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https://issues.apache.org/jira/browse/WICKET-7114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17883815#comment-17883815
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Martin Tzvetanov Grigorov commented on WICKET-7114:
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Also see
https://www.coderdreams.com/tracking-down-a-bug-in-production-wicket-application/
> DefaultMarkupIdGenerator creates duplicate IDs in
> RuntimeConfigurationType.DEVELOPMENT
> --------------------------------------------------------------------------------------
>
> Key: WICKET-7114
> URL: https://issues.apache.org/jira/browse/WICKET-7114
> Project: Wicket
> Issue Type: Bug
> Components: wicket-core
> Affects Versions: 8.15.0, 9.17.0, 10.1.0
> Reporter: Simon Voges
> Priority: Minor
>
> While testing an application for accessibility, I noticed the analyzer
> reporting duplicated ids in markup. The issue was hard to reproduce, so I
> didn't give it much attention.
> When I finally found a way to reproduce it, I tracked it down to a bug in
> {{{}DefaultMarkupIdGenerator{}}}. If the application is running in
> Development mode, the {{DefaultMarkupIdGenerator}} will prefix every
> generated MarkupId with the Components id. If the component is a repeaters
> child, the ID will be numeric.
> Dependening on the order of the Components, it is possible that
> {{DefaultMarkupIdGenerator}} will generate duplicated ids.
>
> ||markupIdPrefix (component.getId())||markupIdPostfix (sequence value as hex
> string)||effective markupId||
> |11|a|11a|
> |1|1a|11a|
> Fixing it by adding a delimiter seems like a straightforward solution, but
> I'm not sure what could break down the road. I'm especially worried that many
> tests might brake in the wild, because it is just so convenient to use the
> markup ids in the tests.
>
> Duplicate IDs are a problem because it just breaks the spec.
> {quote}
> The id global attribute defines an identifier (ID) which must be unique in
> the whole document.
> {quote}
> [mdn
> webdocs|https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/id]
> *Steps to reproduce*
> Please have a look into https://github.com/HerrDietz/WICKET-7114. This repo
> contains two test cases. One is a unit test for {{DefaultMarkupIdGenerator}},
> the other one renders a page containing a duplicated id.
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