feat: add background support

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---

Author: kgryte

lib/node_modules/@stdlib/plot/vega/visualization/lib/background/get.js

@@ -0,0 +1,38 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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';
+
+// MAIN //
+
+/**
+* Returns the visualization background color.
+*
+* @private
+* @returns {string} background color
+*/
+function get() {
+	return this._background;
+}
+
+
+// EXPORTS //
+
+module.exports = get;

lib/node_modules/@stdlib/plot/vega/visualization/lib/background/set.js

@@ -0,0 +1,59 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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 isString = require( '@stdlib/assert/is-string' ).isPrimitive;
+var format = require( '@stdlib/string/format' );
+
+
+// VARIABLES //
+
+var debug = logger( 'vega:visualization:set:background' );
+
+
+// MAIN //
+
+/**
+* Sets the visualization background color.
+*
+* @private
+* @param {string} value - input value
+* @throws {TypeError} must be a string
+* @returns {void}
+*/
+function set( value ) {
+	if ( !isString( value ) ) {
+		throw new TypeError( format( 'invalid assignment. `%s` must be a string. Value: `%s`.', 'background', value ) );
+	}
+	if ( value !== this._background ) {
+		debug( 'Current value: %s. New value: %s.', this._background, value );
+		this._background = value;
+		this.emit( 'change' );
+	}
+}
+
+
+// EXPORTS //
+
+module.exports = set;

lib/node_modules/@stdlib/plot/vega/visualization/lib/defaults.js

@@ -48,6 +48,8 @@ function defaults() {
 		// Coordinate axes:
 		'axes': [],
 
+		'background': '',
+
 		// Visualization theme:
 		'config': {},
 

lib/node_modules/@stdlib/plot/vega/visualization/lib/main.js

@@ -43,6 +43,9 @@ var setAutosize = require( './autosize/set.js' );
 var getAxes = require( './axes/get.js' );
 var setAxes = require( './axes/set.js' );
 
+var getBackground = require( './background/get.js' );
+var setBackground = require( './background/set.js' );
+
 var getConfig = require( './config/get.js' );
 var setConfig = require( './config/set.js' );
 
@@ -338,6 +341,24 @@ setReadWriteAccessor( Visualization.prototype, 'autosize', getAutosize, setAutos
 */
 setReadWriteAccessor( Visualization.prototype, 'axes', getAxes, setAxes );
 
+/**
+* Visualization background color.
+*
+* @name background
+* @memberof Visualization.prototype
+* @type {string}
+* @default ''
+*
+* @example
+* var viz = new Visualization({
+*     'background': 'white'
+* });
+*
+* var v = viz.background;
+* // returns 'white'
+*/
+setReadWriteAccessor( Visualization.prototype, 'background', getBackground, setBackground );
+
 /**
 * Visualization theme.
 *