allow vendord

vendor/sabberworm/php-css-parser/src/CSSElement.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Sabberworm\CSS;
+
+/**
+ * Represents any entity in the CSS that is encapsulated by a class.
+ *
+ * Its primary purpose is to provide a type for use with `Document::getAllValues()`
+ * when a subset of values from a particular part of the document is required.
+ *
+ * Thus, elements which don't contain `Value`s (such as statement at-rules) don't need to implement this.
+ *
+ * It extends `Renderable` because every element is renderable.
+ */
+interface CSSElement extends Renderable {}