Streamlit Plotly Chart Width='content' Deprecation Warning

Hey there, Streamlit enthusiasts! Ever been happily building your data dashboards, dropping in some awesome Plotly charts, and then BAM! You get hit with a deprecation warning that seems to come out of nowhere? If you've been using `st.plotly_chart` with the `width="content"` (or `height="content"`) setting, you might have noticed this. It's a bit of a head-scratcher, right? You're following the documentation, using what seems like a perfectly valid parameter, and yet, the warning gods are displeased. Let's dive into why this happens and what it means for your Streamlit applications. We'll explore the nitty-gritty of this specific deprecation warning and get you back to building slick UIs without the nagging alerts. This isn't just about fixing a warning; it's about understanding how Streamlit handles arguments and how to keep your code clean and future-proof. So, grab your favorite beverage, and let's unravel this `kwargs` conundrum together!

Understanding the `plotly_chart` Deprecation Warning

So, what's the deal with this `plotly_chart` kwargs deprecation warning? At its core, it stems from a change Streamlit made to how it handles arbitrary keyword arguments (often shortened to `kwargs`). In previous versions, `st.plotly_chart` was a bit more lenient with how you passed arguments. You could, in some cases, pass arguments that were intended for the underlying Plotly figure itself directly to `st.plotly_chart`. However, this can lead to confusion and potential conflicts as Streamlit evolves and Plotly's own API changes. To create a clearer and more robust API, Streamlit decided to deprecate the use of variable keyword arguments that are not explicitly documented as being part of the `st.plotly_chart` function's signature.

The warning message you might see looks something like this: "Variable keyword arguments for st.plotly_chart have been deprecated and will be removed in a future release. Use the `config` argument instead to specify Plotly configuration options.". Now, here's the kicker: many users report seeing this warning *even when they aren't explicitly passing any variable keyword arguments*. They are simply using documented parameters like `width="content"` or `height="content"`. This is where the confusion often arises. It appears that the internal implementation of how Streamlit handles these width/height arguments might be triggering the `kwargs` check, leading to the warning.

The intention behind this change is to encourage developers to use the `config` parameter for Plotly-specific settings. The `config` parameter is designed to be a dictionary where you can pass a wide array of configurations for your Plotly charts, ensuring that these settings are correctly interpreted and managed by Streamlit. For instance, instead of passing `width` directly to `st.plotly_chart`, you might eventually be expected to pass such configurations within the `config` dictionary. However, when a documented parameter like `width="content"` itself triggers a warning about *undocumented* `kwargs`, it suggests a slight mismatch between the internal handling and the user-facing warning logic. This can be a bit frustrating because, from the user's perspective, `width="content"` is a valid and documented way to control the chart's display size, making it responsive to its container.

The core issue seems to be that the check for `if kwargs:` is being executed, and perhaps the `width` parameter, when set to `