diff --git a/src/bold/boldediting.js b/src/bold/boldediting.js
index 60da082..ee1438e 100644
--- a/src/bold/boldediting.js
+++ b/src/bold/boldediting.js
@@ -28,6 +28,7 @@ export default class BoldEditing extends Plugin {
 		const editor = this.editor;
 		// Allow bold attribute on text nodes.
 		editor.model.schema.extend( '$text', { allowAttributes: BOLD } );
+		editor.model.schema.setAttributeProperties( BOLD, { isFormatting: true } );
 
 		// Build converter from model to view for data and editing pipelines.
 
diff --git a/src/code/codeediting.js b/src/code/codeediting.js
index 1a52de1..04a6132 100644
--- a/src/code/codeediting.js
+++ b/src/code/codeediting.js
@@ -29,6 +29,7 @@ export default class CodeEditing extends Plugin {
 
 		// Allow code attribute on text nodes.
 		editor.model.schema.extend( '$text', { allowAttributes: CODE } );
+		editor.model.schema.setAttributeProperties( CODE, { isFormatting: true } );
 
 		editor.conversion.attributeToElement( {
 			model: CODE,
diff --git a/src/italic/italicediting.js b/src/italic/italicediting.js
index 72cd210..cb37870 100644
--- a/src/italic/italicediting.js
+++ b/src/italic/italicediting.js
@@ -29,6 +29,7 @@ export default class ItalicEditing extends Plugin {
 
 		// Allow italic attribute on text nodes.
 		editor.model.schema.extend( '$text', { allowAttributes: ITALIC } );
+		editor.model.schema.setAttributeProperties( ITALIC, { isFormatting: true } );
 
 		editor.conversion.attributeToElement( {
 			model: ITALIC,
diff --git a/src/strikethrough/strikethroughediting.js b/src/strikethrough/strikethroughediting.js
index 8393a2f..d03a419 100644
--- a/src/strikethrough/strikethroughediting.js
+++ b/src/strikethrough/strikethroughediting.js
@@ -30,6 +30,7 @@ export default class StrikethroughEditing extends Plugin {
 
 		// Allow strikethrough attribute on text nodes.
 		editor.model.schema.extend( '$text', { allowAttributes: STRIKETHROUGH } );
+		editor.model.schema.setAttributeProperties( STRIKETHROUGH, { isFormatting: true } );
 
 		editor.conversion.attributeToElement( {
 			model: STRIKETHROUGH,
diff --git a/src/subscript/subscriptediting.js b/src/subscript/subscriptediting.js
index 7624679..a965432 100644
--- a/src/subscript/subscriptediting.js
+++ b/src/subscript/subscriptediting.js
@@ -28,6 +28,7 @@ export default class SubscriptEditing extends Plugin {
 		const editor = this.editor;
 		// Allow sub attribute on text nodes.
 		editor.model.schema.extend( '$text', { allowAttributes: SUBSCRIPT } );
+		editor.model.schema.setAttributeProperties( SUBSCRIPT, { isFormatting: true } );
 
 		// Build converter from model to view for data and editing pipelines.
 
diff --git a/src/superscript/superscriptediting.js b/src/superscript/superscriptediting.js
index 63fc8b9..60218c6 100644
--- a/src/superscript/superscriptediting.js
+++ b/src/superscript/superscriptediting.js
@@ -28,6 +28,7 @@ export default class SuperscriptEditing extends Plugin {
 		const editor = this.editor;
 		// Allow super attribute on text nodes.
 		editor.model.schema.extend( '$text', { allowAttributes: SUPERSCRIPT } );
+		editor.model.schema.setAttributeProperties( SUPERSCRIPT, { isFormatting: true } );
 
 		// Build converter from model to view for data and editing pipelines.
 
diff --git a/src/underline/underlineediting.js b/src/underline/underlineediting.js
index 561e63b..e16c624 100644
--- a/src/underline/underlineediting.js
+++ b/src/underline/underlineediting.js
@@ -29,6 +29,7 @@ export default class UnderlineEditing extends Plugin {
 
 		// Allow strikethrough attribute on text nodes.
 		editor.model.schema.extend( '$text', { allowAttributes: UNDERLINE } );
+		editor.model.schema.setAttributeProperties( UNDERLINE, { isFormatting: true } );
 
 		editor.conversion.attributeToElement( {
 			model: UNDERLINE,
diff --git a/tests/bold/boldediting.js b/tests/bold/boldediting.js
index e918cd5..06212db 100644
--- a/tests/bold/boldediting.js
+++ b/tests/bold/boldediting.js
@@ -40,6 +40,12 @@ describe( 'BoldEditing', () => {
 		expect( model.schema.checkAttribute( [ '$clipboardHolder', '$text' ], 'bold' ) ).to.be.true;
 	} );
 
+	it( 'should be marked with a formatting property', () => {
+		expect( model.schema.getAttributeProperties( 'bold' ) ).to.deep.equal( {
+			isFormatting: true
+		} );
+	} );
+
 	it( 'should set editor keystroke', () => {
 		const spy = sinon.spy( editor, 'execute' );
 		const keyEventData = {
diff --git a/tests/code/codeediting.js b/tests/code/codeediting.js
index e9e7ee2..1a06954 100644
--- a/tests/code/codeediting.js
+++ b/tests/code/codeediting.js
@@ -39,6 +39,12 @@ describe( 'CodeEditing', () => {
 		expect( model.schema.checkAttribute( [ '$clipboardHolder', '$text' ], 'code' ) ).to.be.true;
 	} );
 
+	it( 'should be marked with a formatting property', () => {
+		expect( model.schema.getAttributeProperties( 'code' ) ).to.deep.equal( {
+			isFormatting: true
+		} );
+	} );
+
 	describe( 'command', () => {
 		it( 'should register code command', () => {
 			const command = editor.commands.get( 'code' );
diff --git a/tests/italic/italicediting.js b/tests/italic/italicediting.js
index 61bf465..9b97dac 100644
--- a/tests/italic/italicediting.js
+++ b/tests/italic/italicediting.js
@@ -39,6 +39,12 @@ describe( 'ItalicEditing', () => {
 		expect( model.schema.checkAttribute( [ '$clipboardHolder', '$text' ], 'italic' ) ).to.be.true;
 	} );
 
+	it( 'should be marked with a formatting property', () => {
+		expect( model.schema.getAttributeProperties( 'italic' ) ).to.deep.equal( {
+			isFormatting: true
+		} );
+	} );
+
 	describe( 'command', () => {
 		it( 'should register italic command', () => {
 			const command = editor.commands.get( 'italic' );
diff --git a/tests/strikethrough/strikethroughediting.js b/tests/strikethrough/strikethroughediting.js
index 3960a55..a7f2f00 100644
--- a/tests/strikethrough/strikethroughediting.js
+++ b/tests/strikethrough/strikethroughediting.js
@@ -39,6 +39,12 @@ describe( 'StrikethroughEditing', () => {
 		expect( model.schema.checkAttribute( [ '$clipboardHolder', '$text' ], 'strikethrough' ) ).to.be.true;
 	} );
 
+	it( 'should be marked with a formatting property', () => {
+		expect( model.schema.getAttributeProperties( 'strikethrough' ) ).to.deep.equal( {
+			isFormatting: true
+		} );
+	} );
+
 	describe( 'command', () => {
 		it( 'should register strikethrough command', () => {
 			const command = editor.commands.get( 'strikethrough' );
diff --git a/tests/subscript/subscriptediting.js b/tests/subscript/subscriptediting.js
index 9ef8dff..2ff9c77 100644
--- a/tests/subscript/subscriptediting.js
+++ b/tests/subscript/subscriptediting.js
@@ -39,6 +39,12 @@ describe( 'SubEditing', () => {
 		expect( model.schema.checkAttribute( [ '$clipboardHolder', '$text' ], 'subscript' ) ).to.be.true;
 	} );
 
+	it( 'should be marked with a formatting property', () => {
+		expect( model.schema.getAttributeProperties( 'subscript' ) ).to.deep.equal( {
+			isFormatting: true
+		} );
+	} );
+
 	describe( 'command', () => {
 		it( 'should register subscript command', () => {
 			const command = editor.commands.get( 'subscript' );
diff --git a/tests/superscript/superscriptediting.js b/tests/superscript/superscriptediting.js
index e41ea4b..058ef37 100644
--- a/tests/superscript/superscriptediting.js
+++ b/tests/superscript/superscriptediting.js
@@ -39,6 +39,12 @@ describe( 'SuperEditing', () => {
 		expect( model.schema.checkAttribute( [ '$clipboardHolder', '$text' ], 'superscript' ) ).to.be.true;
 	} );
 
+	it( 'should be marked with a formatting property', () => {
+		expect( model.schema.getAttributeProperties( 'superscript' ) ).to.deep.equal( {
+			isFormatting: true
+		} );
+	} );
+
 	describe( 'command', () => {
 		it( 'should register superscript command', () => {
 			const command = editor.commands.get( 'superscript' );
diff --git a/tests/underline/underlineediting.js b/tests/underline/underlineediting.js
index e25da30..1722456 100644
--- a/tests/underline/underlineediting.js
+++ b/tests/underline/underlineediting.js
@@ -39,6 +39,12 @@ describe( 'UnderlineEditing', () => {
 		expect( model.schema.checkAttribute( [ '$clipboardHolder', '$text' ], 'underline' ) ).to.be.true;
 	} );
 
+	it( 'should be marked with a formatting property', () => {
+		expect( model.schema.getAttributeProperties( 'underline' ) ).to.deep.equal( {
+			isFormatting: true
+		} );
+	} );
+
 	describe( 'command', () => {
 		it( 'should register underline command', () => {
 			const command = editor.commands.get( 'underline' );