3.17 - Identify unwanted body modification from DOMDocument to bail out early

I tried this approach with a quick prototype. It bails out almost on every page on e2e websites, there is always a small change so I think this approach is too broad:

    public function add_hashes( $html ) {

        // Find the body before DOMDocument processing
        $result = preg_match( '/(?><body[^>]*>)(?>.*?<\/body>)/is', $html, $matches );

        if ( ! $result ) {
            Logger::error( 'Body element not found in the HTML content.', [ 'LazyRenderContent' ] );

            return $html;
        }

        $body_before = $matches[0];

        $internal_errors = libxml_use_internal_errors( true );

        // Load HTML into DOMDocument.
        $dom = new DOMDocument();

        if ( ! $dom->loadHTML( $html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD ) ) {
            foreach ( libxml_get_errors() as $error ) {
                Logger::error( $error->message, [ 'LazyRenderContent' ] );
            }

            libxml_clear_errors();

            return $html;
        }

        libxml_use_internal_errors( $internal_errors );

        // Find the body after DOMDocument processing
        $html_parsed = $dom->saveHTML();
        $result = preg_match( '/(?><body[^>]*>)(?>.*?<\/body>)/is', $html_parsed, $matches );

        if ( ! $result ) {
            Logger::error( 'Body element not found in the HTML DOMDocument parsed content.', [ 'LazyRenderContent' ] );

            return $html;
        }

        $body_after = $matches[0];

        if ( $body_before !== $body_after ) {
            Logger::error( 'Body element has unwanted modifications from DOMDocument.', [ 'LazyRenderContent' ] );

            error_log('Body element has unwanted modifications from DOMDocument.');
            error_log($body_before);
            error_log($body_after);

            return $html;
        }

        // Now, DOMDocument usage is safe
        // Get the body element in DOMDocument and inject hashed recursively
        $body = $dom->getElementsByTagName( 'body' )->item( 0 );

        if ( ! $body ) {
            Logger::error( 'Body element not found in the DOMDocument content.', [ 'LazyRenderContent' ] );

            return $html;
        }

        $this->add_hash_to_element( $body, $this->get_depth() );

        // Extract the body from DOMDocument
        $html_processed = $dom->saveHTML();
        $result = preg_match( '/(?><body[^>]*>)(?>.*?<\/body>)/is', $html_processed, $matches );

        if ( ! $result ) {
            Logger::error( 'Body element not found in the HTML DOMDocument processed content.', [ 'LazyRenderContent' ] );

            return $html;
        }

        $body_processed = $matches[0];

        // Inject the manipulated body into the original HTML
        $result = preg_replace( '/(?><body[^>]*>)(?>.*?<\/body>)/is', $body_processed, $html );

        if ( ! $result ) {
            Logger::error( 'Body element not found in the HTML content when trying to replace.', [ 'LazyRenderContent' ] );

            return $html;
        }

        return $html;
    }

wp-media / wp-rocket

3.17 - Identify unwanted body modification from DOMDocument to bail out early #6952