ARIA label for the canvas

ietf/templates/wagtailcharts/blocks/chart_block.html

@@ -0,0 +1,9 @@
+{% if self.title %}<h3>{{self.title}}</h3>{% endif %}
+<canvas
+  id="chart-{{block.id}}"
+  data-datasets="{{self.datasets}}"
+  data-config="{{self.settings.config}}"
+  data-chart-type="{{self.chart_type}}"
+  role="img"
+  aria-label="A chart {% if self.title %}of {{self.title}}{%endif%}"
+></canvas>