ColdFusion 2018 cfchart type="html" works in Chrome but not in IE

Chart example testchart.cfm

<cfscript>

     background={}; 

       background={"color":"red","color-2":"white"};

       legend={"background-color":"pink","vertical-align":"bottom","layout":"horizontal","align" :"center"};

       yAxis={"label":{"text":"Some value","color":"red","font-size":"20px"}};

       xAxis={"item":{"font-angle":45}};

    plot={"value-box":{

            "type":"all",

            "text":"%v",

            "text-align":"center",

            "alpha":0.5,

    "placement":"top-in",

    "font-color":"black",

"font-weight":"bold",

"font-family":"arial",

"font-size":"15px",

    "background-color":"none",

            "background-color-2":"none",

            "border-color":"none",

            "border-width":1}};

</cfscript>

<cfchart

   format="html"

   scalefrom="0"

   scaleto="2000000"

   showLegend="yes"

  legend="#legend#" 

   seriesPlacement="stacked"   

   showMarkers="yes"

yAxis="#yAxis#"

xAxis="#xAxis#"

   chartheight="400"

plot="#plot#"

   chartwidth="600"

   background="#background#" >

  <cfchartseries

      type="bar"

      serieslabel="Website Traffic 2016"

      seriescolor="lime">

    <cfchartdata item="January" value="503100" >

    <cfchartdata item="February" value="720310">

    <cfchartdata item="March" value="688700">

    <cfchartdata item="April" value="986500">

    <cfchartdata item="May" value="1063911">

    <cfchartdata item="June" value="1115321">

   </cfchartseries>

  <cfchartseries

      type="bar"

      serieslabel="Website Traffic 2015"

      seriescolor="yellow">

    <cfchartdata item="January" value="#RandRange(300000, 900000)#">

    <cfchartdata item="February" value="#RandRange(300000, 900000)#">

    <cfchartdata item="March" value="#RandRange(300000, 900000)#">

    <cfchartdata item="April" value="#RandRange(300000, 900000)#">

    <cfchartdata item="May" value="#RandRange(300000, 900000)#">

    <cfchartdata item="June" value="#RandRange(300000, 900000)#">

  </cfchartseries>

</cfchart>

</html>

Works in Chrome

but not in IE.  In IE  (all versions)

Does anyone know why this may be happening?