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wp-content/plugins/jetpack-boost/compatibility/aioseo.php

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+<?php
+/**
+ * All in One SEO compatibility for Boost
+ *
+ * @package automattic/jetpack-boost
+ */
+
+namespace Automattic\Jetpack_Boost\Compatibility\AIOSEO;
+
+use Automattic\Jetpack_Boost\Jetpack_Boost;
+
+// Add the Critical CSS generation query arg to the list of allowed query args of All in One SEO.
+// This prevents All in One SEO from removing the query arg, which breaks Critical CSS generation.
+add_filter( 'aioseo_unrecognized_allowed_query_args', array( Jetpack_Boost::class, 'whitelist_query_args' ) );