Editing Module:Buffer/doc (section)

======args.tag<sup>[[#endnote_skip1|†]]</sup>======
{{code|lang=lua|1=Element{{ndash}}Buffer:_add{ tag = tagName } }}

{{code|lang=lua|1=Element{{ndash}}Buffer:_add{ tag = { tagName, args{{ndash}}list } } }}

Set the key <code>args.tag</code> to a string and this calls {{luaref|mw.html.create||y}} with it as the ''tagName'' argument. This then raw inserts the returned mw.html object ("tag"), emulating the effect of {{luaref|mw.html:tag||y}} minus parent references, which are unnecessary.

Pair the ''args.tag'' key with a table value and this calls mw.html.create with {{code|lang=lua|table[1]}} as ''tagName'' (or nil if [[#invalid]]), appending it as described above for string values, but also pointing <code>tag.parent</code> to the [[#Buffer-HTML|Element-Buffer's parent]] as well as temporarily setting the tag as the parent Buffer of <code>tag.nodes</code>. This then treats tag.nodes as a ''[[pseudo]]-''Element-Buffer, [[Recursion (computer science)|recursing]] tag.nodes as "self" and the table as ''args'', though only iterating keys not equal to {{code|lang=lua|1}} (or less).[[#endnote_skip1-tag|<sup>[*]</sup>]]

Note this appends normal mw.html objects. That said, most Buffer functions named in ''args-list'' should still work as though the tag and <code>tag.nodes</code> were Buffer objects.<ref group="note">However, some Buffer methods may not work properly after appending objects via mw.html functions to the pseudo-Buffer.<br/>For example, {{code|lang=lua|1={ tag = {'div', 'List:', foo1, foo2, foo3, _out = { 0, '\n*' } } } }} could produce a div with each ''foo'' as [[Bullet_(typography)|bulleted]] item. But, if ''foo1'' were {{code|lang=lua|1={ tag = { 'b', 'text' } } }}, then {{luaself|:_out|plain=y}} may fail when appending {{luaref|table.concat||y}} with the non-string/number element. A workaround is to add the pair {{code|lang=lua|1=_ = {true, true} }} to set [[#raw|raw mode]] on the div's tag.nodes; another is to replace ''foo1'' with {{code|lang=lua|mw.html.create'b':wikitext'text'}}, which appends in string form.</ref>

Upon completing a recursive iteration for args.tag, this checks if the tag is selfClosing, in which case, this sets tag.nodes to nil. Likewise, if its tagName property evaluates false, this nils tag.styles and tag.attributes. Such presumes those properties will not be modified afterwards, so use mw.html:tag outside of Element-Buffer:_add if such is not the case.

{{anchor|args.done}}