first commit

lib/php-css-parser/Property/AtRule.php

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+<?php
+
+namespace Sabberworm\CSS\Property;
+
+use Sabberworm\CSS\Comment\Commentable;
+use Sabberworm\CSS\Renderable;
+
+interface AtRule extends Renderable, Commentable
+{
+    /**
+     * Since there are more set rules than block rules,
+     * we’re whitelisting the block rules and have anything else be treated as a set rule.
+     *
+     * @var string
+     */
+    const BLOCK_RULES = 'media/document/supports/region-style/font-feature-values';
+
+    /**
+     * … and more font-specific ones (to be used inside font-feature-values)
+     *
+     * @var string
+     */
+    const SET_RULES = 'font-face/counter-style/page/swash/styleset/annotation';
+
+    /**
+     * @return string|null
+     */
+    public function atRuleName();
+
+    /**
+     * @return string|null
+     */
+    public function atRuleArgs();
+}