#23742 Add Header (h1 - h6) tags to layout xml htmlTags Allowed types

Add article as allowed html tag

Author: ihor-sviziev

lib/internal/Magento/Framework/View/Layout/etc/elements.xsd

@@ -140,6 +140,7 @@
             <xs:enumeration value="table"/>
             <xs:enumeration value="tfoot"/>
             <xs:enumeration value="ul"/>
+            <xs:enumeration value="article"/>
             <xs:enumeration value="h1"/>
             <xs:enumeration value="h2"/>
             <xs:enumeration value="h3"/>