The <font-face-uri> SVG element points to a remote definition of the current font.

The <foreignObject> SVG element includes elements from a different XML namespace. In the context of a browser, it is most likely (X)HTML.

The <marker> SVG element defines a graphic used for drawing arrowheads or polymarkers on a given <path>, <line>, <polyline> or <polygon> element.

The arabic-form attribute indicates which of the four possible forms an Arabic glyph represents.

The <font> SVG element defines a font to be used for text layout.

The fy attribute defines the y-axis coordinate of the focal point for a radial gradient.

The k attribute specifies the amount for decreasing the spacing between the two glyphs in a kerning pair.

The from attribute indicates the initial value of the attribute that will be modified during the animation.

The keyPoints attribute indicates the simple duration of an animation.

The gradientTransform attribute contains the definition of an optional additional transformation from the gradient coordinate system onto the target coordinate system (i.e., userSpaceOnUse or objectBoundingBox). This allows for things such as skewing the gradient. This additional transformation matrix is post-multiplied to (i.e., inserted to the right of) any previously defined transformations, including the implicit transformation necessary to convert from object bounding box units to user space.