Streamlit's st.expander has a new icon parameter that allows you to set an icon or emoji for the expander. This can be a string representing an emoji, or a shortcode representing a Material icon.
| Parameter | Description |
|---|---|
icon (str, or None) |
An optional emoji or icon to display next to the button label. If icon is None (default), no icon is displayed. If icon is a string, the following options are valid: A single-character emoji. For example, you can set icon="🚨" or icon="🔥". Emoji short codes are not supported. An icon from the Material Symbols library (outlined style) in the format ":material/icon_name:" where "icon_name" is the name of the icon in snake case. For example, icon=":material/thumb_up:" will display the Thumb Up icon. Find additional icons in the Material Symbols font library. |
See the PoC implementation.