diff --git a/css-checks/src/test/java/org/sonar/css/checks/common/ObsoletePseudoCheckTest.java b/css-checks/src/test/java/org/sonar/css/checks/common/ObsoletePseudoCheckTest.java
index 10ddbcd6..7c45dd2d 100644
--- a/css-checks/src/test/java/org/sonar/css/checks/common/ObsoletePseudoCheckTest.java
+++ b/css-checks/src/test/java/org/sonar/css/checks/common/ObsoletePseudoCheckTest.java
@@ -23,11 +23,29 @@
 import org.sonar.css.checks.CheckTestUtils;
 import org.sonar.css.checks.verifier.CssCheckVerifier;
 
+import java.io.File;
+
 public class ObsoletePseudoCheckTest {
 
+  private ObsoletePseudoCheck check = new ObsoletePseudoCheck();
+
+  @Test
+  public void test_css() {
+    CssCheckVerifier.verifyCssFile(check, getTestFile("obsoletePseudos.css"));
+  }
+
   @Test
-  public void test() {
-    CssCheckVerifier.verifyCssFile(new ObsoletePseudoCheck(), CheckTestUtils.getCommonTestFile("obsoletePseudos.css"));
+  public void test_less() {
+    CssCheckVerifier.verifyLessFile(check, getTestFile("obsoletePseudos.less"));
+  }
+
+  @Test
+  public void test_scss() {
+    CssCheckVerifier.verifyScssFile(check, getTestFile("obsoletePseudos.scss"));
+  }
+
+  private File getTestFile(String fileName) {
+    return CheckTestUtils.getCommonTestFile("obsolete-pseudos/" + fileName);
   }
 
 }
diff --git a/css-checks/src/test/resources/checks/common/obsolete-pseudos/obsoletePseudos.css b/css-checks/src/test/resources/checks/common/obsolete-pseudos/obsoletePseudos.css
new file mode 100644
index 00000000..926345f2
--- /dev/null
+++ b/css-checks/src/test/resources/checks/common/obsolete-pseudos/obsoletePseudos.css
@@ -0,0 +1,11 @@
+:any(ol, ul, menu, dir) { /* Noncompliant ![sc=2;ec=5;el=+0]! !{Remove this usage of the obsolete / not on W3C Standards track "any" pseudo.}! */
+  color: #000000;
+}
+
+::ng-deep { /* Noncompliant ![sc=3;ec=10;el=+0]! !{Remove this usage of the obsolete / not on W3C Standards track "ng-deep" pseudo.}! */
+  color: #000000;
+}
+
+p:empty {
+  color: #000000;
+}
diff --git a/css-checks/src/test/resources/checks/common/obsolete-pseudos/obsoletePseudos.less b/css-checks/src/test/resources/checks/common/obsolete-pseudos/obsoletePseudos.less
new file mode 100644
index 00000000..926345f2
--- /dev/null
+++ b/css-checks/src/test/resources/checks/common/obsolete-pseudos/obsoletePseudos.less
@@ -0,0 +1,11 @@
+:any(ol, ul, menu, dir) { /* Noncompliant ![sc=2;ec=5;el=+0]! !{Remove this usage of the obsolete / not on W3C Standards track "any" pseudo.}! */
+  color: #000000;
+}
+
+::ng-deep { /* Noncompliant ![sc=3;ec=10;el=+0]! !{Remove this usage of the obsolete / not on W3C Standards track "ng-deep" pseudo.}! */
+  color: #000000;
+}
+
+p:empty {
+  color: #000000;
+}
diff --git a/css-checks/src/test/resources/checks/common/obsolete-pseudos/obsoletePseudos.scss b/css-checks/src/test/resources/checks/common/obsolete-pseudos/obsoletePseudos.scss
new file mode 100644
index 00000000..926345f2
--- /dev/null
+++ b/css-checks/src/test/resources/checks/common/obsolete-pseudos/obsoletePseudos.scss
@@ -0,0 +1,11 @@
+:any(ol, ul, menu, dir) { /* Noncompliant ![sc=2;ec=5;el=+0]! !{Remove this usage of the obsolete / not on W3C Standards track "any" pseudo.}! */
+  color: #000000;
+}
+
+::ng-deep { /* Noncompliant ![sc=3;ec=10;el=+0]! !{Remove this usage of the obsolete / not on W3C Standards track "ng-deep" pseudo.}! */
+  color: #000000;
+}
+
+p:empty {
+  color: #000000;
+}
diff --git a/css-checks/src/test/resources/checks/common/obsoletePseudos.css b/css-checks/src/test/resources/checks/common/obsoletePseudos.css
deleted file mode 100644
index f17dd6a9..00000000
--- a/css-checks/src/test/resources/checks/common/obsoletePseudos.css
+++ /dev/null
@@ -1,7 +0,0 @@
-:any(ol, ul, menu, dir) { /* Noncompliant ![sc=2;ec=5;el=+0]! !{Remove this usage of the obsolete / not on W3C Standards track "any" pseudo.}! */
-  list-style-type: square;
-}
-
-p:empty {
-  color: red;
-}
diff --git a/css-frontend/src/main/java/org/sonar/css/model/pseudo/pseudoidentifier/StandardPseudoIdentifierFactory.java b/css-frontend/src/main/java/org/sonar/css/model/pseudo/pseudoidentifier/StandardPseudoIdentifierFactory.java
index 12066c4d..bb7bcf08 100644
--- a/css-frontend/src/main/java/org/sonar/css/model/pseudo/pseudoidentifier/StandardPseudoIdentifierFactory.java
+++ b/css-frontend/src/main/java/org/sonar/css/model/pseudo/pseudoidentifier/StandardPseudoIdentifierFactory.java
@@ -20,12 +20,11 @@
 package org.sonar.css.model.pseudo.pseudoidentifier;
 
 import com.google.common.collect.ImmutableSet;
-
-import java.util.*;
-
 import org.sonar.css.model.pseudo.pseudoidentifier.standard.*;
 import org.sonar.css.model.pseudo.pseudoidentifier.standard.Optional;
 
+import java.util.*;
+
 public class StandardPseudoIdentifierFactory {
 
   private static final Set<Class> ALL_PSEUDO_IDENTIFIER_CLASSES = ImmutableSet.of(
@@ -64,6 +63,7 @@ public class StandardPseudoIdentifierFactory {
     Left.class,
     Link.class,
     Marker.class,
+    NgDeep.class,
     OnlyChild.class,
     OnlyOfType.class,
     Optional.class,
diff --git a/css-frontend/src/main/java/org/sonar/css/model/pseudo/pseudoidentifier/standard/NgDeep.java b/css-frontend/src/main/java/org/sonar/css/model/pseudo/pseudoidentifier/standard/NgDeep.java
new file mode 100644
index 00000000..a3a05b1c
--- /dev/null
+++ b/css-frontend/src/main/java/org/sonar/css/model/pseudo/pseudoidentifier/standard/NgDeep.java
@@ -0,0 +1,31 @@
+/*
+ * SonarQube CSS / SCSS / Less Analyzer
+ * Copyright (C) 2013-2017 David RACODON
+ * mailto: david.racodon@gmail.com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+package org.sonar.css.model.pseudo.pseudoidentifier.standard;
+
+import org.sonar.css.model.pseudo.pseudoidentifier.StandardPseudoIdentifier;
+
+public class NgDeep extends StandardPseudoIdentifier {
+
+  public NgDeep() {
+    setObsolete(true);
+    addLinks("https://angular.io/guide/component-styles#deprecated-deep--and-ng-deep");
+  }
+
+}
diff --git a/css-frontend/src/test/java/org/sonar/css/model/pseudo/StandardPseudoComponentFactoryTest.java b/css-frontend/src/test/java/org/sonar/css/model/pseudo/StandardPseudoComponentFactoryTest.java
index 1c80db7e..a448abcd 100644
--- a/css-frontend/src/test/java/org/sonar/css/model/pseudo/StandardPseudoComponentFactoryTest.java
+++ b/css-frontend/src/test/java/org/sonar/css/model/pseudo/StandardPseudoComponentFactoryTest.java
@@ -27,7 +27,7 @@ public class StandardPseudoComponentFactoryTest {
 
   @Test
   public void number_of_standard_pseudo_components() {
-    assertEquals(75, StandardPseudoComponentFactory.getAll().size());
+    assertEquals(76, StandardPseudoComponentFactory.getAll().size());
   }
 
 }
diff --git a/css-frontend/src/test/java/org/sonar/css/model/pseudo/pseudoidentifier/StandardPseudoIdentifierFactoryTest.java b/css-frontend/src/test/java/org/sonar/css/model/pseudo/pseudoidentifier/StandardPseudoIdentifierFactoryTest.java
index 975410bb..6169c729 100644
--- a/css-frontend/src/test/java/org/sonar/css/model/pseudo/pseudoidentifier/StandardPseudoIdentifierFactoryTest.java
+++ b/css-frontend/src/test/java/org/sonar/css/model/pseudo/pseudoidentifier/StandardPseudoIdentifierFactoryTest.java
@@ -61,12 +61,12 @@ public void should_return_a_valid_first_line_pseudo_identifier_object_mix_upperc
 
   @Test
   public void number_of_standard_pseudo_identifiers() {
-    assertEquals(58, StandardPseudoIdentifierFactory.getAll().size());
+    assertEquals(59, StandardPseudoIdentifierFactory.getAll().size());
   }
 
   @Test
-  public void number_of_obsolete_pseudo_functions() {
-    assertEquals(0, StandardPseudoIdentifierFactory.getAll().stream().filter(StandardPseudoIdentifier::isObsolete).count());
+  public void number_of_obsolete_pseudo_identifiers() {
+    assertEquals(1, StandardPseudoIdentifierFactory.getAll().stream().filter(StandardPseudoIdentifier::isObsolete).count());
   }
 
   @Test
diff --git a/its/ruling/projects/custom/common/obsolete-pseudos/obsoletePseudos.css b/its/ruling/projects/custom/common/obsolete-pseudos/obsoletePseudos.css
new file mode 100644
index 00000000..926345f2
--- /dev/null
+++ b/its/ruling/projects/custom/common/obsolete-pseudos/obsoletePseudos.css
@@ -0,0 +1,11 @@
+:any(ol, ul, menu, dir) { /* Noncompliant ![sc=2;ec=5;el=+0]! !{Remove this usage of the obsolete / not on W3C Standards track "any" pseudo.}! */
+  color: #000000;
+}
+
+::ng-deep { /* Noncompliant ![sc=3;ec=10;el=+0]! !{Remove this usage of the obsolete / not on W3C Standards track "ng-deep" pseudo.}! */
+  color: #000000;
+}
+
+p:empty {
+  color: #000000;
+}
diff --git a/its/ruling/projects/custom/common/obsolete-pseudos/obsoletePseudos.less b/its/ruling/projects/custom/common/obsolete-pseudos/obsoletePseudos.less
new file mode 100644
index 00000000..926345f2
--- /dev/null
+++ b/its/ruling/projects/custom/common/obsolete-pseudos/obsoletePseudos.less
@@ -0,0 +1,11 @@
+:any(ol, ul, menu, dir) { /* Noncompliant ![sc=2;ec=5;el=+0]! !{Remove this usage of the obsolete / not on W3C Standards track "any" pseudo.}! */
+  color: #000000;
+}
+
+::ng-deep { /* Noncompliant ![sc=3;ec=10;el=+0]! !{Remove this usage of the obsolete / not on W3C Standards track "ng-deep" pseudo.}! */
+  color: #000000;
+}
+
+p:empty {
+  color: #000000;
+}
diff --git a/its/ruling/projects/custom/common/obsolete-pseudos/obsoletePseudos.scss b/its/ruling/projects/custom/common/obsolete-pseudos/obsoletePseudos.scss
new file mode 100644
index 00000000..926345f2
--- /dev/null
+++ b/its/ruling/projects/custom/common/obsolete-pseudos/obsoletePseudos.scss
@@ -0,0 +1,11 @@
+:any(ol, ul, menu, dir) { /* Noncompliant ![sc=2;ec=5;el=+0]! !{Remove this usage of the obsolete / not on W3C Standards track "any" pseudo.}! */
+  color: #000000;
+}
+
+::ng-deep { /* Noncompliant ![sc=3;ec=10;el=+0]! !{Remove this usage of the obsolete / not on W3C Standards track "ng-deep" pseudo.}! */
+  color: #000000;
+}
+
+p:empty {
+  color: #000000;
+}
diff --git a/its/ruling/projects/custom/common/obsoletePseudos.css b/its/ruling/projects/custom/common/obsoletePseudos.css
deleted file mode 100644
index f17dd6a9..00000000
--- a/its/ruling/projects/custom/common/obsoletePseudos.css
+++ /dev/null
@@ -1,7 +0,0 @@
-:any(ol, ul, menu, dir) { /* Noncompliant ![sc=2;ec=5;el=+0]! !{Remove this usage of the obsolete / not on W3C Standards track "any" pseudo.}! */
-  list-style-type: square;
-}
-
-p:empty {
-  color: red;
-}
diff --git a/its/ruling/tests/src/test/expected/css-line-length.json b/its/ruling/tests/src/test/expected/css-line-length.json
index 94ed5994..abf15fa4 100644
--- a/its/ruling/tests/src/test/expected/css-line-length.json
+++ b/its/ruling/tests/src/test/expected/css-line-length.json
@@ -174,15 +174,16 @@
 12,
 13,
 ],
+'project:custom/common/obsolete-pseudos/obsoletePseudos.css':[
+1,
+5,
+],
 'project:custom/common/obsoleteProperties.css':[
 2,
 3,
 4,
 5,
 ],
-'project:custom/common/obsoletePseudos.css':[
-1,
-],
 'project:custom/common/oneDeclarationPerLine.css':[
 19,
 ],
diff --git a/its/ruling/tests/src/test/expected/css-named-color.json b/its/ruling/tests/src/test/expected/css-named-color.json
index f67e682d..67becbb5 100644
--- a/its/ruling/tests/src/test/expected/css-named-color.json
+++ b/its/ruling/tests/src/test/expected/css-named-color.json
@@ -4475,9 +4475,6 @@
 'project:custom/common/obsoleteProperties.css':[
 6,
 ],
-'project:custom/common/obsoletePseudos.css':[
-6,
-],
 'project:custom/common/oneDeclarationPerLine.css':[
 3,
 4,
diff --git a/its/ruling/tests/src/test/expected/css-obsolete-pseudos.json b/its/ruling/tests/src/test/expected/css-obsolete-pseudos.json
index acf57bfe..41aa7b83 100644
--- a/its/ruling/tests/src/test/expected/css-obsolete-pseudos.json
+++ b/its/ruling/tests/src/test/expected/css-obsolete-pseudos.json
@@ -1,5 +1,6 @@
 {
-'project:custom/common/obsoletePseudos.css':[
+'project:custom/common/obsolete-pseudos/obsoletePseudos.css':[
 1,
+5,
 ],
 }
diff --git a/its/ruling/tests/src/test/expected/less-line-length.json b/its/ruling/tests/src/test/expected/less-line-length.json
index 96e7f603..3f708efc 100644
--- a/its/ruling/tests/src/test/expected/less-line-length.json
+++ b/its/ruling/tests/src/test/expected/less-line-length.json
@@ -87,6 +87,10 @@
 12,
 13,
 ],
+'project:custom/common/obsolete-pseudos/obsoletePseudos.less':[
+1,
+5,
+],
 'project:custom/common/properties/less/accelerator.less':[
 5,
 ],
diff --git a/its/ruling/tests/src/test/expected/less-obsolete-pseudos.json b/its/ruling/tests/src/test/expected/less-obsolete-pseudos.json
new file mode 100644
index 00000000..fdb6d929
--- /dev/null
+++ b/its/ruling/tests/src/test/expected/less-obsolete-pseudos.json
@@ -0,0 +1,6 @@
+{
+'project:custom/common/obsolete-pseudos/obsoletePseudos.less':[
+1,
+5,
+],
+}
diff --git a/its/ruling/tests/src/test/expected/less-prefer-single-line-comments.json b/its/ruling/tests/src/test/expected/less-prefer-single-line-comments.json
index 445748c5..146d3490 100644
--- a/its/ruling/tests/src/test/expected/less-prefer-single-line-comments.json
+++ b/its/ruling/tests/src/test/expected/less-prefer-single-line-comments.json
@@ -255,6 +255,10 @@
 12,
 13,
 ],
+'project:custom/common/obsolete-pseudos/obsoletePseudos.less':[
+1,
+5,
+],
 'project:custom/common/properties/less/accelerator.less':[
 5,
 6,
diff --git a/its/ruling/tests/src/test/expected/scss-line-length.json b/its/ruling/tests/src/test/expected/scss-line-length.json
index b202cd72..2778b67f 100644
--- a/its/ruling/tests/src/test/expected/scss-line-length.json
+++ b/its/ruling/tests/src/test/expected/scss-line-length.json
@@ -111,6 +111,10 @@
 12,
 13,
 ],
+'project:custom/common/obsolete-pseudos/obsoletePseudos.scss':[
+1,
+5,
+],
 'project:custom/common/properties/scss/accelerator.scss':[
 5,
 ],
diff --git a/its/ruling/tests/src/test/expected/scss-obsolete-pseudos.json b/its/ruling/tests/src/test/expected/scss-obsolete-pseudos.json
new file mode 100644
index 00000000..7ec55707
--- /dev/null
+++ b/its/ruling/tests/src/test/expected/scss-obsolete-pseudos.json
@@ -0,0 +1,6 @@
+{
+'project:custom/common/obsolete-pseudos/obsoletePseudos.scss':[
+1,
+5,
+],
+}
diff --git a/its/ruling/tests/src/test/expected/scss-prefer-single-line-comments.json b/its/ruling/tests/src/test/expected/scss-prefer-single-line-comments.json
index 4ed8c019..654470d1 100644
--- a/its/ruling/tests/src/test/expected/scss-prefer-single-line-comments.json
+++ b/its/ruling/tests/src/test/expected/scss-prefer-single-line-comments.json
@@ -292,6 +292,10 @@
 12,
 13,
 ],
+'project:custom/common/obsolete-pseudos/obsoletePseudos.scss':[
+1,
+5,
+],
 'project:custom/common/properties/scss/accelerator.scss':[
 5,
 6,