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https://issues.apache.org/jira/browse/TAPESTRY-2364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12637142#action_12637142
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Onno Scheffers commented on TAPESTRY-2364:
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I think the external libraries, especially the Prototype libs should always be
included in the head section. Otherwise it is impossible to execute Javascript
before the page renders, assuming developers are allowed to use Prototype in
their own scripts as well.
Prototype included the dom:loaded event for a reason: This feature is used a
lot!
If you want to create webpages that work without Javascript, you typically
render plain HTML and then modify the HTML with Javascript before rendering, so
you can give people with Javascript a better user-experience.
When all scripts are added to the end of the page, like it is now, the page is
rendered before all resources are loaded and the user sees things (s)he wasn't
supposed to see (like areas collapsing etc.).
I've seen quite a few complaints about it on the mailinglist already and some
people are including the libraries twice into their pages now to work around
problems. If there's hardly a difference in YSlow, then why make things more
complex for developers than they need to be?
> YSlow Recommendation: Write Scripts at bottom of page
> -----------------------------------------------------
>
> Key: TAPESTRY-2364
> URL: https://issues.apache.org/jira/browse/TAPESTRY-2364
> Project: Tapestry
> Issue Type: Improvement
> Components: tapestry-core
> Reporter: Howard M. Lewis Ship
> Assignee: Howard M. Lewis Ship
> Priority: Minor
> Fix For: 5.0.12
>
>
> Tapestry is already doing a good job on this, by writing the dynamically
> generated <script> block at the bottom of the page, but the external scripts
> should also be down there.
> http://developer.yahoo.com/performance/rules.html#js_bottom
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