interactive test

Author: archmoj

src/components/fx/hover.js

@@ -769,6 +769,15 @@ function _hover(gd, evt, subplot, noHoverEvent) {
                 y0: y0 + gTop,
                 y1: y1 + gTop
             };
+
+            d3.select('.hover-bbox')
+                .attr('x', x0)
+                .attr('y', y0)
+                .attr('width', Math.max(4, x1 - x0))
+                .attr('height', Math.max(4, y1 - y0))
+                .attr('stroke', 'black')
+                .attr('fill', 'lightgray')
+                .attr('opacity', '0.5');
         }
 
         pt.eventData = [eventData];

src/plot_api/plot_api.js

@@ -3772,6 +3772,8 @@ function makePlotFramework(gd) {
     fullLayout._zoomlayer = fullLayout._toppaper.append('g').classed('zoomlayer', true);
     fullLayout._hoverlayer = fullLayout._hoverpaper.append('g').classed('hoverlayer', true);
 
+    fullLayout._hoverpaper.append('svg').append('rect').classed('hover-bbox', true);
+
     // Make the modebar container
     fullLayout._modebardiv
         .classed('modebar-container', true)