You can set a cssClass to the tooltip (see How to Use => Tooltip Options), and in the cssClass style settings, you can use the absolute font size unit: rem.
rem values are relative to the root html element.
For example, you can set your tooltip.js:
var tooltipOptions= {
...
cssClass: "tooltip123",
...,
license: "mylicense"
};
and in your CSS:
.tooltip123 {
font-size: 1.2rem;
}
Please have a try.
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