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

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 <feColorMatrix> SVG filter element changes colors based on a transformation matrix. Every pixel's color value [R,G,B,A] is matrix multiplied by a 5 by 5 color matrix to create new color [R',G',B',A'].

The <feFuncB> SVG filter primitive defines the transfer function for the blue component of the input graphic of its parent <feComponentTransfer> element.

Now that we covered the basics of the SVG internals, we will take a look at some tools to work with SVG files.