24     protected string $zoom = ''; // optional scaling factor  variable in syntax_plugin_bpmnio_bpmnio
70                 $this->zoom = $this->normalizeZoom($attrs['zoom'] ?? null) ?? '';
72                 return [$state, $this->type, '', $pos, '', false, $this->zoom];
82 …     return [$state, $this->type, base64_encode($match), $posStart, $posEnd, $inline, $this->zoom];
87                 $this->zoom = '';
103     private function normalizeZoom($zoom): ?string  argument
105         if ($zoom === null || $zoom === '') {
109         if (!is_numeric($zoom)) {
113         $zoom = (float) $zoom;
114         if ($zoom <= 0) {
118         return rtrim(rtrim(number_format($zoom, 4, '.', ''), '0'), '.');
140         [$state, $type, $match, $posStart, $posEnd, $inline, $zoom] = array_pad($data, 7, '');
189                     $zoomAttr = $zoom !== '' ? " data-zoom=\"{$zoom}\"" : '';