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From "I D (JIRA)" <j...@apache.org>
Subject [jira] [Created] (TAP5-2507) When Zone is used within head element, it moves elements from head to body element
Date Tue, 29 Sep 2015 16:06:04 GMT
I D created TAP5-2507:
-------------------------

             Summary: When Zone is used within head element, it moves elements from head to
body element
                 Key: TAP5-2507
                 URL: https://issues.apache.org/jira/browse/TAP5-2507
             Project: Tapestry 5
          Issue Type: Bug
          Components: tapestry-core
    Affects Versions: 5.4
            Reporter: I D
            Priority: Minor


In our project we tried to surround the <title> element with a <t:zone>, in order
to be able to refresh it via ajax.

For a while, this seemed to work. However, a strange bug led us to discover what this caused
behind the scenes: the <title> element, as well as all the <link> elements importing
stylesheets (?!), were now being rendered as children of the <body> element instead
of as children of the <head> element. This happened not only following a refresh of
this zone, but even on initial render.

The fact that the CSS links were moved by tapestry (not clear why - the zone only contained
the title tag) was surprisingly well handled by browser (I never guessed that <title>
and <link> elements would be "respected" by the browser even when they are in the document
body rather than its head), but it had at least one annoying side-effect - the page began
to render before the CSS was applied, which resulted in a strange flicker immediately following
page load.

We now realize that Zone cannot / should not be used within the head element, but the way
we discovered this was too roundabout. I think the reasonable behavior should be either of
the following:

- Prevent Zone from being used inside the <head> element by throwing an appropriate
exception on page load (this should also be stated in the documentation for the Zone component)

or

- Allow Zone to be used inside the <head> element, but don't move elements around the
DOM tree - keep whatever's in the <head> element within the <head> element.



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