Highcharts charts svg should be rendered using htmlunit-driver same as it is any other browser like chrome, edge, firefox etc

Charts rendered are too small. Generated svg has a few NaN in the width attributes of couple rect tags. Moreover linearGradient and clipPath tags are all lowercased.

Live demo with steps to reproduce
I have copied my sample project jdoodle. But it is not able to download maven dependencies. Anyways you can check my code for reference and copy the project to your local to run it:

https://www.jdoodle.com/ia/BEk

Attachment: highcharts_htmlunit_test.zip
All the source files needed to run the sample project as zip file. Because java, js and pom files cannot be uploaded here.

Brief structure of my example project:

• highcharts-export.html (My custom html file to be used by htmlunitt)
• highcharts-export.js (My custom js file to be used by htmlunit)
• highcharts and highcharts-more js files
• HighchartsExport.java the java code which uses selenium and htmlunit to execute the above html/js code to generate highcharts chart.
  maven deps:

  <dependencies>
    <dependency>
      <groupId>org.seleniumhq.selenium</groupId>
      <artifactId>selenium-java</artifactId>
      <version>4.7.2</version>
    </dependency>
    <dependency>
      <groupId>org.seleniumhq.selenium</groupId>
      <artifactId>htmlunit-driver</artifactId>
      <version>4.7.2</version>
    </dependency>
  </dependencies>

Product version
highcharts.js 10.3.2 (also tried with 8.2.2)
highcharts-more.js 10.3.2 (also tried with 8.2.2)

Affected browser(s)
htmlunit

I have opened same html/js files in chrome, and chart is rendered correctly there.
Also tried same code with ChromeDriver, it is generating the chart correctly