Kent Yao created SPARK-55774:
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Summary: 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
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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