This extension optimizes the SVG file according to the following options:
* Shorten color names: convert all colors to #RRGGBB or #RGB format.
* Convert CSS attributes to XML attributes: convert styles from style tags and inline style="" declarations into XML attributes.
* Group collapsing: removes useless g elements, promoting their contents up one level. Requires "Remove unused ID names for elements" to be set.
* Create groups for similar attributes: create g elements for runs of elements having at least one attribute in common (e.g. fill color, stroke opacity, ...).
* Embed rasters: embed raster images as base64-encoded data URLs.
* Keep editor data: don't remove Inkscape, Sodipodi or Adobe Illustrator elements and attributes.
* Remove metadata: remove metadata tags along with all the information in them, which may include license metadata, alternate versions for non-SVG-enabled browsers, etc.
* Remove comments: remove comment tags.
* Work around renderer bugs: emits slightly larger SVG data, but works around a bug in librsvg's renderer, which is used in Eye of GNOME and other various applications.
* Enable viewboxing: size image to 100%/100% and introduce a viewBox.
* Number of significant digits for coords: all coordinates are output with that number of significant digits. For example, if 3 is specified, the coordinate 3.5153 is output as 3.51 and the coordinate 471.55 is output as 472.
* XML indentation (pretty-printing): either None for no indentation, Space to use one space per nesting level, or Tab to use one tab per nesting level.
