The unicode-range attribute defines the range of ISO 10646 characters possibly covered by the glyphs in a font.

The xml:lang attribute specifies the primary language used in contents and attributes containing text content of particular elements.

The refY attribute defines the y coordinate of an element's reference point.

The zoomAndPan attribute specifies whether the SVG document can be magnified and panned.

SVG makes use of a number of data types. This article lists these types along with their syntax and descriptions of what they're used for.

The vector-effect property specifies the vector effect to use when drawing an object. Vector effects are applied before any of the other compositing operations, i.e. filters, masks and clips.

The x1 attribute is used to specify the first x-coordinate for drawing an SVG element that requires more than one coordinate. Elements that only need one coordinate use the x attribute instead.

Scalable Vector Graphics, SVG, is a W3C XML dialect to mark up graphics.

The u1 attribute specifies list of Unicode characters (refer to the description of the unicode attribute of the <glyph> element for a description of how to express individual Unicode characters) and/or ranges of Unicode characters, which identify a set of possible first glyph in a kerning pair.

The xlink:show attribute indicates how a linked resource should be opened and is meant for XLink-aware processors. In case of a conflict, the target attribute has priority, since it can express a wider range of values.