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https://issues.apache.org/jira/browse/HADOOP-3879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12618780#action_12618780
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Steve Loughran commented on HADOOP-3879:
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+1 to JSP/JSPX pages with XHTML bodies that XPath can run things over. Then I'd 
like health checks that can return a 5XX error when the far end isn't happy, so 
that routers and other monitoring tools can look at the content. 

> Fix HTML validation warnings in web UI
> --------------------------------------
>
>                 Key: HADOOP-3879
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3879
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs, mapred
>            Reporter: Tom White
>            Priority: Minor
>
> Many of the web pages in the admin webapp are invalid HTML according to the 
> W3C validator (http://validator.w3.org/). They should be fixed so they render 
> correctly in a wide range of browsers.

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