/** * Пассивные прослушиватели событий не используются для улучшения производительности при прокрутке (© Калинский Евгений aka seojacky (https://t.me/big_jacky)) */ add_action( 'wp_footer', 'script_passive_event_listeners', 99 ); function script_passive_event_listeners(){ ?> <script> (function() { var supportsPassive = eventListenerOptionsSupported(); if (supportsPassive) { var addEvent = EventTarget.prototype.addEventListener; overwriteAddEvent(addEvent); } function overwriteAddEvent(superMethod) { var defaultOptions = { passive: true, capture: false }; EventTarget.prototype.addEventListener = function(type, listener, options) { var usesListenerOptions = typeof options === 'object'; var useCapture = usesListenerOptions ? options.capture : options; options = usesListenerOptions ? options : {}; options.passive = options.passive !== undefined ? options.passive : defaultOptions.passive; options.capture = useCapture !== undefined ? useCapture : defaultOptions.capture; superMethod.call(this, type, listener, options); }; } function eventListenerOptionsSupported() { var supported = false; try { var opts = Object.defineProperty({}, 'passive', { get: function() { supported = true; } }); window.addEventListener("test", null, opts); } catch (e) {} return supported; } })(); </script> <?php }
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