the current editor's draft specifies (in 2.2.2) that support for CDATASection interface is required as defined in [DOMCORE] (aka DOM4);

however, [DOMCORE] does not define support for CDATASection and has marked it (in 11.2) as having been 'removed to simplify the DOM platform'; note also that the Document interface defined in [DOMCORE] 5.3 does not define the createCDATASection() method that was included in DOM-[23] Core;

since HTML5 does in fact make numerous normative uses of CDATA and CDATASection nodes, i would suggest that [DOMCORE] (DOM4) be modified to restore support for CDATASection nodes and the Document.createCDATASection() method;