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https://issues.apache.org/jira/browse/WICKET-6725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17021442#comment-17021442
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Emond Papegaaij commented on WICKET-6725:
-----------------------------------------
[~svenmeier] Even with the hidden attribute, a stylesheet was still required to
make sure the elements stayed invisible. I went for simplicity and used a class
to style the element. I could have used the hidden attribute in CSS as a
selector, but I think our users are more comfortable with styling classes.
> CSP: display:none in Component.renderPlaceholderTag
> ---------------------------------------------------
>
> Key: WICKET-6725
> URL: https://issues.apache.org/jira/browse/WICKET-6725
> Project: Wicket
> Issue Type: Improvement
> Components: wicket-core
> Reporter: Emond Papegaaij
> Assignee: Emond Papegaaij
> Priority: Major
> Fix For: 9.0.0-M5
>
>
> org.apache.wicket.*Component*#renderPlaceholderTag : should rather add some
> special css class, or javascript which can set display none programmatically
> (and can also be nonced)
> {code:java}
> response.write("<");
> response.write(name);
> response.write(" id=\"");
> response.write(getAjaxRegionMarkupId());
> response.write("\" style=\"display:none\" data-wicket-placeholder=\"\"></");
> response.write(name);
> response.write(">");
> {code}
> (org.apache.wicket.extensions.ajax.markup.html.AjaxIndicatorAppender#afterRender
> has the same issue)
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