Office Chart Tags are Tags that look and behave like a Microsoft Office chart. These Tags are only available in Word 2007+ DOCX templates. The output of an Office Chart Tag is an Office chart for DOCX, and a bitmap image for other output formats.

The Chart Tag has existed since long before there was support for Office Chart Tags and Native Charts, and it is still an option. It is the only option in Excel templates. The output of a Classic Chart Tag is always a bitmap image. The Tag Editor for Classic Chart Tags is the same as the advanced Tag Editor for Office Chart Tags, but it also contains formatting pages.

Native charts are regular Microsoft Office charts. These charts are only available in Word and Excel 2007+ DOCX and XLSX templates. The output of a native chart is an Office chart if the output format is the same as the template format. Otherwise the output is a bitmap image. 

Charts in the template that are native Office charts rather than Chart Tags are now included in the output:

• If the output type matches the template type (DOCX, XLSX or PPTX), it's an Office chart and will appear exactly as it did in the template.
• If the output format is not Office, it gives a close approximation and is rendered as a PDF chart.