* 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]] - [[Web Forms 2.0]] -- [CSECTION@en[3.3. Changes to existing controls]] [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)@en[[[form]]]],,,廃止,[DEL[[[Web Applications 1.0]]]] ,[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" ** 内容モデル [6] [[Web Forms 2.0]] のメモ 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。 * 歴史 ** HTML4 [30] [CITE[Design Issues for HTML Forms]], [TIME[1999-02-04T17:41:10.000Z]], [TIME[2024-08-25T03:32:27.452Z]] [FIG(data)[ [216] [[HTML要素概説]] :[F[要素名]]:[CODE[is]] :日付:[TIME[1995-03-08]] :説明: [TIME[1996-03-08]]付 [[W3C]] 文書で [CODE[is]] が提案されていた。 現在の [CODE[legend]] に近いが、 ラベルと内容を区切るものだった。 :出典: [REFS[ - [CITE[Design Issues for HTML Forms]], [DATA(.author)[[[W3C]]]], [DATA(.status)[[[Working Draft]]]], [TIME(.published)[08-Mar-96][1996-03-08]], [TIME[1999-02-04T17:41:10.000Z]], [TIME[2024-08-25T03:33:02.026Z]] ]REFS] ]FIG] [32] [[Cougar]] では [CODE[caption]] が使われていました。 [CITE[HTML 4.0]] になって [CODE[legend]] になりました。 [SEE[ [[fieldset]] ]] ** HTML5 [31] [CITE@en[the legend element (if anyone has a better idea of how to classify th…]], [[Hixie]], [TIME[2006-11-26 15:29:44 +09:00]], [TIME[2024-09-01T12:25:41.000Z]] [FIG(data)[ [48] [[HTML要素概説]] :[F[要素名]]:[CODE[legend]] :日付:[TIME[2006-11-26]] :説明: [TIME[2006-11-26]]、 [CITE[HTML5]] は [CODE[legend]] を定義した。 現行仕様である。 :出典: [REFS[ - [CITE[HTML5 r363]], [DATA(.author)[[[Hixie]]]], [TIME(.published)[2006-11-26 15:29:44 +09:00]], [TIME[2024-09-01T12:25:41.000Z]] ]REFS] :参照:[CODE[summary]] :参照:[CODE[figcaption]] :参照:[CODE[dt]] ]FIG] [77] [CITE@en[(X)HTML5 Tracking]] ([TIME[2009-10-12 19:07:38 +09:00]] 版) [78] [CITE[IRC logs: freenode / #whatwg / 20090903]] ([TIME[2009-10-17 12:08:54 +09:00]] 版) [79] [CITE[IRC logs: freenode / #whatwg / 20100211]] ([TIME[2010-02-13 15:54:31 +09:00]] 版) [80] [CITE@en[Web Applications 1.0 r5504 make the legend rendering requirements only apply when they make senseFixing http://www.w3.org/Bugs/Public/show_bug.cgi?id=10547]] ( ([TIME[2010-09-26 09:52:00 +09:00]] 版)) [81] [CITE@en[Web Applications 1.0 r7987 Make styles match reality.]] ( ([TIME[2013-06-19 07:37:00 +09:00]] 版)) [8] [CITE@en[Editorial: Cross-reference DOM "child" where appropriate in rendering]] ([[zcorpan]]著, [TIME[2016-09-20 20:16:41 +09:00]]) [9] [CITE@en[The "rendered legend" creates a new block formatting context]] ([[zcorpan]]著, [TIME[2017-06-07 21:30:20 +09:00]]) [10] [CITE@en[Refer to a fieldset's legend as a caption to reduce confusion]] ([[zcorpan]]著, [TIME[2018-08-21 19:16:49 +09:00]]) [11] [CITE@en[Name of
group given by and
confusable · Issue #3702 · whatwg/html]] ([TIME[2018-09-04 16:25:54 +09:00]]) [12] [CITE@en[Refer to a fieldset's legend as a caption to reduce confusion by zcorpan · Pull Request #3951 · whatwg/html]] ([TIME[2018-09-04 16:26:32 +09:00]]) [13] [CITE@en[Tweak how accesskey on legend works]] ([[zcorpan]]著, [TIME[2018-09-07 06:25:22 +09:00]]) [14] [CITE@en[focus() on a non-focusable legend delegates focus in WebKit/Chromium · Issue #3950 · whatwg/html]] ([TIME[2018-10-14 17:52:33 +09:00]]) [15] [CITE@en[Tweak how accesskey on legend works by zcorpan · Pull Request #3987 · whatwg/html]] ([TIME[2018-10-14 17:53:06 +09:00]]) [16] [CITE@en[Clarify which legend/figcaption/caption element to use (#146)]] ([[@zcorpan]]著, [TIME[2018-09-08 05:46:12 +09:00]]) [17] [CITE@en[Unclear which legend element to be used as accessible name for fieldset · Issue #145 · w3c/html-aam]] ([TIME[2018-10-17 13:00:43 +09:00]]) [18] [CITE@en[Clarify which legend/figcaption/caption element to use by zcorpan · Pull Request #146 · w3c/html-aam]] ([TIME[2018-10-17 13:02:19 +09:00]]) [19] [CITE@en[Revamp how fieldset and legend rendering is defined]] ([[zcorpan]]著, [TIME[2018-09-20 03:04:40 +09:00]]) [20] [CITE@en[Define whether fieldset's legend should mask border-image · Issue #3930 · whatwg/html]] ([TIME[2018-10-19 17:11:19 +09:00]]) [21] [CITE@en[Define how margin-top on fieldset's legend works · Issue #3929 · whatwg/html]] ([TIME[2018-10-19 17:11:42 +09:00]]) [22] [CITE@en[fieldset's "rendered legend" should force used value of display to block · Issue #3927 · whatwg/html]] ([TIME[2018-10-19 17:12:11 +09:00]]) [23] [CITE@en[fieldset's legend should probably inherit alignment · Issue #3913 · whatwg/html]] ([TIME[2018-10-19 17:12:23 +09:00]]) [24] [CITE@en[The definition of "rendered legend" should use the box tree, or at least the flat tree. · Issue #3331 · whatwg/html]] ([TIME[2018-10-19 17:13:04 +09:00]]) [25] [CITE@en[Unresolvable dependencies in determining the rendered fieldset legend · Issue #2756 · whatwg/html]] ([TIME[2018-10-19 17:13:24 +09:00]]) [26] [CITE@en[Revamp how fieldset and legend rendering is defined by zcorpan · Pull Request #3934 · whatwg/html]] ([TIME[2018-10-19 17:13:59 +09:00]]) [27] [CITE@en[Refer to a fieldset's legend as a caption to reduce confusion]] ([[zcorpan]]著, [TIME[2018-08-21 19:16:49 +09:00]]) [28] [CITE@en[Name of
group given by and
confusable · Issue #3702 · whatwg/html]] ([TIME[2019-03-04 16:40:41 +09:00]]) [29] [CITE@en[Refer to a fieldset's legend as a caption to reduce confusion by zcorpan · Pull Request #3951 · whatwg/html]] ([TIME[2019-03-04 16:41:04 +09:00]])