Samuel Richardson wrote:
Your confusing web accessibility with web standards, a page can be valid XHTML while not being accessible, likewise this works in reverse.
I believe that Karl rightly meant web standards in the wider sense. It's not just the syntax side (valid XHTML, CSS layout) but the semantic/structural side of web standards (headers are marked up as H1, H2, etc, inputs and other form widgets are appropriately labelled, etc)...
Of course, a lot of AT compensate for tag soup, and a page that is just shy of validation because of some trivial syntax error is not, in most cases, going to cause a huge accessibility barrier. However, a site/system that completely does away with correct semantics, uses triple- or quadruple-nested tables for layout, etc will be a lot more difficult, if not impossible, to use by users relying on AT.
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