createTHead method
The createTHead() method of
HTMLTableElement objects returns the thead element
associated with a given table. If no header exists in the table, this
method creates it, and then returns it.
Note: If no header exists,
createTHead()inserts a new header directly into the table. The header does not need to be added separately as would be the case if Document.createElement had been used to create the new<thead>element.
Implementation
external HTMLTableSectionElement createTHead();