in the "Groups" example, there is an <li/> nested inside an <li/> with no list element in between. is this valid markup? <ul class="main"> <li class="mai

in the "Groups" example, there is an <li/> nested inside an <li/> with no list element in between. is this valid markup? <ul class="main"> <li class="main"> <details> <summary>File</summary> <div class="options"> <fieldset> <li class="sub"><a href="/open">Open</a></li> </fieldset> </div> </details> </li> </ul> i would think that an <li/> must be the direct child of an ol, ul, or menu.