@schukai/monster/source/components/stylesheet/accessibility.mjs

Monster is a simple library for creating fast, robust and lightweight websites.

/**
 * Copyright © Volker Schukai and all contributing authors, 2026. All rights reserved.
 * Node module: @schukai/monster
 *
 * This source code is licensed under the GNU Affero General Public License version 3 (AGPLv3).
 * The full text of the license can be found at: https://www.gnu.org/licenses/agpl-3.0.en.html
 *
 * For those who do not wish to adhere to the AGPLv3, a commercial license is available.
 * Acquiring a commercial license allows you to use this software without complying with the AGPLv3 terms.
 * For more information about purchasing a commercial license, please contact Volker Schukai.
 */

import { addAttributeToken } from "../../dom/attributes.mjs";
import { ATTRIBUTE_ERRORMESSAGE } from "../../dom/constants.mjs";

export { AccessibilityStyleSheet };

/**
 * @private
 * @type {CSSStyleSheet}
 */
const AccessibilityStyleSheet = new CSSStyleSheet();

try {
	AccessibilityStyleSheet.insertRule(
		`
@layer accessibility { 
.visually-hidden{height:1px!important;margin:-1px!important;overflow:hidden!important;padding:0!important;width:1px!important;clip:rect(0,0,0,0)!important;border:0!important;white-space:nowrap!important}.visually-hidden:not(caption){position:absolute!important}.visually-hidden-focusable:not(:focus):not(:focus-within){height:1px!important;margin:-1px!important;overflow:hidden!important;padding:0!important;width:1px!important;clip:rect(0,0,0,0)!important;border:0!important;white-space:nowrap!important}.visually-hidden-focusable:not(:focus):not(:focus-within):not(caption){position:absolute!important}@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}} 
}`,
		0,
	);
} catch (e) {
	addAttributeToken(
		document.getRootNode().querySelector("html"),
		ATTRIBUTE_ERRORMESSAGE,
		e + "",
	);
}