These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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When the title is too wide to fit in the chart, the default behavior
is to scale it down to fit, or apply word wrap if it is scaled down
to minScale and still doesn't fit.
The default value reflects the scale, when using default font sizes, when the title font size matches that of the subtitle. The title still stands out as it is bold by default.
Set minScale to 1 to avoid downscaling.