XSD Schema XSD Introduction XSD How To XSD XSD Elements XSD Attributes XSD Restrictions XSD Complex Elements XSD Empty XSD Elements-only XSD Text-only XSD Mixed XSD Indicators XSD XSD XSD Substitution XSD Example XML DTD DTD Introduction DTD Building Blocks DTD Elements DTD Attributes DTD Elements vs Attr DTD Entities DTD Examples XQuery Tutorial XQuery Introduction XQuery Example XQuery FLWOR XQuery HTML XQuery Terms XQuery Syntax XQuery Add XQuery Select XQuery Functions XSLT Tutorial XSLT Introduction XSL Languages XSLT Transform XSLT XSLT XSLT XSLT XSLT XSLT XSLT Apply XSLT on the Client XSLT on the Server XSLT Edit XML XSLT Examples XPath Tutorial XPath Introduction XPath Nodes XPath Syntax XPath Axes XPath Operators XPath Examples XML DOM DOM Introduction DOM Nodes DOM Accessing DOM Node Info DOM Node List DOM Traversing DOM Navigating DOM Get Values DOM Change Nodes DOM Remove Nodes DOM Replace Nodes DOM Create Nodes DOM Add Nodes DOM Clone Nodes DOM Examples XML AJAX AJAX Introduction AJAX XMLHttp AJAX Request AJAX Response AJAX XML File AJAX PHP AJAX ASP AJAX Database AJAX Applications AJAX Examples Only one correct order needs to be provided.XML Tutorial XML HOME XML Introduction XML How to use XML Tree XML Syntax XML Elements XML Attributes XML Namespaces XML Display XML HttpRequest XML Parser XML DOM XML XPath XML XSLT XML XQuery XML XLink XML Validator XML DTD XML Schema XML Server XML Examples XML Quiz XML Certificate There may be more than one order that is "correct" (according to the WCAG 2.0 definition). Providing a particular linear order is only required where it affects meaning. In these cases there are a number of different reading orders for a Web page that can satisfy the Success Criterion. The order of the article and the sidebars does not affect their meaning. As another example, a magazine article contains several callout sidebars. They could occur in either order in the programmatically determined reading sequence. For example, the relative order of the main section of a Web page and a navigation section does not affect their meaning. The order of content in a sequence is not always meaningful. Tables and ordered lists are meaningful sequences, but unordered lists are not. For instance, in HTML, text is always a meaningful sequence. The semantics of some elements define whether or not their content is a meaningful sequence. In such a situation, the articles themselves may have meaningful sequence, but the container that contains the articles may not have a meaningful sequence. Content that does not meet this Success Criterion may confuse or disorient users when assistive technology reads the content in the wrong order, or when alternate style sheets or other formatting changes are applied.Ī sequence is meaningful if the order of content in the sequence cannot be changed without affecting its meaning.įor example, if a page contains two independent articles, the relative order of the articles may not affect their meaning, as long as they are not interleaved. It is important that it be possible to programmatically determine at least one sequence of the content that makes sense. The intent of this Success Criterion is to enable a user agent to provide an alternative presentation of content while preserving the reading order needed to understand the meaning.
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