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[6] embed 要素の itemprop 属性を指定する場合は、 src 属性も指定しなければなりません >>5。

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[1] IRC logs: freenode / #whatwg / 20090512 (2009-08-09 09:27:08 +09:00 版) http://krijnhoetmer.nl/irc-logs/whatwg/20090512

[2] Web Applications 1.0 r6851 When itemprop='' is specified on elements like <a> or <iframe>, require the corresponding attribute, to help authors who are misusing microdata.Affected topics: HTML, Microdata, Video and Audio ( (2011-12-07 09:35:00 +09:00 版)) http://html5.org/tools/web-apps-tracker?from=6850&to=6851

[3] Web Applications 1.0 r4515 Allow <link itemprop> without rel=''. ( (2010-01-06 18:04:00 +09:00 版)) http://html5.org/tools/web-apps-tracker?from=4514&to=4515

[4] Web Applications 1.0 r6388 Disallow <link> from having both rel='' and itemprop=''. This might change back if there are compelling use cases, but in the meantime it seems like this is likely to catch errors. This also effectively disallows rel='' on <link>s in <body>. ( (2011-08-10 05:08:00 +09:00 版)) http://html5.org/tools/web-apps-tracker?from=6387&to=6388

[7] Fix #208: remove the Microdata API · whatwg/html@2aaecb8 (2015-10-07 20:14:53 +09:00 版) https://github.com/whatwg/html/commit/2aaecb89900b875b9ee8357fa8bccf48477358bb

[8] (2016-03-04 19:08:37 +09:00 版) https://zuuonline.com/

<meta name="keywords" itemprop="keywords" content="ZUU online,ズー,経済,金融,株式,為替,富裕層,資産運用,保険,不動産,相続,事業承継,海外移住,ZOO" />

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