Currently LineSeries, ScatterSeries and ScatterLineSeries expose MarkersType property that gets only three values - Circle, Square and Triangle. Add the ability to set  custom images as markers as well. 

Currently labels of SeriesItems with values greater or equal  to the YAxis MaxValue are being cut:

    When chart title is not set.
    AND the labels position is set to Above for AreaSeries, LineSeries, ScatterSeries and ScatterLineSeries.
    OR the labels position is set to outsideEnd for ColumnSeries.
    In FireFox, Opera and WebKit browsers.

For the time being the chart title can be set with space character.

Your html charts are coming along beautifully - Just want more! Particularly a Spline chart - ideally to add as option for combination charts.  This could also work as a Pareto chart.

In a chart that has stacked bar series and a line series the bar series become column series when the chart is data-bound.

The solution is to declare the BarSeries above the LineSeries as follows:
            <%--BarSeries are declared above the LineSeries--%>
            <telerik:BarSeries Name="B1">
                <Items>
                    <telerik:SeriesItem YValue="10" />
                    <telerik:SeriesItem YValue="20" />
                    <telerik:SeriesItem YValue="30" />
                </Items>
            </telerik:BarSeries>
            <%--LineSeries are declared below the BarSeries--%>
            <telerik:LineSeries Name="L1">
                <Items>
                    <telerik:SeriesItem YValue="15" />
                    <telerik:SeriesItem YValue="10" />
                    <telerik:SeriesItem YValue="20" />
                </Items>
            </telerik:LineSeries>

A couple of suggestions in one...

Please add interactivity between RadPivotGrid and HTMLChart similar to pivot charts in MS Excel - making the filters and selections. update both the chart and the pivot table.  It will also be helpful if you can add splicers similar to PowerPivot.

When you click on the chart, it opens a popup menu, relative to that area - where you can select to filter that axis or value in a series, change the aggregate calculation for that value (sum, count, average, etc.), change date ranges on a date axis - like, date range picker, by year, fiscal, quarter, week, etc. 

Thanks,

Vermaak

When Series are created programmatically, Axes settings are not preserved after postback. The workaround is to create an empty series in the markup. For example:

        <telerik:RadHtmlChart ID="RadHtmlChart1" runat="server">
...
            <PlotArea>
                <YAxis>...</YAxis>
                <XAxis>...</XAxis>
                <Series>
                    <telerik:ScatterLineSeries Name=" ">
                        <Appearance FillStyle-BackgroundColor="Transparent"></Appearance>
                    </telerik:ScatterLineSeries>
                </Series>
            </PlotArea>
        </telerik:RadHtmlChart>

Does not visualize data for some of the cases. I attached a project related to this bug. In the code there is an option with data which RadHtmlChart do visualize and there is option for data which RadHtmlChard don't visualize.

All the code is located in Default.aspx

PS: With tooltip commented data do visualized in both cases.

Gregory.

Currently when RadHtmlChart is placed inside  RadSplitter with RadSlidingZone a JavaScript error is thrown when the following conditions are met:

1.RadHtmlChart doesn't have its width property set

2.The position of the RadHtmlChart's legend is changed in the codebehind

The workaround is to set the width property of the chart.

It would be great to have this new chart type.

RadHtmlChart should allow the usage of indices in the DataFormatString when DateTime values are used:
                <XAxis Type="Date">
                    <LabelsAppearance DataFormatString="{0:d}" />
                </XAxis>

The workaround is to set <MarkersAppearance Visible="false"  />.

Hover over first legend item highlights all chart sections for donut chat type.
Hover over the rest of the legend items doesn't highlight the corresponding section of the donut chart.

increase line width when mouse hovers

For the time being the CommonTooltipsAppearance.Shared property must be set to false. For example:

        <telerik:RadHtmlChart ID="RadHtmlChart2" runat="server" Layout="Sparkline" Width="100" Height="150">
            <PlotArea>
                <CommonTooltipsAppearance Shared="false"></CommonTooltipsAppearance>
                <Series>
                    <telerik:LineSeries>
                        <TooltipsAppearance>
                            <ClientTemplate>
                                Value: #=value# <br />
                                Category #=category#
                            </ClientTemplate>
                        </TooltipsAppearance>
                        <SeriesItems>
                            <telerik:CategorySeriesItem Y="30" />
                            <telerik:CategorySeriesItem Y="10" />
                            <telerik:CategorySeriesItem Y="20" />
                        </SeriesItems>
                    </telerik:LineSeries>
                </Series>
                <XAxis>
                    <Items>
                        <telerik:AxisItem LabelText="item 1" />
                        <telerik:AxisItem LabelText="item 2" />
                        <telerik:AxisItem LabelText="item 3" />
                    </Items>
                </XAxis>
            </PlotArea>
        </telerik:RadHtmlChart>

Declined with the following reason - chart series are preserved in the ViewState by default. You can do one of the following:
1) Either disable the ViewState of the chart or its container:
ASPX:
<asp:Panel ID="Panel1" runat="server" EnableViewState="false" />
C#:
		RadHtmlChart chart1 = new RadHtmlChart();
		chart1.EnableViewState = false;
2) Or clear the chart Series collection after adding the chart to the page:
		RadHtmlChart chart1 = new RadHtmlChart();
		chart1.ID = "myChart";
		//Add the chart to the page
		Panel1.Controls.Add(chart1);
		//Clear the series after adding the chart to the page
		chart1.PlotArea.Series.Clear();