how to add annotation text to a Highcharts chart?

Question

We'd like to add some textual annotation to the charts we create using Highcharts.js.

Ideally we would like to show the annotation in a pop-up window when you mouse over the chart title or a question-mark next to the chart title.

For example:

<b>Chart Title</b>
<sup>
<a href="#" class="chart-tooltip" title="New Members" data-content="annotation text goes here" data-placement="bottom">?</a></sup>

However, when I pass the above html as the Highcharts chart title text attribute, Highcharts does not display it properly, it in fact displays the html text.

Is it possible to make this work using Highcharts interface? If so, how?

Any other suggestions would be appreciated.

Thanks.

Answer 1

The following works:

title: {
    useHTML: true,
    text: 'This is <b>bold</b>'
}

The useHtml property doesn't seem to be in the documentation that I can see but it seems to work for me and it also works on labels