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<?php |
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|
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namespace Sabberworm\CSS\Property; |
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|
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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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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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} |
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