The conditional (ternary) operator is the only JavaScript operator that takes three operands: a condition followed by a question mark (?), then an expression to execute if the condition is truthy followed by a colon (:), and finally the expression to execute if the condition is falsy. This operator is frequently used as an alternative to an if...else statement.

The <mpath> sub-element for the <animateMotion> element provides the ability to reference an external <path> element as the definition of a motion path.

The bitwise OR assignment (|=) operator performs bitwise OR on the two operands and assigns the result to the left operand.

The by attribute specifies a relative offset value for an attribute that will be modified during an animation.

The <metadata> SVG element adds metadata to SVG content. Metadata is structured information about data. The contents of <metadata> should be elements from other XML namespaces such as RDF, FOAF, etc.

Number values represent floating-point numbers like 37 or -9.25.

The delete operator removes a property from an object. If the property's value is an object and there are no more references to the object, the object held by that property is eventually released automatically.

Method definition is a shorter syntax for defining a function property in an object initializer. It can also be used in classes.

A character class matches any character in or not in a custom set of characters. When the v flag is enabled, it can also be used to match finite-length strings.

The <use> element takes nodes from within the SVG document, and duplicates them somewhere else. The effect is the same as if the nodes were deeply cloned into a non-exposed DOM, then pasted where the use element is, much like cloned template elements.