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1441 ariadna 1 
<?php
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namespace Sabberworm\CSS\Property;
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class KeyframeSelector extends Selector
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{
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    /**
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     * regexp for specificity calculations
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     *
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     * @var string
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     *
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     * @internal since 8.5.2
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     */
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    const SELECTOR_VALIDATION_RX = '/
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    ^(
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        (?:
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            [a-zA-Z0-9\x{00A0}-\x{FFFF}_^$|*="\'~\[\]()\-\s\.:#+>]* # any sequence of valid unescaped characters
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            (?:\\\\.)?                                              # a single escaped character
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            (?:([\'"]).*?(?<!\\\\)\2)?                              # a quoted text like [id="example"]
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        )*
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    )|
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    (\d+%)                                                          # keyframe animation progress percentage (e.g. 50%)
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    $
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    /ux';
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}