<?php
namespace MailPoetVendor\Sabberworm\CSS\Property;
if (!defined('ABSPATH')) exit;
class KeyframeSelector extends Selector
{
const SELECTOR_VALIDATION_RX = '/
^(
(?:
[a-zA-Z0-9\\x{00A0}-\\x{FFFF}_^$|*="\'~\\[\\]()\\-\\s\\.:#+>]* # any sequence of valid unescaped characters
(?:\\\\.)? # a single escaped character
(?:([\'"]).*?(?<!\\\\)\\2)? # a quoted text like [id="example"]
)*
)|
(\\d+%) # keyframe animation progress percentage (e.g. 50%)
$
/ux';
}