'optgroup' JavaScript Properties
+----------------+--------------------------------------------------------------+
| JavaScript |className clientHeight |
| Properties |clientWidth dir |
| |firstChild id |
| |innerHTML label |
| |lang lastChild |
| |nextSibling nodeName |
| |nodeType nodeValue |
| |offsetHeight offsetLeft |
| |offsetParent offsetTop |
| |offsetWidth ownerDocument |
| |parentNode previousSibling |
| |scrollHeight scrollLeft |
| |scrollTop scrollWidth |
| |tagName title |
+----------------+--------------------------------------------------------------+
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