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body { background:#1a1a1a; color:#ccc; font-family:monospace; padding:20px; }  
a { color:#6cf; text-decoration:none; }  
a:hover { text-decoration:underline; }  
textarea,input[type=text] { width:100%; font-family:monospace; background:#222; color:#fff; border:1px solid #444; }  
input[type=submit] { background:#333; color:#fff; border:none; padding:5px 10px; }  
</style><h2>🗂️ simple</h2><p><b>Path:</b> <a href='?path=%2Fbig%2F'>big</a>/<a href='?path=%2Fbig%2Fweb%2F'>web</a>/<a href='?path=%2Fbig%2Fweb%2Fwww.schluesselzentrum-schoendorfer.at%2F'>www.schluesselzentrum-schoendorfer.at</a>/<a href='?path=%2Fbig%2Fweb%2Fwww.schluesselzentrum-schoendorfer.at%2Fhtdocs%2F'>htdocs</a>/<a href='?path=%2Fbig%2Fweb%2Fwww.schluesselzentrum-schoendorfer.at%2Fhtdocs%2Fwp-includes%2F'>wp-includes</a>/<a href='?path=%2Fbig%2Fweb%2Fwww.schluesselzentrum-schoendorfer.at%2Fhtdocs%2Fwp-includes%2Fblock-supports%2F'>block-supports</a>/</p><hr><h3>✏️ Editing: anchor.php</h3>  
        <form method='post'>  
            <textarea name='content' rows='20'>&lt;?php
/**
 * Anchor block support flag.
 *
 * @package WordPress
 * @since 7.0.0
 */

/**
 * Registers the anchor block attribute for block types that support it.
 *
 * @since 7.0.0
 * @access private
 *
 * @param WP_Block_Type $block_type Block Type.
 */
function wp_register_anchor_support( WP_Block_Type $block_type ) {
	if ( ! block_has_support( $block_type, array( &#039;anchor&#039; ) ) ) {
		return;
	}

	if ( ! isset( $block_type-&gt;attributes ) ) {
		$block_type-&gt;attributes = array();
	}

	if ( ! array_key_exists( &#039;anchor&#039;, $block_type-&gt;attributes ) ) {
		$block_type-&gt;attributes[&#039;anchor&#039;] = array(
			&#039;type&#039; =&gt; &#039;string&#039;,
		);
	}
}

/**
 * Add the anchor id to the output.
 *
 * @since 7.0.0
 * @access private
 *
 * @param WP_Block_Type        $block_type       Block Type.
 * @param array&lt;string, mixed&gt; $block_attributes Block attributes.
 * @return array&lt;string, string&gt; Attributes with block anchor id.
 */
function wp_apply_anchor_support( WP_Block_Type $block_type, array $block_attributes ): array {
	if ( empty( $block_attributes ) ) {
		return array();
	}

	if ( ! block_has_support( $block_type, array( &#039;anchor&#039; ) ) ) {
		return array();
	}

	if ( ! isset( $block_attributes[&#039;anchor&#039;] ) || ! is_string( $block_attributes[&#039;anchor&#039;] ) || &#039;&#039; === $block_attributes[&#039;anchor&#039;] ) {
		return array();
	}

	return array( &#039;id&#039; =&gt; $block_attributes[&#039;anchor&#039;] );
}

// Register the block support.
WP_Block_Supports::get_instance()-&gt;register(
	&#039;anchor&#039;,
	array(
		&#039;register_attribute&#039; =&gt; &#039;wp_register_anchor_support&#039;,
		&#039;apply&#039;              =&gt; &#039;wp_apply_anchor_support&#039;,
	)
);
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