Adds in the CSS worksshot section of the documentation an example of …

…how to style svg markers in the CSS styling declaration
geoserver · Feb 26, 2024 · cf03c0f · cf03c0f
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diff --git a/doc/en/user/source/styling/workshop/css/point.rst b/doc/en/user/source/styling/workshop/css/point.rst
@@ -200,6 +200,30 @@ This technique was shown with the initial file:`airport.svg` CSS example.
 
    .. image:: ../style/img/point_graphic_2.png
 
+#. SVG external graphics styles can also be declared in the CSS code.
+
+   Using the **symbol** function in the **mark** property.
+
+   The styles declarations have to icluded in the **:mark** pseudo-class.
+
+   .. code-block:: css
+
+      /* @title red triangle with blue stroke */
+      *{
+         mark: symbol('https://www.svgrepo.com/show/488433/triangle.svg');
+         mark-mime: "image/svg";
+         mark-size: 25;
+         :mark {
+            fill: #ff3300;
+            stroke: blue;
+            stroke-width: 5px;
+         }
+      }
+
+#. Will result in a modified style for an external SVG graphic resource.
+
+   .. image:: ../style/img/point_graphic_3.png 
+
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diff --git a/doc/en/user/source/styling/workshop/style/img/point_graphic_3.png b/doc/en/user/source/styling/workshop/style/img/point_graphic_3.png