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Re: fear of "invisible metadata"

From: Laura Carlson <laura.lee.carlson@gmail.com>
Date: Mon, 18 Jun 2007 13:16:05 -0500
Message-ID: <1c8dbcaa0706181116q5b23b180mae14259fe899ad07@mail.gmail.com>
To: public-html@w3.org

>From W3C WCAG 2.0 [1]:

> H73: Using the summary attribute of the table element to give an
> overview of data tables
>
> Description
>
> The objective of this technique is to provide a brief overview of how
> a data table is organized or a brief explanation of how to navigate
> the table. The summary attribute of the table element makes this
> information available to people who use screen readers; the
> information is not displayed visually.
>
> The summary is useful when the table has a complex structure (for
> example, when there are several sets of row or column headers, or
> when there are multiple groups of columns or rows). The summary may
> also be helpful for simple data tables that contain many columns or
> rows of data.
>
> The summary attribute may be used whether or not the table includes a
> caption element. If both are used, the summary should not duplicate
> the caption.
>
> Although WCAG 2 does not prohibit the use of layout tables, CSS-based
> layouts are recommended in order to retain the defined semantic
> meaning of the HTML table elements and to conform to the coding
> practice of separating presentation from content. However, if a
> layout table is used, then the summary attribute is not used or is
> null. [LC-1407] The purpose of a layout table is simply to control
> the placement of content; the table itself is "transparent" to the
> user. A summary would "break" this transparency by calling attention
> to the table. A null summary (summary="") on layout tables is
> acceptable.

[1] http://www.w3.org/TR/WCAG20-TECHS/#H73

Best Regards,
Laura

-- 
Laura L. Carlson
http://www.d.umn.edu/goto/webdesign/
Received on Monday, 18 June 2007 18:16:10 UTC

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