HTMLUnit currently includes support for Chart.js version 2.9.4 (https://github.com/HtmlUnit/htmlunit/tree/master/src/test/resources/libraries/chartjs/2.9.4) but the latest version is currently 4.4.3 (https://www.chartjs.org/docs/latest/api/).
Using the latest version of Chart.js should be possible, but fails with a JavaScript error ("redeclaration of const..."), that seems to be related to a rhino bug (mozilla/rhino#326).
HtmlUnit / htmlunit
HtmlUnit is a "GUI-Less browser for Java programs".
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