUM_ITEM_LENGTH
      item is enumerated before length property of CSSRuleList.

    • JS_DOCUMENT_EVALUATE_RECREATES_RESULT

      public static final BrowserVersionFeatures JS_DOCUMENT_EVALUATE_RECREATES_RESULT
      Javascript document.evaluate creates a new result object even if provided as param.

    • JS_DOCUMENT_SELECTION_RANGE_COUNT

      public static final BrowserVersionFeatures JS_DOCUMENT_SELECTION_RANGE_COUNT
      The browser has selection rangeCount.

    • JS_ERROR_CAPTURE_STACK_TRACE

      public static final BrowserVersionFeatures JS_ERROR_CAPTURE_STACK_TRACE
      Javascript Error.captureStackTrace.

    • JS_ERROR_STACK_TRACE_LIMIT

      public static final BrowserVersionFeatures JS_ERROR_STACK_TRACE_LIMIT
      Javascript Error.stackTraceLimit.

    • JS_EVENT_INPUT_CTOR_INPUTTYPE

      public static final BrowserVersionFeatures JS_EVENT_INPUT_CTOR_INPUTTYPE
      Javascript InputEvent reads the inputType property from data.

    • JS_EVENT_KEYBOARD_CTOR_WHICH

      public static final BrowserVersionFeatures JS_EVENT_KEYBOARD_CTOR_WHICH
      Javascript KeyboardEvent reads the which property from data.

    • JS_EVENT_LOAD_SUPPRESSED_BY_CONTENT_SECURIRY_POLICY

      public static final BrowserVersionFeatures JS_EVENT_LOAD_SUPPRESSED_BY_CONTENT_SECURIRY_POLICY
      do not trigger the onload event if the frame content was not shown because of the csp.

    • JS_FORM_DISPATCHEVENT_SUBMITS

      public static final BrowserVersionFeatures JS_FORM_DISPATCHEVENT_SUBMITS
      form.dispatchEvent(e) submits the form if the event is of type 'submit'.

    • JS_IFRAME_ALWAYS_EXECUTE_ONLOAD

      public static final BrowserVersionFeatures JS_IFRAME_ALWAYS_EXECUTE_ONLOAD
      Executes the onload handler, regardless of the whether the element was already attached to the page.

    • JS_IMAGE_WIDTH_HEIGHT_RETURNS_16x16_0x0

      public static final BrowserVersionFeatures JS_IMAGE_WIDTH_HEIGHT_RETURNS_16x16_0x0
      Getting the width and height of an image tag without a source returns 16x16; for invalid values returns 0.

    • JS_IMAGE_WIDTH_HEIGHT_RETURNS_24x24_0x0

      public static final BrowserVersionFeatures JS_IMAGE_WIDTH_HEIGHT_RETURNS_24x24_0x0
      Getting the width and height of an image tag without a source returns 24x24; for invalid values returns 0x0.

    • JS_INNER_TEXT_SVG_NL

      public static final BrowserVersionFeatures JS_INNER_TEXT_SVG_NL
      Indicates that innerText add a nl when reaching svg element.

    • JS_INPUT_CHANGE_TYPE_DROPS_VALUE_WEEK_MONTH

      public static final BrowserVersionFeatures JS_INPUT_CHANGE_TYPE_DROPS_VALUE_WEEK_MONTH
      The value is ignored when the type of an week/month input is changed.

    • JS_INPUT_NUMBER_ACCEPT_ALL

      public static final BrowserVersionFeatures JS_INPUT_NUMBER_ACCEPT_ALL
      FF accepts all chars.

    • JS_INPUT_NUMBER_DOT_AT_END_IS_DOUBLE

      public static final BrowserVersionFeatures JS_INPUT_NUMBER_DOT_AT_END_IS_DOUBLE
      FF comma at end is not an integer.

    • JS_INTL_V8_BREAK_ITERATOR

      public static final BrowserVersionFeatures JS_INTL_V8_BREAK_ITERATOR
      Indicates that Intl.v8BreakIterator is supported.

    • JS_ITERATOR_VISIBLE_IN_WINDOW

      public static final BrowserVersionFeatures JS_ITERATOR_VISIBLE_IN_WINDOW
      Indicates that window.Iterator is supported.

    • JS_LOCATION_IGNORE_QUERY_FOR_ABOUT_PROTOCOL

      public static final BrowserVersionFeatures JS_LOCATION_IGNORE_QUERY_FOR_ABOUT_PROTOCOL
      For the 'about' protocol the location always returns an empty query.

    • JS_LOCATION_RELOAD_REFERRER

      public static final BrowserVersionFeatures JS_LOCATION_RELOAD_REFERRER
      Reload sends a referrer header.

    • JS_MENU_TYPE_PASS

      public static final BrowserVersionFeatures JS_MENU_TYPE_PASS
      Type property of menu returns the current (maybe invalid) value.

    • JS_NATIVE_FUNCTION_TOSTRING_COMPACT

      public static final BrowserVersionFeatures JS_NATIVE_FUNCTION_TOSTRING_COMPACT
      Indicates if the String representation of a native function is without newline.

    • JS_NATIVE_FUNCTION_TOSTRING_NL

      public static final BrowserVersionFeatures JS_NATIVE_FUNCTION_TOSTRING_NL
      Indicates if the String representation of a native function has a newline for empty parameter list.

    • JS_NAVIGATOR_DO_NOT_TRACK_UNSPECIFIED

      public static final BrowserVersionFeatures JS_NAVIGATOR_DO_NOT_TRACK_UNSPECIFIED
      Navigator.doNotTrack returns unspecified if not set.

    • JS_OFFSET_PARENT_NULL_IF_FIXED

      public static final BrowserVersionFeatures JS_OFFSET_PARENT_NULL_IF_FIXED
      Indicates that someObj.offsetParent returns null, it someObj has fixed style.

    • JS_OUTER_HTML_THROWS_FOR_DETACHED

      public static final BrowserVersionFeatures JS_OUTER_HTML_THROWS_FOR_DETACHED
      element.outerHTML removes all children from detached node.

    • JS_PROPERTY_DESCRIPTOR_NAME

      public static final BrowserVersionFeatures JS_PROPERTY_DESCRIPTOR_NAME
      Indicates that the Object.getOwnPropertyDescriptor.get contains name.

    • JS_SCRIPT_IN_TEMPLATE_EXECUTED_ON_ATTACH

      public static final BrowserVersionFeatures JS_SCRIPT_IN_TEMPLATE_EXECUTED_ON_ATTACH
      script tags created from js as child of templates are processed if added to the dom.

    • JS_SELECTOR_TEXT_LOWERCASE

      public static final BrowserVersionFeatures JS_SELECTOR_TEXT_LOWERCASE
      Javascript selectorText property returns selectors in lower case.

    • JS_SELECT_REMOVE_IGNORE_IF_INDEX_OUTSIDE

      public static final BrowserVersionFeatures JS_SELECT_REMOVE_IGNORE_IF_INDEX_OUTSIDE
      Indicates that select.options.remove ignores the call if index is too large.

    • JS_STORAGE_PRESERVED_INCLUDED

      public static final BrowserVersionFeatures JS_STORAGE_PRESERVED_INCLUDED
      Whether to add to the storage even preserved words.

    • JS_STYLE_WORD_SPACING_ACCEPTS_PERCENT

      public static final BrowserVersionFeatures JS_STYLE_WORD_SPACING_ACCEPTS_PERCENT
      Indicates wordSpacing support percent values.

    • JS_TABLE_SPAN_SET_ZERO_IF_INVALID

      public static final BrowserVersionFeatures JS_TABLE_SPAN_SET_ZERO_IF_INVALID
      Set span zo zero if provided value is invalid.

    • JS_WINDOW_COMPUTED_STYLE_PSEUDO_ACCEPT_WITHOUT_COLON

      public static final BrowserVersionFeatures JS_WINDOW_COMPUTED_STYLE_PSEUDO_ACCEPT_WITHOUT_COLON
      window.getComputedStyle works with pseudo selectors without colon in front.

    • JS_WINDOW_INSTALL_TRIGGER_NULL

      public static final BrowserVersionFeatures JS_WINDOW_INSTALL_TRIGGER_NULL
      Javascript InstallTrigger property set to null.

    • JS_WINDOW_OUTER_INNER_HEIGHT_DIFF_138

      public static final BrowserVersionFeatures JS_WINDOW_OUTER_INNER_HEIGHT_DIFF_138
      Difference of window.outer/inner height is 138.

    • JS_WINDOW_OUTER_INNER_HEIGHT_DIFF_147

      public static final BrowserVersionFeatures JS_WINDOW_OUTER_INNER_HEIGHT_DIFF_147
      Difference of window.outer/inner height is 147.

    • JS_WINDOW_OUTER_INNER_HEIGHT_DIFF_91

      public static final BrowserVersionFeatures JS_WINDOW_OUTER_INNER_HEIGHT_DIFF_91
      Difference of window.outer/inner height is 91.

    • JS_WINDOW_OUTER_INNER_HEIGHT_DIFF_93

      public static final BrowserVersionFeatures JS_WINDOW_OUTER_INNER_HEIGHT_DIFF_93
      Difference of window.outer/inner height is 93.

    • JS_WINDOW_SELECTION_NULL_IF_INVISIBLE

      public static final BrowserVersionFeatures JS_WINDOW_SELECTION_NULL_IF_INVISIBLE
      Window.getSelection returns null, if the window is not visible.

    • JS_XSLT_TRANSFORM_INDENT

      public static final BrowserVersionFeatures JS_XSLT_TRANSFORM_INDENT
      XSLTProcessor.transformToDocument supports output indent attribute.

    • KEYBOARD_EVENT_SPECIAL_KEYPRESS

      public static final BrowserVersionFeatures KEYBOARD_EVENT_SPECIAL_KEYPRESS
      With special keys [in .type(int)], should we trigger onkeypress event or not.

    • XHR_ALL_RESPONSE_HEADERS_SEPARATE_BY_LF

      public static final BrowserVersionFeatures XHR_ALL_RESPONSE_HEADERS_SEPARATE_BY_LF
      XMLHttpRequest.getAllResponseHeaders() uses only Lf as separator.

    • XHR_HANDLE_SYNC_NETWORK_ERRORS

      public static final BrowserVersionFeatures XHR_HANDLE_SYNC_NETWORK_ERRORS
      Indicates that the Browser handles async and sync network errors the same way.

    • XHR_LOAD_ALWAYS_AFTER_DONE

      public static final BrowserVersionFeatures XHR_LOAD_ALWAYS_AFTER_DONE
      XMLHttpRequest triggers the load events also if the abort was signaled.

    • XHR_RESPONSE_TEXT_EMPTY_UNSENT

      public static final BrowserVersionFeatures XHR_RESPONSE_TEXT_EMPTY_UNSENT
      If state unsent the response text is empty even if the response type is wrong.

    • XHR_SEND_NETWORK_ERROR_IF_ABORTED

      public static final BrowserVersionFeatures XHR_SEND_NETWORK_ERROR_IF_ABORTED
      Indicates if the XMLHttpRequest.send() method will throw if aborted.

  • Method Details

    • values

      public static BrowserVersionFeatures[] values()
      Returns an array containing the constants of this enum class, in the order they are declared.
      Returns:
      an array containing the constants of this enum class, in the order they are declared

    • valueOf

      public static BrowserVersionFeatures valueOf(String name)
      Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)
      Parameters:
      name - the name of the enum constant to be returned.
      Returns:
      the enum constant with the specified name
      Throws:
      IllegalArgumentException - if this enum class has no constant with the specified name
      NullPointerException - if the argument is null