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https://issues.apache.org/jira/browse/TAP5-1044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12841346#action_12841346
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Howard M. Lewis Ship commented on TAP5-1044:
--------------------------------------------
Please search the archives about this ... it has come up in the past, and is
usually traced back to the XML parser you are using.
> When using a doctype, elements are rendered with default attribute values
> -------------------------------------------------------------------------
>
> Key: TAP5-1044
> URL: https://issues.apache.org/jira/browse/TAP5-1044
> Project: Tapestry 5
> Issue Type: Bug
> Components: tapestry-core
> Affects Versions: 5.1.0.5
> Reporter: Paul Field
>
> It's easiest to see this with an example:
> --------------------
> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
> "http://www.w3.org/TR/html4/strict.dtd";>
> <html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_1_0.xsd";>
> <body>
> <table>
> <tbody>
> <tr>
> <th>x</th>
> </tr>
> </tbody>
> </table>
> </body>
> </html>
> --------------------
> Will render the table row as:
> <tr><th rowspan="1" colspan="1">x</th></tr>
> Notice the rowspan and colspan attributes have appeared.
> If you remove the <!DOCTYPE> then the <th> renders without the
> rowspan/colspan.
> I believe these default values are coming from the DTD. It's not a problem
> for the functionality of the page, but it does add to the size of HTML
> generated (particularly as this affects table cells, of which there are often
> many in a page).
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