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https://issues.apache.org/jira/browse/SPARK-55774?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kent Yao resolved SPARK-55774.
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Fix Version/s: 4.2.0
Resolution: Fixed
Issue resolved by pull request 54621
[https://github.com/apache/spark/pull/54621]
> Replace custom CSS collapse arrows with Bootstrap 5 accordion indicators
> ------------------------------------------------------------------------
>
> Key: SPARK-55774
> URL: https://issues.apache.org/jira/browse/SPARK-55774
> Project: Spark
> Issue Type: Sub-task
> Components: Web UI
> Affects Versions: 4.2.0
> Reporter: Kent Yao
> Assignee: Kent Yao
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.2.0
>
>
> webui.css (lines 247-266) has ~20 lines of border-based triangle CSS
> (.arrow-open, .arrow-closed) to create up/down collapse indicators.
> Replace with Bootstrap 5 accordion's built-in rotation indicators or simple
> CSS transform on a chevron character/icon. This eliminates fragile
> border-triangle CSS.
> Part of SPARK-55760 (Spark Web UI Modernization)
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