* 歴史

[1]
[CODE(DOMm)@en[getAttribute]] は[[属性]]が[[指定]]されていない時[[空文字列]]を返すはずだが、
[[Webブラウザ]]は [CODE(DOM)@en[[[null]]]] を返す。

[[Internet Explorer]], [[Firefox]], [[Safari]], [[Konquerer]], [[iCab]]
は [CODE(DOM)@en[[[null]]]] を返し、 [[Opera]]
は現在[[空文字列]]を返すものの、修正される見込みだそうで。

[CITE@en[[dom3core] getAttribute]]
<mid:op.s0gislje64w2qv@id-c0020.q42.local>,
<http://permalink.gmane.org/gmane.comp.web.dom.general/1312>

([[名無しさん]] [WEAK[2005-11-25 07:44:46 +00:00]])

[3] [CITE@en[WICD Mobile 1.0]]
( ([TIME[2010-08-17 16:50:39 +09:00]] 版))
<http://www.w3.org/TR/WICDMobile/#dom-core-subset-ext>

[2]
[CITE[getAttribute(attr) != null considered harmful - Anne’s Weblog about Markup & Style]] <http://annevankesteren.nl/2005/12/null>
([[名無しさん]] [WEAK[2005-12-03 03:47:52 +00:00]])



[4] [CITE@en[Restore getAttributeNS() · whatwg/dom@ce331fd]]
([TIME[2016-03-30 11:14:24 +09:00]] 版)
<https://github.com/whatwg/dom/commit/ce331fdca4ac2f5ec17ce71ce0df29ee7d90d88c>

[5] [CITE@en[Make the DOMTokenList creation steps use "get an attribute value"]]
([[TRowbotham]]著, [TIME[2018-08-09 00:26:22 +09:00]])
<https://github.com/whatwg/dom/commit/28cdb47e557c814fcca60759f4cce43e9c0e9a47>

[6] [CITE@en["When a DOMTokenList object is created, then: ..." · Issue #666 · whatwg/dom]]
([TIME[2018-08-14 23:48:57 +09:00]])
<https://github.com/whatwg/dom/issues/666>

[7] [CITE@en[Make the DOMTokenList creation steps use "get an attribute value" by TRowbotham · Pull Request #673 · whatwg/dom]]
([TIME[2018-08-14 23:49:06 +09:00]])
<https://github.com/whatwg/dom/pull/673>

[8] [CITE@en[Editorial: embrace that attributes are objects]]
([[annevk]], [TIME[2019-12-12 02:40:19 +09:00]], [TIME[2022-01-27T11:52:13.000Z]])
<https://github.com/whatwg/dom/commit/0038d097f5cad2a7ffdbe75c234b58960aa320f6>