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NOTE: Couldn't find an option in the drop down for Word processing.
How to reproduce:
Create a Word document with MS Word that has text highlighted in the first green (green 1 below):

Create a DLS.WordDocument from it:
Syncfusion.DocIO.DLS.WordDocument doc = new Syncfusion.DocIO.DLS.WordDocument(MemoryStream, FormatType.Docx);
doc.Save(MemoryStream, FormatType.Html);
View the html in a browser. green 2 and green 3 come through correctly. green 1 does not.

Open the original Word document and Save it as html. Examine the html and you'll see 'green 1' is lime (#00FF00):

