WICKET-5531 Create new placeholder tag to indicate where header contributions should appear
WICKET-5531 Create new placeholder tag to indicate where header contributions should appear
Fix copy/paste error
Improve the javadoc of HtmlHeaderItemsContainer
WICKET-5531 Create new placeholder tag to indicate where header contributions should appear
WICKET-5531 Create new placeholder tag to indicate where header contributions should appear

Remove a method that is no more needed.
The addition of the closing tag for <wicket:header-items/> is now done in OpenCloseTagExpander
WICKET-5531 Create new placeholder tag to indicate where header contributions should appear

Remove the usage of the tag namespace when checking where the tag should be transformed from openClose to open+close.
The namespace is dynamic (it depends) on the xmlns: for the page. We cannot hardcode namespaces in the list of tags to expand
WICKET-5531 Create new placeholder tag to indicate where header contributions should appear

extend HtmlHeaderSectionHandler javadoc to mention <wicket:header-items/>
Use tabs, as in the rest of the file