* legend 要素型 (HTML, XHTML 1)

[1] [DFN[[CODE(HTMLe)[legnend]]]] は、 [CODE(HTMLe)[[[fieldset]]]]
に[RUBYB[題] [caption]]を割当てます。

[2] 仕様書:
- [[HTML 4]] ([[Web Forms 1.0]])
-- [CITE[17.10 Adding structure to forms: the [CODE(HTMLe)[FIELDSET]] and [CODE(HTMLe)[LEGEND]] elements]]
<IW:HTML4:"interact/forms.html#edef-LEGEND">
- [[Web Forms 2.0]]
-- [CSECTION@en[3.3. Changes to existing controls]]
<IW:WF2:"#changes">

[3]
:状態:[[W3C]] [[勧告]]
:[[名前空間URI]]:[CODE(URI)@en[[[http://www.w3.org/1999/xhtml]]]]
:[[局所名]]:[CODE(HTMLe)@en[[[legend]]]]
([Q[[RUBYB[銘] @en[legend]]]]より)
:[[開始タグ]]:必須
:[[終了タグ]]:必須
:[[内容模型]]:[CODE(SGML)[(%[[inline]])*]]
:出現できる文脈:[CODE(HTMLe)[[[fieldset]]]] の最初に1つ (必須)
:[[属性]]:
,属性名	,属性値	,既定値	,説明	,出典
,[CODE(HTMLa)[[[accesskey]]]]	,[CODE(SGML)[%[[Character]]]]	,	,	,[HTML 4]
,[CODE(HTMLa)[[[align]]]]	,	,	,配置	,[HTML 4] 非推奨
,[CODE(HTMLa)[[[class]]]]	,	,(なし)	,[[級]]	,"[HTML 4] %[[coreattrs]] ⊂ %[[attrs]], [XHTML 1] [[Core]] ⊂ [[Common]]"
,[CODE(HTMLa)[[[dir]]]]	,	,	,[[書字方向]]	,"[HTML 4] %[[i18n]] ⊂ %attrs, [XHTML 1] [[I18N]] ⊂ Common"
,[CODE(HTMLa)[[[id]]]]	,[CODE(SGML)[[[ID]]]]	,(なし)	,一意識別子	,"[HTML 4] %coreattrs ⊂ %attrs, [XHTML 1] Core ⊂ Common"
,[CODE(HTMLa)[[[lang]]]]	,	,	,[[自然言語]]	,[HTML 4] %i18n ⊂ %attrs
,[CODE(HTMLa)[[[xml]]:lang]]	,	,	,自然言語	,[XHTML 1] I18N ⊂ Common
,[CODE(HTMLa)[[[onclick]]]]	,[CODE(SGML)[%[[Script]]]]	,(なし)	,	,"[HTML 4] %[[events]] ⊂ %attrs, [XHTML 1] [[Events]] ⊂ Common"
,[CODE(HTMLa)[[[ondblclick]]]]	,[CODE(SGML)[%[[Script]]]]	,(なし)	,	,"[HTML 4] %events ⊂ %attrs, [XHTML 1] Events ⊂ Common"
,[CODE(HTMLa)[[[onkeydown]]]]	,[CODE(SGML)[%[[Script]]]]	,(なし)	,	,"[HTML 4] %events ⊂ %attrs, [XHTML 1] Events ⊂ Common"
,[CODE(HTMLa)[[[onkeypress]]]]	,[CODE(SGML)[%[[Script]]]]	,(なし)	,	,"[HTML 4] %events ⊂ %attrs, [XHTML 1] Events ⊂ Common"
,[CODE(HTMLa)[[[onkeyup]]]]	,[CODE(SGML)[%[[Script]]]]	,(なし)	,	,"[HTML 4] %events ⊂ %attrs, [XHTML 1] Events ⊂ Common"
,[CODE(HTMLa)[[[onmousedown]]]]	,[CODE(SGML)[%[[Script]]]]	,(なし)	,	,"[HTML 4] %events ⊂ %attrs, [XHTML 1] Events ⊂ Common"
,[CODE(HTMLa)[[[onmousemove]]]]	,[CODE(SGML)[%[[Script]]]]	,(なし)	,	,"[HTML 4] %events ⊂ %attrs, [XHTML 1] Events ⊂ Common"
,[CODE(HTMLa)[[[onmouseout]]]]	,[CODE(SGML)[%[[Script]]]]	,(なし)	,	,"[HTML 4] %events ⊂ %attrs, [XHTML 1] Events ⊂ Common"
,[CODE(HTMLa)[[[onmouseover]]]]	,[CODE(SGML)[%[[Script]]]]	,(なし)	,	,"[HTML 4] %events ⊂ %attrs, [XHTML 1] Events ⊂ Common"
,[CODE(HTMLa)[[[onmouseup]]]]	,[CODE(SGML)[%[[Script]]]]	,(なし)	,	,"[HTML 4] %events ⊂ %attrs, [XHTML 1] Events ⊂ Common"
,[CODE(HTMLa)[[[style]]]]	,	,	,スタイル情報	,"[HTML 4] %coreattrs ⊂ %attrs, [XHTML 1] [[Style]] ⊂ Common"
,[CODE(HTMLa)[[[title]]]]	,	,	,注釈的題	,"[HTML 4] %coreattrs ⊂ %attrs, [XHTML 1] Core ⊂ Common"


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[[#comment]]


** 内容モデル

[6]
[[Web Forms 2.0]] のメモ <IW:WF2:"#emptyElements">
によれば、 [[HTML 4]] では [CODE(HTMLe)@en[[[legend]]]]
は最低1[[文字]]の[[内容]]が必要だとされています。

これは [[HTML 4]] のどの部分が根拠でしょうか?

[7]
[[Web Forms 2.0]] では、 [CODE(HTMLe)@en[[[legend]]]]
[[要素]]は[[空]]に[['''して構いません''']]。
しかし、[[利用者]]の混乱を防ぐため、
[[空]]かつ可視な状態は避けるように[['''するべきです''']]。
[SRC@en[WF2 2.3]]

[[#comment]]


** アクセス可能性

[4] [CODE(HTMLe)[legend]] は非視覚レンダリングでのアクセス可能性を高めます 
[SRC[HTML 4 17.10]]。

[[#comment]]


** 関連

[5]
[CODE(HTMLe)@en[[[fieldset]]]] [[要素]]に対する
[CODE(HTMLe)@en[[[legend]]]] [[要素]]は、
- [[フォーム制御子]]に対する [CODE(HTMLe)@en[[[label]]]] [[要素]]
- [CODE(HTMLe)@en[[[table]]]] [[要素]]に対する
[CODE(HTMLe)@en[[[caption]]]] [[要素]]
- [CODE(HTMLe)@en[[[section]]]] 系[[要素]]に対する
[CODE(HTMLe)@en[[[h[VAR[n]]]]]] [[要素]]や
[CODE(HTMLe)@en[[[header]]]] [[要素]]
- [CODE(HTMLe)@en[[[html]]]] [[要素]]に対する
[CODE(HTMLe)@en[[[title]]]] [[要素]]
- [CODE(XMLe)@en[[VAR[xhtml2:]][[nl]]]] 系[[要素]]に対する
[CODE(XMLe)@en[[VAR[xhtml2:]][[label]]]] [[要素]]

と同じような関係にあります。

[[#comment]]


** メモ

[[#comment]]


* メモ