- From: Gregory J. Rosmaita <oedipus@hicom.net>
- Date: Thu, 26 Jul 2007 12:11:16 -0400
- To: www-archive@w3.org
- Message-Id: <20070726160830.M85386@hicom.net>
the attached is an attempt to both provide the HTML working group with an example of a table using the scope and axis attributes defined for TD and TH, as well as an illustration of the following: <q cite="http://www.w3.org/TR/CSS2/tables.html#q21"> 17.7 Audio rendering of tables When a table is spoken by a speech generator, the relation between the data cells and the header cells must be expressed in a different way than by horizontal and vertical alignment. Some speech browsers may allow a user to move around in the 2-dimensional space, thus giving them the opportunity to map out the spatially represented relations. When that is not possible, the style sheet must specify at which points the headers are spoken. 17.7.1 Speaking headers: the 'speak-header' property 'speak-header' Value: once | always | inherit Initial: once Applies to: elements that have table header information Inherited: yes Percentages: N/A Media: aural This property specifies whether table headers are spoken before every cell, or only before a cell when that cell is associated with a different header than the previous cell. Values have the following meanings: once The header is spoken one time, before a series of cells. always The header is spoken before every pertinent cell. Each document language may have different mechanisms that allow authors to specify headers. For example, in HTML 4.0 ([HTML40]), it is possible to specify header information with three different attributes ("headers", "scope", and "axis"), and the specification gives an algorithm for determining header information when these attributes have not been specified. Image of a table created in MS Word [SRC = http://www.w3.org/data/html/reference/CSS2/images/table1.gif] [D link = http://www.w3.org/TR/CSS2/IMAGES/LONGDESC/table1-desc.html] Image of a table with header cells ("San Jose" and "Seattle") that are not in the same column or row as the data they apply to. This HTML example presents the money spent on meals, hotels and transport in two locations (San Jose and Seattle) for successive days. Conceptually, you can think of the table in terms of a n-dimensional space. The headers of this space are: location, day, category and subtotal. Some cells define marks along an axis while others give money spent at points within this space. The markup for this table is: <TABLE> <CAPTION>Travel Expense Report</CAPTION> <TR> <TH></TH> <TH>Meals</TH> <TH>Hotels</TH> <TH>Transport</TH> <TH>subtotal</TH> </TR> <TR> <TH id="san-jose" axis="san-jose">San Jose</TH> </TR> <TR> <TH headers="san-jose">25-Aug-97</TH> <TD>37.74</TD> <TD>112.00</TD> <TD>45.00</TD> <TD></TD> </TR> <TR> <TH headers="san-jose">26-Aug-97</TH> <TD>27.28</TD> <TD>112.00</TD> <TD>45.00</TD> <TD></TD> </TR> <TR> <TH headers="san-jose">subtotal</TH> <TD>65.02</TD> <TD>224.00</TD> <TD>90.00</TD> <TD>379.02</TD> </TR> <TR> <TH id="seattle" axis="seattle">Seattle</TH> </TR> <TR> <TH headers="seattle">27-Aug-97</TH> <TD>96.25</TD> <TD>109.00</TD> <TD>36.00</TD> <TD></TD> </TR> <TR> <TH headers="seattle">28-Aug-97</TH> <TD>35.00</TD> <TD>109.00</TD> <TD>36.00</TD> <TD></TD> </TR> <TR> <TH headers="seattle">subtotal</TH> <TD>131.25</TD> <TD>218.00</TD> <TD>72.00</TD> <TD>421.25</TD> </TR> <TR> <TH>Totals</TH> <TD>196.27</TD> <TD>442.00</TD> <TD>162.00</TD> <TD>800.27</TD> </TR> </TABLE> By providing the data model in this way, authors make it possible for speech enabled-browsers to explore the table in rich ways, e.g., each cell could be spoken as a list, repeating the applicable headers before each data cell: San Jose, 25-Aug-97, Meals: 37.74 San Jose, 25-Aug-97, Hotels: 112.00 San Jose, 25-Aug-97, Transport: 45.00 ... The browser could also speak the headers only when they change: San Jose, 25-Aug-97, Meals: 37.74 Hotels: 112.00 Transport: 45.00 26-Aug-97, Meals: 27.28 Hotels: 112.00 </q> ------------------------------------------------------------------ I must think myself independent, as long as I live; the feeling is essential to my existence. -- John Adams ------------------------------------------------------------------ Gregory J. Rosmaita: oedipus@hicom.net or gregory@ubats.org Camera Obscura: http://www.hicom.net/~oedipus/ Oedipus' Online Complex: http://my.opera.com/oedipus/ UBATS - United Blind Advocates for Talking Signs: http://ubats.org ------------------------------------------------------------------
Attachments
- text/html attachment: table-scope-axis.html
Received on Thursday, 26 July 2007 16:11:21 UTC