(function (doc) { var id = '__CHATUI_ICONS__'; var svgSprite = ''; if (!doc) return; function ready(fn) { if (document.readyState === 'loading') { document.addEventListener('DOMContentLoaded', fn); } else { fn(); } } function appendSvg() { doc.body.insertAdjacentHTML('afterbegin', svgSprite); } var existing = doc.getElementById(id); if (!existing) { ready(appendSvg); } })(document);