We would like to share with you that Aspose.HTML now supports JavaScript Execution. However, if you are using the latest versions of JS-libraries based on latest version of JS language standard you can face some issues. We are working to improve the support of JS language version and you are welcome to share the issues if you face some so that they can also be investigated and their fix can be incorporated in the API as well.
A post was split to a new topic: Is there any chance that Aspose.Words now supports JavaScript Execution when converting from HTML to DOCX/PDF?