Wikipedia:画像の代替テキスト

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出典 ^ a b c d .mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation.cs-ja1 q,.mw-parser-output .citation.cs-ja2 q{quotes:"「""」""『""』"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free a,.mw-parser-output .citation .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited a,.mw-parser-output .id-lock-registration a,.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription a,.mw-parser-output .citation .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:#d33}.mw-parser-output .cs1-visible-error{color:#d33}.mw-parser-output .cs1-maint{display:none;color:#3a3;margin-left:0.3em}.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}"G94: Providing short text alternative for non-text content that serves the same purpose and presents the same information as the non-text content" (英語). W3C. 11 December 2008. 2010年4月4日閲覧。
^ Lazar, J; Allen, A; Kleinman, J; Malarkey, C (2007). ⇒"What frustrates screen reader users on the web: a study of 100 blind users" (PDF). Int J Hum Comput Interact (英語). 22 (3): 247?269. doi:10.1080/10447310709336964。
^ a b c d e "Appropriate use of alternative text" (英語). WebAIM. 2010年4月4日閲覧。
^ W3C. F89: Failure (...) due to using null alt on an image where the image is the only content in a link, Techniques for WCAG 2.0, accessed November 5, 2014
^ WebAIM says: "An image that is the only thing inside a link must never have a missing or null alt attribute. This is because the screen reader must read SOMETHING to identify the link." See WebAIM. Appropriate Use of Alternative Text, accessed June 3, 2014.
^ "Understanding Success Criterion 1.1.1; Understanding WCAG 2.0" (英語). W3C. 11 December 2008. 2010年4月4日閲覧。
^ G74: Providing a long description in text near the non-text content, with a reference to the location of the long description in the short description, WCAG 2.0 technique. WebAim writes: "[T]he alt attribute (sometimes called the alt tag, though technically this is incorrect) is not the only mechanism for providing the content and function of the image. This information can also be provided in text adjacent to the image or within the page containing the image. ... The term alternative text, as used in this article, refers to the text equivalent for an image, regardless of where that text resides. It does not refer solely to the alt attribute of the image tag. See WebAIM. Appropriate Use of Alternative Text, accessed June 8, 2010.
^ Wikimedia bug 18682
^ Petrie, Helen; Harrison, Chandra; and Dev, Sundeep. Describing images on the Web: a survey of current practice and prospects for the future, Centre for Human Computer Interaction Design, City University London, accessed June 8, 2010.
^ W3C. H24: Providing text alternatives for the area elements of image maps, WCAG 2.0 technique.

関連項目

 alt属性

 外部リンク

Requirements for providing text to act as an alternative for images - HTML 5.1の仕様書より

Fangs - スクリーンリーダーをエミュレートするMozilla Firefoxのアドオン

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出典: フリー百科事典『ウィキペディア（Wikipedia）』
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