Merge pull request #26677 from sunnyrjuneja/master

Chartist - Make ns optional for svg

types/chartist/chartist-tests.ts

@@ -343,6 +343,7 @@ chart2.on('draw', (data: any) => {
             style: 'fill-opacity: 1'
         }, 'ct-area');
 
+        triangle.attr({ style: 'fill-opacity: .5' });
         // With data.element we get the Chartist SVG wrapper and we can replace the original point drawn by Chartist with our newly created triangle
         data.element.replace(triangle);
     }

types/chartist/index.d.ts

@@ -534,7 +534,7 @@ declare namespace Chartist {
         /**
          * Set attributes on the current SVG element of the wrapper you're currently working on.
          */
-        attr(attributes: Object | string, ns: string): Object | string;
+        attr(attributes: Object | string, ns?: string): Object | string;
 
         /**
          * Create a new SVG element whose wrapper object will be selected for further operations. This way you can also create nested groups easily.