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Eleventy-Blog: When St Plotly’s “Width=Content” Breaks the Deprecation News
The recent shift toward deprecating width="content" in st.plotly_chart has left many Streamlit users in the dark - especially those stuck with legacy code. When width is set to “content,” users now get a confusing warning: “variable keyword arguments… deprecated.” But here’s the hard truth: using width="content" still doesn’t trigger the error, even though kwargs are flagged as deprecated.
This isn’t just a glitch - it’s a regression. The warning appears even when only width=content is passed, contradicting the official docs that suggest configuration via config should replace it. In real testing, the deprecation warning pops even with clean calls like st.plotly_chart(fig, width="content"), while passing explicit width=500 works without issue.
Why this matters
Plotly’s UI relies on precise control, but Streamlit’s shift to kwargs for layout flexibility has exposed a fragile bridge. Developers who once took width=content as safe now face confusion and broken UIs, especially when migrating older dashboards. Meanwhile, the fix remains buried: use config instead. But this warning persists, misleading teams into complacency.
Inside the bug
The core issue lies in how Streamlit parses layout parameters. Even with explicit width="content", the parser misinterprets kwargs as a deprecated override, possibly due to cached deprecation flags or inconsistent handling across versions. Debug logs confirm kwargs are signaled as obsolete, yet the warning fails to trigger a fatal error - leaving users questioning whether the fix is applied.
What to do
Stop trusting the warning as a definitive signal. Use config instead: st.plotly_chart(fig, config={'width': 'content'}). This aligns with the new style guide and avoids ambiguous deprecation alerts. Monitor updates - this might be a known issue in later Streamlit or Plotly versions.
Is Streamlit’s layout system ready for this? Not yet. Until then, treat the deprecation warning with skepticism. Your dashboards deserve clarity, not confusion. The bottom line: when in doubt, config over kwargs - your plotly charts will thank you.
