Update marker-style.md

Author: LiamConnors

doc/python/marker-style.md

@@ -6,7 +6,7 @@ jupyter:
       extension: .md
       format_name: markdown
       format_version: '1.3'
-      jupytext_version: 1.14.1
+      jupytext_version: 1.14.6
   kernelspec:
     display_name: Python 3 (ipykernel)
     language: python
@@ -20,7 +20,7 @@ jupyter:
     name: python
     nbconvert_exporter: python
     pygments_lexer: ipython3
-    version: 3.8.0
+    version: 3.10.11
   plotly:
     description: How to style markers in Python with Plotly.
     display_as: file_settings
@@ -361,7 +361,7 @@ fig.show()
 
 ### Using a Custom Marker
 
-To use a custom marker, set the `symbol` on the `marker`. Here we set it to `diamond`.
+To use a custom marker, set the `symbol` on the `marker`. Here we set it to `diamond`. 
 
 
 ```python
@@ -378,6 +378,31 @@ fig.show()
 
 ```
 
+#### Open Marker Colors
+
+In the previous example, each marker has two colors, a marker color (set in Plotly Express with `color="species"`)  and a line color (set on the line with `color="DarkSlateGrey"`. When using open markers, like `"diamond-open"` in the following example, the marker always uses only the marker color. Adding a line color won't update the marker. 
+
+```python
+import plotly.express as px
+
+df = px.data.iris()
+fig = px.scatter(df, x="sepal_width", y="sepal_length", color="species")
+
+fig.update_traces(
+    marker=dict(
+        size=8, 
+        symbol="diamond-open", 
+        line=dict(
+            width=2, 
+#             color="DarkSlateGrey" Line colors don't apply to open markers
+        )
+    ),
+    selector=dict(mode="markers"),
+)
+
+fig.show()
+```
+
 ### Setting Marker Angles