diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/examples/index.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/examples/index.js
new file mode 100644
index 000000000000..a5d87be4ae5d
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/examples/index.js
@@ -0,0 +1,34 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+'use strict';
+
+var Value = require( '@stdlib/plot/vega/value/ctor' );
+var GroupEncodingSet = require( './../lib' );
+
+var encoding = new GroupEncodingSet({
+	'x': new Value({
+		'field': 'x',
+		'scale': 'xScale'
+	}),
+	'y': new Value({
+		'field': 'y',
+		'scale': 'yScale'
+	})
+});
+console.log( encoding.toJSON() );
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/change_event.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/change_event.js
new file mode 100644
index 000000000000..359afbfa206b
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/change_event.js
@@ -0,0 +1,41 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+'use strict';
+
+// MAIN //
+
+/**
+* Returns a new change event object.
+*
+* @private
+* @param {string} property - property name
+* @returns {Object} event object
+*/
+function event( property ) { // eslint-disable-line stdlib/no-redeclare
+	return {
+		'type': 'update',
+		'source': 'mark',
+		'property': property
+	};
+}
+
+
+// EXPORTS //
+
+module.exports = event;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/clip/get.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/clip/get.js
new file mode 100644
index 000000000000..49ff2f89e834
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/clip/get.js
@@ -0,0 +1,43 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+/* eslint-disable no-invalid-this */
+
+'use strict';
+
+// MODULES //
+
+var prop = require( './properties.js' );
+
+
+// MAIN //
+
+/**
+* Returns a value reference specifying a flag indicating whether visible group content should be clipped.
+*
+* @private
+* @returns {(Value|void)} value reference
+*/
+function get() {
+	return this[ prop.private ];
+}
+
+
+// EXPORTS //
+
+module.exports = get;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/clip/properties.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/clip/properties.js
new file mode 100644
index 000000000000..c11defca131d
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/clip/properties.js
@@ -0,0 +1,33 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+'use strict';
+
+// MODULES //
+
+var property2object = require( '@stdlib/plot/vega/base/property2object' );
+
+
+// MAIN //
+
+var obj = property2object( 'clip' );
+
+
+// EXPORTS //
+
+module.exports = obj;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/clip/set.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/clip/set.js
new file mode 100644
index 000000000000..4c4e211eda58
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/clip/set.js
@@ -0,0 +1,66 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+/* eslint-disable no-invalid-this */
+
+'use strict';
+
+// MODULES //
+
+var logger = require( 'debug' );
+var isValueReference = require( '@stdlib/plot/vega/base/assert/is-value-reference' );
+var isUndefined = require( '@stdlib/assert/is-undefined' );
+var format = require( '@stdlib/string/format' );
+var changeEvent = require( './../change_event.js' );
+var prop = require( './properties.js' );
+
+
+// VARIABLES //
+
+var debug = logger( 'vega:mark:group:encoding-set:set:'+prop.name );
+
+
+// MAIN //
+
+/**
+* Sets a flag indicating whether visible group content should be clipped.
+*
+* ## Notes
+*
+* -   Providing `undefined` "unsets" the configured value.
+*
+* @private
+* @param {(Value|void)} value - input value
+* @throws {TypeError} must be a value reference
+* @returns {void}
+*/
+function set( value ) {
+	if ( !isValueReference( value ) && !isUndefined( value ) ) {
+		throw new TypeError( format( 'invalid assignment. `%s` must be a value reference. Value: `%s`.', prop.name, value ) );
+	}
+	if ( value !== this[ prop.private ] ) {
+		debug( 'Current value: %s. New value: %s.', this[ prop.private ], value );
+		this[ prop.private ] = value;
+		this.emit( 'change', changeEvent( prop.name ) );
+	}
+}
+
+
+// EXPORTS //
+
+module.exports = set;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-bottom-left/get.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-bottom-left/get.js
new file mode 100644
index 000000000000..c05d3548c7f0
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-bottom-left/get.js
@@ -0,0 +1,43 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+/* eslint-disable no-invalid-this */
+
+'use strict';
+
+// MODULES //
+
+var prop = require( './properties.js' );
+
+
+// MAIN //
+
+/**
+* Returns a value reference specifying the corner radius (in pixels) for the bottom left corner.
+*
+* @private
+* @returns {(Value|void)} value reference
+*/
+function get() {
+	return this[ prop.private ];
+}
+
+
+// EXPORTS //
+
+module.exports = get;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-bottom-left/properties.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-bottom-left/properties.js
new file mode 100644
index 000000000000..689bbd9def1c
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-bottom-left/properties.js
@@ -0,0 +1,33 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+'use strict';
+
+// MODULES //
+
+var property2object = require( '@stdlib/plot/vega/base/property2object' );
+
+
+// MAIN //
+
+var obj = property2object( 'cornerRadiusBottomLeft' );
+
+
+// EXPORTS //
+
+module.exports = obj;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-bottom-left/set.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-bottom-left/set.js
new file mode 100644
index 000000000000..d6ab5374879b
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-bottom-left/set.js
@@ -0,0 +1,66 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+/* eslint-disable no-invalid-this */
+
+'use strict';
+
+// MODULES //
+
+var logger = require( 'debug' );
+var isValueReference = require( '@stdlib/plot/vega/base/assert/is-value-reference' );
+var isUndefined = require( '@stdlib/assert/is-undefined' );
+var format = require( '@stdlib/string/format' );
+var changeEvent = require( './../change_event.js' );
+var prop = require( './properties.js' );
+
+
+// VARIABLES //
+
+var debug = logger( 'vega:mark:group:encoding-set:set:'+prop.name );
+
+
+// MAIN //
+
+/**
+* Sets the corner radius (in pixels) for the bottom left corner.
+*
+* ## Notes
+*
+* -   Providing `undefined` "unsets" the configured value.
+*
+* @private
+* @param {(Value|void)} value - input value
+* @throws {TypeError} must be a value reference
+* @returns {void}
+*/
+function set( value ) {
+	if ( !isValueReference( value ) && !isUndefined( value ) ) {
+		throw new TypeError( format( 'invalid assignment. `%s` must be a value reference. Value: `%s`.', prop.name, value ) );
+	}
+	if ( value !== this[ prop.private ] ) {
+		debug( 'Current value: %s. New value: %s.', this[ prop.private ], value );
+		this[ prop.private ] = value;
+		this.emit( 'change', changeEvent( prop.name ) );
+	}
+}
+
+
+// EXPORTS //
+
+module.exports = set;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-bottom-right/get.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-bottom-right/get.js
new file mode 100644
index 000000000000..ef87e41f2296
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-bottom-right/get.js
@@ -0,0 +1,43 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+/* eslint-disable no-invalid-this */
+
+'use strict';
+
+// MODULES //
+
+var prop = require( './properties.js' );
+
+
+// MAIN //
+
+/**
+* Returns a value reference specifying the corner radius (in pixels) for the bottom right corner.
+*
+* @private
+* @returns {(Value|void)} value reference
+*/
+function get() {
+	return this[ prop.private ];
+}
+
+
+// EXPORTS //
+
+module.exports = get;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-bottom-right/properties.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-bottom-right/properties.js
new file mode 100644
index 000000000000..8a04d8019397
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-bottom-right/properties.js
@@ -0,0 +1,33 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+'use strict';
+
+// MODULES //
+
+var property2object = require( '@stdlib/plot/vega/base/property2object' );
+
+
+// MAIN //
+
+var obj = property2object( 'cornerRadiusBottomRight' );
+
+
+// EXPORTS //
+
+module.exports = obj;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-bottom-right/set.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-bottom-right/set.js
new file mode 100644
index 000000000000..70bfddef6aaa
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-bottom-right/set.js
@@ -0,0 +1,66 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+/* eslint-disable no-invalid-this */
+
+'use strict';
+
+// MODULES //
+
+var logger = require( 'debug' );
+var isValueReference = require( '@stdlib/plot/vega/base/assert/is-value-reference' );
+var isUndefined = require( '@stdlib/assert/is-undefined' );
+var format = require( '@stdlib/string/format' );
+var changeEvent = require( './../change_event.js' );
+var prop = require( './properties.js' );
+
+
+// VARIABLES //
+
+var debug = logger( 'vega:mark:group:encoding-set:set:'+prop.name );
+
+
+// MAIN //
+
+/**
+* Sets the corner radius (in pixels) for the bottom right corner.
+*
+* ## Notes
+*
+* -   Providing `undefined` "unsets" the configured value.
+*
+* @private
+* @param {(Value|void)} value - input value
+* @throws {TypeError} must be a value reference
+* @returns {void}
+*/
+function set( value ) {
+	if ( !isValueReference( value ) && !isUndefined( value ) ) {
+		throw new TypeError( format( 'invalid assignment. `%s` must be a value reference. Value: `%s`.', prop.name, value ) );
+	}
+	if ( value !== this[ prop.private ] ) {
+		debug( 'Current value: %s. New value: %s.', this[ prop.private ], value );
+		this[ prop.private ] = value;
+		this.emit( 'change', changeEvent( prop.name ) );
+	}
+}
+
+
+// EXPORTS //
+
+module.exports = set;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-top-left/get.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-top-left/get.js
new file mode 100644
index 000000000000..56151f130b47
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-top-left/get.js
@@ -0,0 +1,43 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+/* eslint-disable no-invalid-this */
+
+'use strict';
+
+// MODULES //
+
+var prop = require( './properties.js' );
+
+
+// MAIN //
+
+/**
+* Returns a value reference specifying the corner radius (in pixels) for the top left corner.
+*
+* @private
+* @returns {(Value|void)} value reference
+*/
+function get() {
+	return this[ prop.private ];
+}
+
+
+// EXPORTS //
+
+module.exports = get;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-top-left/properties.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-top-left/properties.js
new file mode 100644
index 000000000000..9c57fc55cf61
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-top-left/properties.js
@@ -0,0 +1,33 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+'use strict';
+
+// MODULES //
+
+var property2object = require( '@stdlib/plot/vega/base/property2object' );
+
+
+// MAIN //
+
+var obj = property2object( 'cornerRadiusTopLeft' );
+
+
+// EXPORTS //
+
+module.exports = obj;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-top-left/set.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-top-left/set.js
new file mode 100644
index 000000000000..f838732d045c
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-top-left/set.js
@@ -0,0 +1,66 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+/* eslint-disable no-invalid-this */
+
+'use strict';
+
+// MODULES //
+
+var logger = require( 'debug' );
+var isValueReference = require( '@stdlib/plot/vega/base/assert/is-value-reference' );
+var isUndefined = require( '@stdlib/assert/is-undefined' );
+var format = require( '@stdlib/string/format' );
+var changeEvent = require( './../change_event.js' );
+var prop = require( './properties.js' );
+
+
+// VARIABLES //
+
+var debug = logger( 'vega:mark:group:encoding-set:set:'+prop.name );
+
+
+// MAIN //
+
+/**
+* Sets the corner radius (in pixels) for the top left corner.
+*
+* ## Notes
+*
+* -   Providing `undefined` "unsets" the configured value.
+*
+* @private
+* @param {(Value|void)} value - input value
+* @throws {TypeError} must be a value reference
+* @returns {void}
+*/
+function set( value ) {
+	if ( !isValueReference( value ) && !isUndefined( value ) ) {
+		throw new TypeError( format( 'invalid assignment. `%s` must be a value reference. Value: `%s`.', prop.name, value ) );
+	}
+	if ( value !== this[ prop.private ] ) {
+		debug( 'Current value: %s. New value: %s.', this[ prop.private ], value );
+		this[ prop.private ] = value;
+		this.emit( 'change', changeEvent( prop.name ) );
+	}
+}
+
+
+// EXPORTS //
+
+module.exports = set;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-top-right/get.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-top-right/get.js
new file mode 100644
index 000000000000..a44c9545e3f7
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-top-right/get.js
@@ -0,0 +1,43 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+/* eslint-disable no-invalid-this */
+
+'use strict';
+
+// MODULES //
+
+var prop = require( './properties.js' );
+
+
+// MAIN //
+
+/**
+* Returns a value reference specifying the corner radius (in pixels) for the top right corner.
+*
+* @private
+* @returns {(Value|void)} value reference
+*/
+function get() {
+	return this[ prop.private ];
+}
+
+
+// EXPORTS //
+
+module.exports = get;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-top-right/properties.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-top-right/properties.js
new file mode 100644
index 000000000000..48e338d55626
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-top-right/properties.js
@@ -0,0 +1,33 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+'use strict';
+
+// MODULES //
+
+var property2object = require( '@stdlib/plot/vega/base/property2object' );
+
+
+// MAIN //
+
+var obj = property2object( 'cornerRadiusTopRight' );
+
+
+// EXPORTS //
+
+module.exports = obj;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-top-right/set.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-top-right/set.js
new file mode 100644
index 000000000000..0fae4e4e798e
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius-top-right/set.js
@@ -0,0 +1,66 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+/* eslint-disable no-invalid-this */
+
+'use strict';
+
+// MODULES //
+
+var logger = require( 'debug' );
+var isValueReference = require( '@stdlib/plot/vega/base/assert/is-value-reference' );
+var isUndefined = require( '@stdlib/assert/is-undefined' );
+var format = require( '@stdlib/string/format' );
+var changeEvent = require( './../change_event.js' );
+var prop = require( './properties.js' );
+
+
+// VARIABLES //
+
+var debug = logger( 'vega:mark:group:encoding-set:set:'+prop.name );
+
+
+// MAIN //
+
+/**
+* Sets the corner radius (in pixels) for the top right corner.
+*
+* ## Notes
+*
+* -   Providing `undefined` "unsets" the configured value.
+*
+* @private
+* @param {(Value|void)} value - input value
+* @throws {TypeError} must be a value reference
+* @returns {void}
+*/
+function set( value ) {
+	if ( !isValueReference( value ) && !isUndefined( value ) ) {
+		throw new TypeError( format( 'invalid assignment. `%s` must be a value reference. Value: `%s`.', prop.name, value ) );
+	}
+	if ( value !== this[ prop.private ] ) {
+		debug( 'Current value: %s. New value: %s.', this[ prop.private ], value );
+		this[ prop.private ] = value;
+		this.emit( 'change', changeEvent( prop.name ) );
+	}
+}
+
+
+// EXPORTS //
+
+module.exports = set;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius/get.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius/get.js
new file mode 100644
index 000000000000..85bbff12f1e7
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius/get.js
@@ -0,0 +1,43 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+/* eslint-disable no-invalid-this */
+
+'use strict';
+
+// MODULES //
+
+var prop = require( './properties.js' );
+
+
+// MAIN //
+
+/**
+* Returns a value reference specifying the corner radius (in pixels) for all four corners.
+*
+* @private
+* @returns {(Value|void)} value reference
+*/
+function get() {
+	return this[ prop.private ];
+}
+
+
+// EXPORTS //
+
+module.exports = get;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius/properties.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius/properties.js
new file mode 100644
index 000000000000..00b6324d2957
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius/properties.js
@@ -0,0 +1,33 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+'use strict';
+
+// MODULES //
+
+var property2object = require( '@stdlib/plot/vega/base/property2object' );
+
+
+// MAIN //
+
+var obj = property2object( 'cornerRadius' );
+
+
+// EXPORTS //
+
+module.exports = obj;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius/set.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius/set.js
new file mode 100644
index 000000000000..2007ed3056d8
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/corner-radius/set.js
@@ -0,0 +1,66 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+/* eslint-disable no-invalid-this */
+
+'use strict';
+
+// MODULES //
+
+var logger = require( 'debug' );
+var isValueReference = require( '@stdlib/plot/vega/base/assert/is-value-reference' );
+var isUndefined = require( '@stdlib/assert/is-undefined' );
+var format = require( '@stdlib/string/format' );
+var changeEvent = require( './../change_event.js' );
+var prop = require( './properties.js' );
+
+
+// VARIABLES //
+
+var debug = logger( 'vega:mark:group:encoding-set:set:'+prop.name );
+
+
+// MAIN //
+
+/**
+* Sets the corner radius (in pixels) for all four corners.
+*
+* ## Notes
+*
+* -   Providing `undefined` "unsets" the configured value.
+*
+* @private
+* @param {(Value|void)} value - input value
+* @throws {TypeError} must be a value reference
+* @returns {void}
+*/
+function set( value ) {
+	if ( !isValueReference( value ) && !isUndefined( value ) ) {
+		throw new TypeError( format( 'invalid assignment. `%s` must be a value reference. Value: `%s`.', prop.name, value ) );
+	}
+	if ( value !== this[ prop.private ] ) {
+		debug( 'Current value: %s. New value: %s.', this[ prop.private ], value );
+		this[ prop.private ] = value;
+		this.emit( 'change', changeEvent( prop.name ) );
+	}
+}
+
+
+// EXPORTS //
+
+module.exports = set;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/index.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/index.js
new file mode 100644
index 000000000000..d9d2d5536683
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/index.js
@@ -0,0 +1,40 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+'use strict';
+
+/**
+* Group mark encoding set constructor.
+*
+* @module @stdlib/plot/vega/mark/group/encoding-set
+*
+* @example
+* var GroupEncodingSet = require( '@stdlib/plot/vega/mark/group/encoding-set' );
+*
+* var encoding = new GroupEncodingSet();
+* // returns <GroupEncodingSet>
+*/
+
+// MODULES //
+
+var main = require( './main.js' );
+
+
+// EXPORTS //
+
+module.exports = main;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/main.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/main.js
new file mode 100644
index 000000000000..85b96a2e36a5
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/main.js
@@ -0,0 +1,359 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+/* eslint-disable stdlib/no-empty-lines-between-requires */
+
+'use strict';
+
+// MODULES //
+
+var logger = require( 'debug' );
+var isObject = require( '@stdlib/assert/is-object' );
+var setNonEnumerableReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
+var setNonEnumerableReadOnlyAccessor = require( '@stdlib/utils/define-nonenumerable-read-only-accessor' ); // eslint-disable-line id-length
+var setReadWriteAccessor = require( '@stdlib/utils/define-read-write-accessor' );
+var hasProp = require( '@stdlib/assert/has-property' );
+var inherit = require( '@stdlib/utils/inherit' );
+var transformErrorMessage = require( '@stdlib/plot/vega/base/transform-validation-message' );
+var EncodingSet = require( '@stdlib/plot/vega/mark/base/encoding-set' );
+var format = require( '@stdlib/string/format' );
+var properties = require( './properties.json' );
+
+// Note: keep the following in alphabetical order according to the `require` path...
+var getClip = require( './clip/get.js' );
+var setClip = require( './clip/set.js' );
+
+var getCornerRadius = require( './corner-radius/get.js' );
+var setCornerRadius = require( './corner-radius/set.js' );
+
+var getCornerRadiusBottomLeft = require( './corner-radius-bottom-left/get.js' );
+var setCornerRadiusBottomLeft = require( './corner-radius-bottom-left/set.js' );
+
+var getCornerRadiusBottomRight = require( './corner-radius-bottom-right/get.js' ); // eslint-disable-line id-length
+var setCornerRadiusBottomRight = require( './corner-radius-bottom-right/set.js' ); // eslint-disable-line id-length
+
+var getCornerRadiusTopLeft = require( './corner-radius-top-left/get.js' );
+var setCornerRadiusTopLeft = require( './corner-radius-top-left/set.js' );
+
+var getCornerRadiusTopRight = require( './corner-radius-top-right/get.js' );
+var setCornerRadiusTopRight = require( './corner-radius-top-right/set.js' );
+
+var getProperties = require( './properties/get.js' );
+
+var getStrokeForeground = require( './stroke-foreground/get.js' );
+var setStrokeForeground = require( './stroke-foreground/set.js' );
+
+var getStrokeOffset = require( './stroke-offset/get.js' );
+var setStrokeOffset = require( './stroke-offset/set.js' );
+
+
+// VARIABLES //
+
+var debug = logger( 'vega:mark:group:encoding-set:main' );
+
+
+// MAIN //
+
+/**
+* Group mark encoding set constructor.
+*
+* @constructor
+* @param {Options} options - constructor options
+* @param {Value} [options.aria] - flag indicating whether to include ARIA attributes in SVG output
+* @param {Value} [options.blend] - color blend mode
+* @param {Value} [options.clip] - flag indicating whether visible group content should be clipped
+* @param {Value} [options.cornerRadius] - corner radius (in pixels) for all four corners
+* @param {Value} [options.cornerRadiusBottomLeft] - corner radius (in pixels) for the bottom left corner
+* @param {Value} [options.cornerRadiusBottomRight] - corner radius (in pixels) for the bottom right corner
+* @param {Value} [options.cornerRadiusTopLeft] - corner radius (in pixels) for the top left corner
+* @param {Value} [options.cornerRadiusTopRight] - corner radius (in pixels) for the top right corner
+* @param {Value} [options.cursor] - mouse cursor used over a mark
+* @param {Value} [options.description] - text description of a mark item for ARIA accessibility
+* @param {Value} [options.fill] - fill color
+* @param {Value} [options.fillOpacity] - fill opacity
+* @param {Value} [options.height] - mark height
+* @param {Value} [options.href] - URL to load upon mouse click
+* @param {Value} [options.opacity] - mark opacity
+* @param {Value} [options.stroke] - stroke color
+* @param {Value} [options.strokeCap] - stroke cap for line ending style
+* @param {Value} [options.strokeDash] - stroke dash
+* @param {Value} [options.strokeDashOffset] - pixel offset at which to start the dash array
+* @param {Value} [options.strokeForeground] - flag indicating whether the group stroke should be drawn on top of group content
+* @param {Value} [options.strokeJoin] - stroke line join method
+* @param {Value} [options.strokeMiterLimit] - miter limit at which to bevel a line join
+* @param {Value} [options.strokeOffset] - offset (in pixels) at which to draw the group stroke and fill
+* @param {Value} [options.strokeOpacity] - stroke opacity
+* @param {Value} [options.strokeWidth] - stroke width
+* @param {Value} [options.tooltip] - tooltip text to show upon mouse hover
+* @param {Value} [options.width] - mark width
+* @param {Value} [options.x] - primary x-coordinate
+* @param {Value} [options.x2] - secondary x-coordinate
+* @param {Value} [options.xc] - center x-coordinate
+* @param {Value} [options.y] - primary y-coordinate
+* @param {Value} [options.y2] - secondary y-coordinate
+* @param {Value} [options.yc] - center y-coordinate
+* @param {Value} [options.zindex] - layering order of sibling mark items
+* @throws {TypeError} options argument must be an object
+* @throws {Error} must provide valid options
+* @returns {GroupEncodingSet} encoding set instance
+*
+* @example
+* var encoding = new GroupEncodingSet();
+* // returns <GroupEncodingSet>
+*/
+function GroupEncodingSet( options ) {
+	var nargs;
+	var v;
+	var k;
+	var i;
+
+	nargs = arguments.length;
+	if ( !( this instanceof GroupEncodingSet ) ) {
+		if ( nargs === 0 ) {
+			return new GroupEncodingSet();
+		}
+		return new GroupEncodingSet( options );
+	}
+	EncodingSet.call( this );
+	if ( nargs ) {
+		if ( !isObject( options ) ) {
+			throw new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', options ) );
+		}
+		// Validate provided options by attempting to assign option values to corresponding fields...
+		for ( i = 0; i < properties.length; i++ ) {
+			k = properties[ i ];
+			if ( !hasProp( options, k ) ) {
+				continue;
+			}
+			v = options[ k ];
+			try {
+				this[ k ] = v;
+			} catch ( err ) {
+				debug( 'Encountered an error. Error: %s', err.message );
+
+				// FIXME: retain thrown error type
+				throw new Error( transformErrorMessage( err.message ) );
+			}
+		}
+	}
+	return this;
+}
+
+/*
+* Inherit from the `EncodingSet` prototype.
+*/
+inherit( GroupEncodingSet, EncodingSet );
+
+/**
+* Constructor name.
+*
+* @private
+* @name name
+* @memberof GroupEncodingSet
+* @readonly
+* @type {string}
+*/
+setNonEnumerableReadOnly( GroupEncodingSet, 'name', 'GroupEncodingSet' );
+
+/**
+* Encoding specifying a flag indicating whether visible group content should be clipped.
+*
+* @name clip
+* @memberof GroupEncodingSet.prototype
+* @type {(Value|void)}
+*
+* @example
+* var Value = require( '@stdlib/plot/vega/value/ctor' );
+*
+* var encoding = new GroupEncodingSet({
+*     'clip': new Value({
+*         'value': true
+*     })
+* });
+*
+* var v = encoding.clip;
+* // returns <Value>
+*/
+setReadWriteAccessor( GroupEncodingSet.prototype, 'clip', getClip, setClip );
+
+/**
+* Encoding specifying the corner radius (in pixels) for all four corners.
+*
+* @name cornerRadius
+* @memberof GroupEncodingSet.prototype
+* @type {(Value|void)}
+*
+* @example
+* var Value = require( '@stdlib/plot/vega/value/ctor' );
+*
+* var encoding = new GroupEncodingSet({
+*     'cornerRadius': new Value({
+*         'value': 5
+*     })
+* });
+*
+* var v = encoding.cornerRadius;
+* // returns <Value>
+*/
+setReadWriteAccessor( GroupEncodingSet.prototype, 'cornerRadius', getCornerRadius, setCornerRadius );
+
+/**
+* Encoding specifying the corner radius (in pixels) for the bottom left corner.
+*
+* @name cornerRadiusBottomLeft
+* @memberof GroupEncodingSet.prototype
+* @type {(Value|void)}
+*
+* @example
+* var Value = require( '@stdlib/plot/vega/value/ctor' );
+*
+* var encoding = new GroupEncodingSet({
+*     'cornerRadiusBottomLeft': new Value({
+*         'value': 5
+*     })
+* });
+*
+* var v = encoding.cornerRadiusBottomLeft;
+* // returns <Value>
+*/
+setReadWriteAccessor( GroupEncodingSet.prototype, 'cornerRadiusBottomLeft', getCornerRadiusBottomLeft, setCornerRadiusBottomLeft );
+
+/**
+* Encoding specifying the corner radius (in pixels) for the bottom right corner.
+*
+* @name cornerRadiusBottomRight
+* @memberof GroupEncodingSet.prototype
+* @type {(Value|void)}
+*
+* @example
+* var Value = require( '@stdlib/plot/vega/value/ctor' );
+*
+* var encoding = new GroupEncodingSet({
+*     'cornerRadiusBottomRight': new Value({
+*         'value': 5
+*     })
+* });
+*
+* var v = encoding.cornerRadiusBottomRight;
+* // returns <Value>
+*/
+setReadWriteAccessor( GroupEncodingSet.prototype, 'cornerRadiusBottomRight', getCornerRadiusBottomRight, setCornerRadiusBottomRight );
+
+/**
+* Encoding specifying the corner radius (in pixels) for the top left corner.
+*
+* @name cornerRadiusTopLeft
+* @memberof GroupEncodingSet.prototype
+* @type {(Value|void)}
+*
+* @example
+* var Value = require( '@stdlib/plot/vega/value/ctor' );
+*
+* var encoding = new GroupEncodingSet({
+*     'cornerRadiusTopLeft': new Value({
+*         'value': 5
+*     })
+* });
+*
+* var v = encoding.cornerRadiusTopLeft;
+* // returns <Value>
+*/
+setReadWriteAccessor( GroupEncodingSet.prototype, 'cornerRadiusTopLeft', getCornerRadiusTopLeft, setCornerRadiusTopLeft );
+
+/**
+* Encoding specifying the corner radius (in pixels) for the top right corner.
+*
+* @name cornerRadiusTopRight
+* @memberof GroupEncodingSet.prototype
+* @type {(Value|void)}
+*
+* @example
+* var Value = require( '@stdlib/plot/vega/value/ctor' );
+*
+* var encoding = new GroupEncodingSet({
+*     'cornerRadiusTopRight': new Value({
+*         'value': 5
+*     })
+* });
+*
+* var v = encoding.cornerRadiusTopRight;
+* // returns <Value>
+*/
+setReadWriteAccessor( GroupEncodingSet.prototype, 'cornerRadiusTopRight', getCornerRadiusTopRight, setCornerRadiusTopRight );
+
+/**
+* EncodingSet properties.
+*
+* @name properties
+* @memberof GroupEncodingSet.prototype
+* @type {Array<string>}
+*
+* @example
+* var encoding = new GroupEncodingSet();
+*
+* var v = encoding.properties;
+* // returns [...]
+*/
+setNonEnumerableReadOnlyAccessor( GroupEncodingSet.prototype, 'properties', getProperties );
+
+/**
+* Encoding specifying a flag indicating whether the group stroke should be drawn on top of group content.
+*
+* @name strokeForeground
+* @memberof GroupEncodingSet.prototype
+* @type {(Value|void)}
+*
+* @example
+* var Value = require( '@stdlib/plot/vega/value/ctor' );
+*
+* var encoding = new GroupEncodingSet({
+*     'strokeForeground': new Value({
+*         'value': true
+*     })
+* });
+*
+* var v = encoding.strokeForeground;
+* // returns <Value>
+*/
+setReadWriteAccessor( GroupEncodingSet.prototype, 'strokeForeground', getStrokeForeground, setStrokeForeground );
+
+/**
+* Encoding specifying an offset (in pixels) at which to draw the group stroke and fill.
+*
+* @name strokeOffset
+* @memberof GroupEncodingSet.prototype
+* @type {(Value|void)}
+*
+* @example
+* var Value = require( '@stdlib/plot/vega/value/ctor' );
+*
+* var encoding = new GroupEncodingSet({
+*     'strokeOffset': new Value({
+*         'value': 1
+*     })
+* });
+*
+* var v = encoding.strokeOffset;
+* // returns <Value>
+*/
+setReadWriteAccessor( GroupEncodingSet.prototype, 'strokeOffset', getStrokeOffset, setStrokeOffset );
+
+
+// EXPORTS //
+
+module.exports = GroupEncodingSet;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/properties.json b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/properties.json
new file mode 100644
index 000000000000..c1631e9d1496
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/properties.json
@@ -0,0 +1,37 @@
+[
+  "aria",
+  "blend",
+  "cursor",
+  "description",
+  "fill",
+  "fillOpacity",
+  "height",
+  "href",
+  "opacity",
+  "stroke",
+  "strokeCap",
+  "strokeDash",
+  "strokeDashOffset",
+  "strokeJoin",
+  "strokeMiterLimit",
+  "strokeOpacity",
+  "strokeWidth",
+  "tooltip",
+  "width",
+  "x",
+  "x2",
+  "xc",
+  "y",
+  "y2",
+  "yc",
+  "zindex",
+
+  "clip",
+  "cornerRadius",
+  "cornerRadiusBottomLeft",
+  "cornerRadiusBottomRight",
+  "cornerRadiusTopLeft",
+  "cornerRadiusTopRight",
+  "strokeForeground",
+  "strokeOffset"
+]
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/properties/get.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/properties/get.js
new file mode 100644
index 000000000000..f3cbb28454ea
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/properties/get.js
@@ -0,0 +1,41 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+'use strict';
+
+// MODULES //
+
+var properties = require( './../properties.json' );
+
+
+// MAIN //
+
+/**
+* Returns the list of enumerable properties.
+*
+* @private
+* @returns {Array<string>} properties
+*/
+function get() {
+	return properties.slice();
+}
+
+
+// EXPORTS //
+
+module.exports = get;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/stroke-foreground/get.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/stroke-foreground/get.js
new file mode 100644
index 000000000000..27a60427cd27
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/stroke-foreground/get.js
@@ -0,0 +1,43 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+/* eslint-disable no-invalid-this */
+
+'use strict';
+
+// MODULES //
+
+var prop = require( './properties.js' );
+
+
+// MAIN //
+
+/**
+* Returns a value reference specifying a flag indicating whether the group stroke should be drawn on top of group content.
+*
+* @private
+* @returns {(Value|void)} value reference
+*/
+function get() {
+	return this[ prop.private ];
+}
+
+
+// EXPORTS //
+
+module.exports = get;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/stroke-foreground/properties.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/stroke-foreground/properties.js
new file mode 100644
index 000000000000..1ed36938033e
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/stroke-foreground/properties.js
@@ -0,0 +1,33 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+'use strict';
+
+// MODULES //
+
+var property2object = require( '@stdlib/plot/vega/base/property2object' );
+
+
+// MAIN //
+
+var obj = property2object( 'strokeForeground' );
+
+
+// EXPORTS //
+
+module.exports = obj;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/stroke-foreground/set.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/stroke-foreground/set.js
new file mode 100644
index 000000000000..115218fe06f2
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/stroke-foreground/set.js
@@ -0,0 +1,66 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+/* eslint-disable no-invalid-this */
+
+'use strict';
+
+// MODULES //
+
+var logger = require( 'debug' );
+var isValueReference = require( '@stdlib/plot/vega/base/assert/is-value-reference' );
+var isUndefined = require( '@stdlib/assert/is-undefined' );
+var format = require( '@stdlib/string/format' );
+var changeEvent = require( './../change_event.js' );
+var prop = require( './properties.js' );
+
+
+// VARIABLES //
+
+var debug = logger( 'vega:mark:group:encoding-set:set:'+prop.name );
+
+
+// MAIN //
+
+/**
+* Sets a flag indicating whether the group stroke should be drawn on top of group content.
+*
+* ## Notes
+*
+* -   Providing `undefined` "unsets" the configured value.
+*
+* @private
+* @param {(Value|void)} value - input value
+* @throws {TypeError} must be a value reference
+* @returns {void}
+*/
+function set( value ) {
+	if ( !isValueReference( value ) && !isUndefined( value ) ) {
+		throw new TypeError( format( 'invalid assignment. `%s` must be a value reference. Value: `%s`.', prop.name, value ) );
+	}
+	if ( value !== this[ prop.private ] ) {
+		debug( 'Current value: %s. New value: %s.', this[ prop.private ], value );
+		this[ prop.private ] = value;
+		this.emit( 'change', changeEvent( prop.name ) );
+	}
+}
+
+
+// EXPORTS //
+
+module.exports = set;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/stroke-offset/get.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/stroke-offset/get.js
new file mode 100644
index 000000000000..abe8dc4ccf8b
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/stroke-offset/get.js
@@ -0,0 +1,43 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+/* eslint-disable no-invalid-this */
+
+'use strict';
+
+// MODULES //
+
+var prop = require( './properties.js' );
+
+
+// MAIN //
+
+/**
+* Returns a value reference specifying an offset (in pixels) at which to draw the group stroke and fill.
+*
+* @private
+* @returns {(Value|void)} value reference
+*/
+function get() {
+	return this[ prop.private ];
+}
+
+
+// EXPORTS //
+
+module.exports = get;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/stroke-offset/properties.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/stroke-offset/properties.js
new file mode 100644
index 000000000000..ad13653a4a1b
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/stroke-offset/properties.js
@@ -0,0 +1,33 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+'use strict';
+
+// MODULES //
+
+var property2object = require( '@stdlib/plot/vega/base/property2object' );
+
+
+// MAIN //
+
+var obj = property2object( 'strokeOffset' );
+
+
+// EXPORTS //
+
+module.exports = obj;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/stroke-offset/set.js b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/stroke-offset/set.js
new file mode 100644
index 000000000000..1ece039bb8c3
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/lib/stroke-offset/set.js
@@ -0,0 +1,66 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* 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.
+*/
+
+/* eslint-disable no-invalid-this */
+
+'use strict';
+
+// MODULES //
+
+var logger = require( 'debug' );
+var isValueReference = require( '@stdlib/plot/vega/base/assert/is-value-reference' );
+var isUndefined = require( '@stdlib/assert/is-undefined' );
+var format = require( '@stdlib/string/format' );
+var changeEvent = require( './../change_event.js' );
+var prop = require( './properties.js' );
+
+
+// VARIABLES //
+
+var debug = logger( 'vega:mark:group:encoding-set:set:'+prop.name );
+
+
+// MAIN //
+
+/**
+* Sets an offset (in pixels) at which to draw the group stroke and fill.
+*
+* ## Notes
+*
+* -   Providing `undefined` "unsets" the configured value.
+*
+* @private
+* @param {(Value|void)} value - input value
+* @throws {TypeError} must be a value reference
+* @returns {void}
+*/
+function set( value ) {
+	if ( !isValueReference( value ) && !isUndefined( value ) ) {
+		throw new TypeError( format( 'invalid assignment. `%s` must be a value reference. Value: `%s`.', prop.name, value ) );
+	}
+	if ( value !== this[ prop.private ] ) {
+		debug( 'Current value: %s. New value: %s.', this[ prop.private ], value );
+		this[ prop.private ] = value;
+		this.emit( 'change', changeEvent( prop.name ) );
+	}
+}
+
+
+// EXPORTS //
+
+module.exports = set;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/package.json b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/package.json
new file mode 100644
index 000000000000..9bb29e3c2cba
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/group/encoding-set/package.json
@@ -0,0 +1,62 @@
+{
+  "name": "@stdlib/plot/vega/mark/group/encoding-set",
+  "version": "0.0.0",
+  "description": "Group mark encoding set constructor.",
+  "license": "Apache-2.0",
+  "author": {
+    "name": "The Stdlib Authors",
+    "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+  },
+  "contributors": [
+    {
+      "name": "The Stdlib Authors",
+      "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+    }
+  ],
+  "main": "./lib",
+  "directories": {
+    "benchmark": "./benchmark",
+    "doc": "./docs",
+    "example": "./examples",
+    "lib": "./lib",
+    "test": "./test"
+  },
+  "types": "./docs/types",
+  "scripts": {},
+  "homepage": "https://github.com/stdlib-js/stdlib",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/stdlib-js/stdlib.git"
+  },
+  "bugs": {
+    "url": "https://github.com/stdlib-js/stdlib/issues"
+  },
+  "dependencies": {},
+  "devDependencies": {},
+  "engines": {
+    "node": ">=0.10.0",
+    "npm": ">2.7.0"
+  },
+  "os": [
+    "aix",
+    "darwin",
+    "freebsd",
+    "linux",
+    "macos",
+    "openbsd",
+    "sunos",
+    "win32",
+    "windows"
+  ],
+  "keywords": [
+    "stdlib",
+    "plot",
+    "vega",
+    "group",
+    "mark",
+    "encoding",
+    "constructor",
+    "ctor"
+  ],
+  "__stdlib__": {}
+}