Rename selectedcontent "disabled" to "in valid tree position", inverting the value#12369

keithamus wants to merge 4 commits intowhatwg:mainwhatwg/html:mainfrom

keithamus:rename-selectedcontent-disabled-to-in-valid-tree-position-inverting-the-valuekeithamus/html:rename-selectedcontent-disabled-to-in-valid-tree-position-inverting-the-valueCopy head branch name to clipboard