The <path> SVG element is the generic element to define a shape. All the basic shapes can be created with a path element.

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

The decodeURIComponent() function decodes a Uniform Resource Identifier (URI) component previously created by encodeURIComponent() or by a similar routine.

The color attribute is used to provide a potential indirect value, currentcolor, for the fill, stroke, stop-color, flood-color, and lighting-color attributes.

The NaN global property is a value representing Not-A-Number.

A non-capturing group groups a subpattern, allowing you to apply a quantifier to the entire group or use disjunctions within it. It acts like the grouping operator in JavaScript expressions, and unlike capturing groups, it does not memorize the matched text, allowing for better performance and avoiding confusion when the pattern also contains useful capturing groups.

The alphabetic attribute defines the lower baseline of a font. It has the same syntax and semantics as the baseline descriptor within an @font-face.

The grouping ( ) operator controls the precedence of evaluation in expressions. It also acts as a container for arbitrary expressions in certain syntactic constructs, where ambiguity or syntax errors would otherwise occur.

The additive attribute controls whether or not an animation is additive.

Error objects are thrown when runtime errors occur. The Error object can also be used as a base object for user-defined exceptions. See below for standard built-in error types.