feat: report CSS absolute/fixed positioning as USAGE

- `CSS-006` and `CSS-017` that report position fixed/absolute are now
  `USAGE` messages (instead of `WARNING`)
- Removes `CSS-027` as it would be a duplicate of `CSS-017`
- Command line severity tests now use a missing title as the `WARNING`
  trigger (instead of the now usage-only absolute positionning)

Fix #889

src/main/java/com/adobe/epubcheck/ctc/css/EpubCSSCheckCSSHandler.java

@@ -506,15 +506,14 @@ void checkTermsAndValues(CssGrammar.CssDeclaration declaration)
   {
     if (!isGlobalFixedFormat || hasIndividualFixedFormatDocuments)
     {
-      MessageId id = hasIndividualFixedFormatDocuments ? MessageId.CSS_027 : MessageId.CSS_017;
       if ("position".compareToIgnoreCase(declaration.getName().get()) == 0)
       {
         for (CssGrammar.CssConstruct construct : declaration.getComponents())
         {
           if (construct.getType() == CssGrammar.CssConstruct.Type.KEYWORD &&
               "absolute".compareToIgnoreCase(construct.toCssString()) == 0)
           {
-            getReport().message(id, getCorrectedEPUBLocation(path, declaration.getLocation().getLine(), declaration.getLocation().getColumn(), declaration.toCssString()), declaration.getName().get());
+            getReport().message(MessageId.CSS_017, getCorrectedEPUBLocation(path, declaration.getLocation().getLine(), declaration.getLocation().getColumn(), declaration.toCssString()), declaration.getName().get());
             break;
           }
         }

src/main/java/com/adobe/epubcheck/messages/DefaultSeverities.java

@@ -70,7 +70,7 @@ private void initialize()
     severities.put(MessageId.CSS_003, Severity.ERROR);
     severities.put(MessageId.CSS_004, Severity.ERROR);
     severities.put(MessageId.CSS_005, Severity.ERROR);
-    severities.put(MessageId.CSS_006, Severity.WARNING);
+    severities.put(MessageId.CSS_006, Severity.USAGE);
     severities.put(MessageId.CSS_007, Severity.INFO);
     severities.put(MessageId.CSS_008, Severity.ERROR);
     severities.put(MessageId.CSS_009, Severity.USAGE);
@@ -80,15 +80,14 @@ private void initialize()
     severities.put(MessageId.CSS_013, Severity.USAGE);
     severities.put(MessageId.CSS_015, Severity.ERROR);
     severities.put(MessageId.CSS_016, Severity.SUPPRESSED);
-    severities.put(MessageId.CSS_017, Severity.WARNING);
+    severities.put(MessageId.CSS_017, Severity.USAGE);
     severities.put(MessageId.CSS_019, Severity.WARNING);
     severities.put(MessageId.CSS_020, Severity.ERROR);
     severities.put(MessageId.CSS_021, Severity.USAGE);
     severities.put(MessageId.CSS_022, Severity.USAGE);
     severities.put(MessageId.CSS_023, Severity.USAGE);
     severities.put(MessageId.CSS_024, Severity.USAGE);
     severities.put(MessageId.CSS_025, Severity.USAGE);
-    severities.put(MessageId.CSS_027, Severity.USAGE);
     severities.put(MessageId.CSS_028, Severity.USAGE);
 
     // HTML

src/main/java/com/adobe/epubcheck/messages/MessageId.java

@@ -81,7 +81,6 @@ public enum MessageId implements Comparable<MessageId>
   CSS_023("CSS-023"),
   CSS_024("CSS-024"),
   CSS_025("CSS-025"),
-  CSS_027("CSS-027"),
   CSS_028("CSS-028"),
 
   // Messages relating to xhtml markup

src/main/resources/com/adobe/epubcheck/messages/MessageBundle.properties

@@ -40,7 +40,7 @@ CSS_002=Empty or NULL reference found.
 CSS_003=Only UTF-8 and UTF-16 encodings are allowed, detected %1$s.
 CSS_004=Only UTF-8 and UTF-16 encodings are allowed, detected %1$s BOM.
 CSS_005=Conflicting alternate style attributes found: %1$s.
-CSS_006=CSS position:fixed property should not be used in EPUBs.
+CSS_006=CSS selector specifies fixed position.
 CSS_007=Font-face reference %1$s refers to non-standard font type %2$s.
 CSS_008=An error occurred while parsing the CSS: %1$s.
 CSS_009=Use of certain CSS such as Columns, Transforms, Transitions, box-sizing or KeyFrames can cause pagination issues.
@@ -63,7 +63,6 @@ CSS_024=CSS class Selector is not used.
 CSS_024_SUG=Remove unused CSS selectors.
 CSS_025=CSS class Selector could not be found.
 CSS_025_SUG=Check for typos or define a class selector to document the use of the class.
-CSS_027=CSS selector specifies absolute position.
 CSS_028=Use of Font-face declaration.
 
 #HTM - XHTML related messages

src/main/resources/com/adobe/epubcheck/messages/MessageBundle_de.properties

@@ -63,7 +63,6 @@ CSS_024=CSS-Klasse wird nicht verwendet.
 CSS_024_SUG=Entferne unbenutzte CSS-Selektoren/-Klassen.
 CSS_025=CSS-Klasse wurde nicht gefunden.
 CSS_025_SUG=Überprüfe die Angabe der CSS-Klasse auf Schreibfehler oder definiere einen neuen Klassen-Selektor im CSS.
-CSS_027=CSS-Selektor enthält Anweisungen zu absoluter Positionierung.
 CSS_028=Eine 'font-face'-Deklaration wird genutzt.
 
 #HTM - XHTML related messages

src/main/resources/com/adobe/epubcheck/messages/MessageBundle_es.properties

@@ -63,7 +63,6 @@ CSS_024=El selector de clase CSS no se utiliza.
 CSS_024_SUG=Elimine los selectores CSS no usados.
 CSS_025=No se encuentra el selector de clase CSS.
 CSS_025_SUG=Compruebe la sintaxis o defina un selector de clase para documentar el uso de la clase.
-CSS_027=El selector CSS especifica una posición absoluta.
 CSS_028=Uso de declaración 'font-face'.
 
 #HTM - XHTML related messages

src/main/resources/com/adobe/epubcheck/messages/MessageBundle_fr.properties

@@ -63,7 +63,6 @@ CSS_024=Le sélecteur CSS de classe n'est pas utilisé.
 CSS_024_SUG=Supprimez les sélecteurs CSS inutilisés.
 CSS_025=Le sélecteur CSS de classe est introuvable.
 CSS_025_SUG=Vérifiez les fautes de frappe ou définissez un sélecteur de classe pour attester de l'utilisation de la classe.
-CSS_027=Le sélecteur CSS spécifie une position absolue.
 CSS_028=Utilisation d'une déclaration font-face.
 
 #HTM - XHTML related messages

src/main/resources/com/adobe/epubcheck/messages/MessageBundle_it.properties

@@ -63,7 +63,6 @@ CSS_024=La regola CSS 'class' non è usata.
 CSS_024_SUG=È consigliabile rimuovere le regole CSS non usate.
 CSS_025=La regola CSS 'class' non è stata trovata.
 CSS_025_SUG=È consigliabile controllare di non aver compiuto un errore nel nome della classe o definire una 'class' effettivamente usata.
-CSS_027=La regola CSS specifica una posizione assoluta.
 CSS_028=La regola CSS specifica una 'font-face'.
 
 #HTM - XHTML related messages

src/main/resources/com/adobe/epubcheck/messages/MessageBundle_ja.properties

@@ -63,7 +63,6 @@ CSS_024=CSSクラスセレクタが使われていません.
 CSS_024_SUG=使用していないCSSセレクタを削除してください.
 CSS_025=CSSクラスセレクタが見つけられませんでした.
 CSS_025_SUG=タイプミスをチェックするか、クラスを利用するセレクタを定義してください.
-CSS_027=CSSセレクタでabsolute positionを指定しています.
 CSS_028=Font-face宣言が使われています.
 
 #HTM - XHTML related messages

src/main/resources/com/adobe/epubcheck/messages/MessageBundle_ko_KR.properties

@@ -63,7 +63,6 @@ CSS_024=클래스 셀렉터가 사용되지 않습니다.
 CSS_024_SUG=사용하지 않은 선택자를 제거하십시요.
 CSS_025=클래스 선택자를 찾을 수 없습니다.
 CSS_025_SUG=오타가 없는지 확인하거나 사용하려는 클래스 선택자를 추가하십시요.
-CSS_027=선택자가 absolute position 속성을 사용하였습니다.
 CSS_028='font-face' 선언을 사용합니다.
 
 #HTM - XHTML related messages

src/main/resources/com/adobe/epubcheck/messages/MessageBundle_nl.properties

@@ -63,7 +63,6 @@ CSS_024=CSS class - bijvoorbeeld .voorbeeld - wordt niet gebruikt.
 CSS_024_SUG=Verwijder ongebruikte CSS selectors.
 CSS_025=De CSS class selector werd niet aangetroffen.
 CSS_025_SUG=Controleer op typefouten of definieer een class selector om het gebruik van de class te documenteren.
-CSS_027=De CSS selector specificeert een absolute positie.
 CSS_028=Gebruik van font-face verklaring.
 
 #HTM - XHTML related messages

src/main/resources/com/adobe/epubcheck/messages/MessageBundle_pt_BR.properties

@@ -63,7 +63,6 @@ CSS_024=O seletor de classe CSS não é utilizado.
 CSS_024_SUG=Remova seletores CSS não utilizados.
 CSS_025=O seletor de classe CSS não foi localizado.
 CSS_025_SUG=Verifique erros de digitação ou defina um seletor de classe para documentar o uso da classe.
-CSS_027=O seletor CSS especifica posição absoluta.
 CSS_028=Uso de declaração Font-face.
 
 #HTM - XHTML related messages

src/test/java/com/adobe/epubcheck/api/Epub30CheckExpandedTest.java

@@ -270,7 +270,6 @@ public void testValidateEPUB30_CSSURLS_2()
   @Test
   public void testValidateEPUB30_CSSURLS_3()
   {
-    Collections.addAll(expectedWarnings, MessageId.CSS_017);
     Collections.addAll(expectedErrors, MessageId.CSS_020, MessageId.CSS_020);
     // 'imgs/table_header_bg_uni.jpg': referenced resource missing in the
     // package

src/test/resources/com/adobe/epubcheck/test/command_line/failonwarnings/OPS/style_tag_css.xhtml

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
 <head>
-    <title>Transform - Style Tag</title>
+    <!-- <title>Transform - Style Tag</title> -->
     <style type="text/css">
         .rotateY {
             background-color:yellow;

src/test/resources/com/adobe/epubcheck/test/command_line/failonwarnings_expected_results.json

@@ -40,8 +40,8 @@
     "suggestion" : "Inline styles are not compatible with accessibility settings and display personalization. Use CSS Styles instead."
   }, {
     "ID" : "CSS-006",
-    "severity" : "WARNING",
-    "message" : "CSS position:fixed property should not be used in EPUBs.",
+    "severity" : "USAGE",
+    "message" : "CSS selector specifies fixed position.",
     "additionalLocations" : 0,
     "locations" : [ {
       "path" : "OPS/style.css",
@@ -94,7 +94,32 @@
       "context" : ""
     } ],
     "suggestion" : null
-  } ],
+  }, {
+    "ID" : "HTM-033",
+    "severity" : "USAGE",
+    "message" : "HTML 'head' element does not have a 'title' child element.",
+    "additionalLocations" : 0,
+    "locations" : [ {
+      "path" : "OPS/style_tag_css.xhtml",
+      "line" : 16,
+      "column" : 8,
+      "context" : null
+    } ],
+    "suggestion" : null
+  }, {
+    "ID" : "RSC-017",
+    "severity" : "WARNING",
+    "message" : "Warning while parsing file: The 'head' element should have a 'title' child element.",
+    "additionalLocations" : 0,
+    "locations" : [ {
+      "path" : "OPS/style_tag_css.xhtml",
+      "line" : 3,
+      "column" : 7,
+      "context" : null
+    } ],
+    "suggestion" : null
+  }  
+  ],
   "customMessageFileName" : null,
   "checker" : {
     "path" : "./com/adobe/epubcheck/test/command_line/failonwarnings.epub",
@@ -105,7 +130,7 @@
     "nFatal" : 0,
     "nError" : 0,
     "nWarning" : 1,
-    "nUsage" : 4
+    "nUsage" : 6
   },
   "publication" : {
     "publisher" : null,
@@ -128,7 +153,7 @@
     "isBackwardCompatible" : true,
     "hasAudio" : false,
     "hasVideo" : false,
-    "charsCount" : 648,
+    "charsCount" : 627,
     "embeddedFonts" : [ ],
     "refFonts" : [ ],
     "hasEncryption" : false,
@@ -249,10 +274,10 @@
     "id" : "page02",
     "fileName" : "OPS/style_tag_css.xhtml",
     "media_type" : "application/xhtml+xml",
-    "compressedSize" : 263,
-    "uncompressedSize" : 563,
+    "compressedSize" : 269,
+    "uncompressedSize" : 572,
     "compressionMethod" : "Deflated",
-    "checkSum" : "a4d45bfbd24ab97ff2bdaa17276c1bc88aa8a5aadbf06f3b28b2f5db91612f6",
+    "checkSum" : "9ade68841fe28761295789b39e412d95cd26316e688f27cbac6ba2fc6f8840",
     "isSpineItem" : true,
     "spineIndex" : 1,
     "isLinear" : true,

src/test/resources/com/adobe/epubcheck/test/command_line/listSeverities_expected_results.txt

@@ -28,7 +28,7 @@ CSS-002	ERROR	Empty or NULL reference found.
 CSS-003	ERROR	Only UTF-8 and UTF-16 encodings are allowed, detected %1$s.	
 CSS-004	ERROR	Only UTF-8 and UTF-16 encodings are allowed, detected %1$s BOM.	
 CSS-005	ERROR	Conflicting alternate style attributes found: %1$s.	
-CSS-006	WARNING	CSS position:fixed property should not be used in EPUBs.	
+CSS-006	WARNING	CSS selector specifies fixed position.	
 CSS-007	WARNING	Font-face reference %1$s refers to non-standard font type %2$s.	
 CSS-008	ERROR	An error occurred while parsing the CSS: %1$s.	
 CSS-009	USAGE	Use of certain CSS such as Columns, Transforms, Transitions, box-sizing or KeyFrames can cause pagination issues.	
@@ -46,7 +46,7 @@ CSS-022	USAGE	CSS selector specifies global margin setting.
 CSS-023	USAGE	CSS selector specifies media query.	
 CSS-024	USAGE	CSS class Selector is not used.	Remove unused CSS selectors.
 CSS-025	USAGE	CSS class Selector could not be found.	Check for typos or define a class selector to document the use of the class.
-CSS-027	USAGE	CSS selector specifies absolute position.	
+CSS-017	USAGE	CSS selector specifies absolute position.	
 CSS-028	USAGE	Use of Font-face declaration.	
 HTM-001	ERROR	Any publication resource that is an XML-based media type must be a valid XML 1.0 document. XML version found: %1$s.	
 HTM-002	WARNING	The installed xml parser doesn't support xml version verification. Xml files must be a valid XML 1.0 document.	

src/test/resources/com/adobe/epubcheck/test/command_line/severity/OPS/style_tag_css.xhtml

@@ -2,7 +2,7 @@
 <!DOCTYPE html>
 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
 <head>
-    <title>Unused - Style Tag CSS</title>
+	<!-- <title>Unused - Style Tag CSS</title> -->
     <style>
         .used {
             font-style: italic;

src/test/resources/com/adobe/epubcheck/test/command_line/severity_overrideBadId_expected_results.txt

@@ -2,17 +2,19 @@ Start command_line test('severity_overrideBadId')
 ERROR(CHK-002): ./com/adobe/epubcheck/test/command_line/severity(1,0): Unrecognized custom message id BogusID encountered in message overrides file './com/adobe/epubcheck/test/command_line/severity_overrideBadId.txt'.
 Validating using EPUB version 3.0.1 rules.
 ERROR(CSS-001): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style_tag_css.xhtml(27,13): The 'unicode-bidi' property must not be included in an EPUB Style Sheet.
-WARNING(CSS-006): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style_tag_css.xhtml(38,13): CSS position:fixed property should not be used in EPUBs.
+USAGE(CSS-006): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style_tag_css.xhtml(38,13): CSS selector specifies fixed position.
+WARNING(RSC-017): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style_tag_css.xhtml(4,7): Warning while parsing file: The 'head' element should have a 'title' child element.
 ERROR(CSS-001): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/inline_css.xhtml(14,1): The 'unicode-bidi' property must not be included in an EPUB Style Sheet.
 ERROR(CSS-001): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/inline_css.xhtml(14,22): The 'direction' property must not be included in an EPUB Style Sheet.
-WARNING(CSS-006): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/inline_css.xhtml(15,1): CSS position:fixed property should not be used in EPUBs.
+USAGE(CSS-006): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/inline_css.xhtml(15,1): CSS selector specifies fixed position.
 ERROR(CSS-001): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style.css(55,5): The 'unicode-bidi' property must not be included in an EPUB Style Sheet.
 ERROR(CSS-001): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style.css(56,5): The 'direction' property must not be included in an EPUB Style Sheet.
-WARNING(CSS-006): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style.css(66,5): CSS position:fixed property should not be used in EPUBs.
+USAGE(CSS-006): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style.css(66,5): CSS selector specifies fixed position.
 USAGE(ACC-008): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/toc.xhtml(-1,-1): Navigation Document has no 'landmarks nav' element.
 USAGE(HTM-010): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/toc.ncx(2,68): Namespace uri 'http://www.daisy.org/z3986/2005/ncx/' was found.
 USAGE(CSS-012): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/external_css.xhtml(6,62): Document links to multiple CSS files.
 USAGE(CSS-012): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/external_css.xhtml(7,66): Document links to multiple CSS files.
+USAGE(HTM-033): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style_tag_css.xhtml(4,7): HTML 'head' element does not have a 'title' child element.
 USAGE(ACC-014): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style.css(2,5): Value of CSS property 'font-size' does not use a relative size: '14px'
 USAGE(ACC-014): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style.css(7,5): Value of CSS property 'font-size' does not use a relative size: '12px'
 USAGE(ACC-015): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style.css(7,5): Value of CSS property 'line-height' does not use a relative size.
@@ -23,7 +25,7 @@ USAGE(ACC-014): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style.
 USAGE(ACC-015): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style.css(27,5): Value of CSS property 'line-height' does not use a relative size.
 USAGE(ACC-014): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style.css(35,5): Value of CSS property 'font-size' does not use a relative size: 'x-large'
 USAGE(ACC-014): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style.css(39,5): Value of CSS property 'font-size' does not use a relative size: 'large'
-WARNING(CSS-017): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style.css(70,5): CSS selector specifies absolute position.
+USAGE(CSS-017): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style.css(70,5): CSS selector specifies absolute position.
 USAGE(CSS-013): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style.css(79,5): CSS property is declared !Important.
 USAGE(ACC-014): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style.css(90,5): Value of CSS property 'font-size' does not use a relative size: 'large'
 USAGE(CSS-023): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style.css(97,1): CSS selector specifies media query.
@@ -35,15 +37,15 @@ USAGE(ACC-014): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/unused
 USAGE(ACC-014): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/unused.css(38,5): Value of CSS property 'font-size' does not use a relative size: '12px'
 USAGE(ACC-014): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/unused.css(51,5): Value of CSS property 'font-size' does not use a relative size: '11px'
 USAGE(ACC-014): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/unused.css(58,5): Value of CSS property 'font-size' does not use a relative size: '10px'
-WARNING(CSS-017): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/cssStyles.css(2,5): CSS selector specifies absolute position.
+USAGE(CSS-017): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/cssStyles.css(2,5): CSS selector specifies absolute position.
 USAGE(ACC-014): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/cssStyles.css(10,5): Value of CSS property 'font-size' does not use a relative size: '12px'
 USAGE(ACC-015): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/cssStyles.css(10,5): Value of CSS property 'line-height' does not use a relative size.
 USAGE(CSS-013): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/cssStyles.css(15,5): CSS property is declared !Important.
 USAGE(ACC-014): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/cssStyles.css(27,5): Value of CSS property 'font-size' does not use a relative size: 'large'
 USAGE(CSS-023): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/cssStyles.css(33,1): CSS selector specifies media query.
 USAGE(ACC-014): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/cssStyles.css(35,9): Value of CSS property 'font-size' does not use a relative size: 'large'
 USAGE(CSS-013): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style_tag_css.xhtml(9,13): CSS property is declared !Important.
-WARNING(CSS-017): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style_tag_css.xhtml(17,13): CSS selector specifies absolute position.
+USAGE(CSS-017): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style_tag_css.xhtml(17,13): CSS selector specifies absolute position.
 USAGE(CSS-023): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style_tag_css.xhtml(20,9): CSS selector specifies media query.
 USAGE(CSS-025): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style_tag_css.xhtml(54,24): CSS class Selector could not be found.
 USAGE(CSS-024): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/style_tag_css.xhtml(14,9): CSS class Selector is not used.
@@ -72,7 +74,7 @@ USAGE(CSS-024): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/unused
 USAGE(CSS-024): ./com/adobe/epubcheck/test/command_line/severity.epub/OPS/unused.css(66,3): CSS class Selector is not used.
 
 Check finished with errors
-Messages: 0 fatal / 6 errors / 6 warnings / 0 info / 58 usage
+Messages: 0 fatal / 6 errors / 1 warnings / 0 info / 65 usage
 
 EPUBCheck completed
 Completed command_line test('severity_overrideBadId')