TAL blocks inside <style> result in parse error

[Wichert Akkerman]

I am trying to create some conditional CSS. This renders correctly:

    <tal:block>
      <style type="text/css">
      </style>
    </tal:block>

but this results in a NestingError:

    <style type="text/css">
      <tal:block>
      </tal:block>
    </style>

This might be related to #143103.

[Wichert Akkerman (wichert)]

The mystery continues. Take this simple bit of markup:

    <style type="text/css" tal:define="logo webhelpers/sector_logo" tal:condition="python:logo">
        #navigation li#home {
          background: url(<tal:block replace="logo"/>) no-repeat;
        }
    </style>

the rendered output of that is:

    <style type="text/css">
        #navigation li#home {
          background: url(<tal:block replace="logo"/>) no-repeat;
        }
    </style>

For some reason the TAL statement is not executed.

[Wichert Akkerman (wichert)]

There is a workaround, but it is so awful you might want to avert your eyes before looking at it:

    <tal:block define="logo webhelpers/sector_logo" condition="python:logo">
      <tal:pain replace="structure string:&lt;"/>style type="text/css"<tal:pain replace="structure string:&gt;"/>
        #navigation li#home {
          background: url(<tal:block replace="logo"/>) no-repeat;
        }
      <tal:pain replace="structure string:&lt;"/>/style<tal:pain replace="structure string:&gt;"/>
    </tal:block>

As a final note I'ld like to add that chameleon.zpt does not suffer from this problem.

[Christian Zagrodnick (zagy)]

The content of <style> is conciderd cdata afaik. What you can do is <style tal:content="

#your css {}
"></style>

[Wichert Akkerman (wichert)]

I can not think of a good reason to treat the contents of <style> as CDATA, especially in XHTML templates. If you want CDATA you should use the CDATA markers. The current magic treatment of <style> (and <script>) makes it extremely hard to accomplish reasonably common goals.

[Colin Watson (cjwatson)]

The zope.tal project on Launchpad has been archived at the request of the Zope developers (see https://answers.launchpad.net/launchpad/+question/683589 and https://answers.launchpad.net/launchpad/+question/685285). If this bug is still relevant, please refile it at https://github.com/zopefoundation/zope.tal.

[Colin Watson (cjwatson)]

The zope2 project on Launchpad has been archived at the request of the Zope developers (see https://answers.launchpad.net/launchpad/+question/683589 and https://answers.launchpad.net/launchpad/+question/685285). If this bug is still relevant, please refile it at https://github.com/zopefoundation/zope2.