Option to convert Visio diagram to SVG image when displaying on browsers not capable of running the Internet Explorer (IE) Visio viewer control. This includes mobile devices using the Confluence mobile support.
This requires Image Conversion Support. An add-on configuration option allows the Confluence administrator to set the default behavior so all existing macros can take advantage of the support immediately.
SVG support is available in most modern browsers according to Wikipedia:
Converted Visio diagram can be saved at an attachment for other use or improve display performance using the Cache Macro. This requires Image Conversion Support
Image Conversion Support
Some improvements included here require the installation of a conversion program. The Confluence administrator will need to install conversion program on the Confluence server.