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https://issues.apache.org/jira/browse/WICKET-6686?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kondratev updated WICKET-6686:
-------------------------------------
    Description: 
The IE9 support has been dropped recently, which means that things such as IE 
conditionals are no longer needed in the code. The clean up could be done in 
one of future releases.

*Criteria*
* Remove all conditional comments such as `<!--[if` from HeaderItem subclasses
* Remove other legacy things, which are no longer needed by modern browsers 
from HeaderItem subclesses, CssUtils and JavaScriptUtils

Look for deprecated attributes in these articles:
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/style
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/link

  was:
The IE9 support has been dropped recently, which means that things such as IE 
conditionals are no longer needed in the code. The clean up could be done in 
one of future releases.

*Criteria*
* Remove all conditional comments such as `<!--[if` from HeaderItem subclasses
* Remove other legacy things, which are no longer needed by modern browsers 
from HeaderItem subclesses, CssUtils and JavaScriptUtils


> Clean up header items infrastructure (conditionals)
> ---------------------------------------------------
>
>                 Key: WICKET-6686
>                 URL: https://issues.apache.org/jira/browse/WICKET-6686
>             Project: Wicket
>          Issue Type: Improvement
>          Components: wicket-core
>            Reporter: Andrew Kondratev
>            Priority: Major
>
> The IE9 support has been dropped recently, which means that things such as IE 
> conditionals are no longer needed in the code. The clean up could be done in 
> one of future releases.
> *Criteria*
> * Remove all conditional comments such as `<!--[if` from HeaderItem subclasses
> * Remove other legacy things, which are no longer needed by modern browsers 
> from HeaderItem subclesses, CssUtils and JavaScriptUtils
> Look for deprecated attributes in these articles:
> https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script
> https://developer.mozilla.org/en-US/docs/Web/HTML/Element/style
> https://developer.mozilla.org/en-US/docs/Web/HTML/Element/link



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