The intercept attribute defines the intercept of the linear function of color component transfers when the type attribute is set to linear.

The image-rendering attribute provides a hint to the browser about how to make speed vs. quality tradeoffs as it performs image processing.

The k3 attribute defines one of the values to be used within the arithmetic operation of the <feComposite> filter primitive.

The unicode-bidi attribute specifies how the accumulation of the background image is managed.

The strikethrough-thickness attribute represents the ideal thickness of the strikethrough. The strikethrough thickness is expressed in the font's coordinate system.

The requiredFeatures attribute takes a list of feature strings, with the individual strings separated by white space. It determines whether or not all of the named features are supported by the browser; if all of them are supported, the attribute evaluates to true end the element is rendered; otherwise, the attribute evaluates to false and the current element and its children are skipped and thus will not be rendered. This provides a way to design SVG that gracefully falls back when features aren't available.

The maskUnits attribute indicates which coordinate system to use for the geometry properties of the <mask> element.

The vert-origin-x attribute indicates the x-coordinate in the font coordinate system of the origin of a glyph to be used when drawing vertically oriented text.

The viewBox attribute defines the position and dimension, in user space, of an SVG viewport.

The repeatDur attribute specifies the total duration for repeating an animation.