The r attribute defines the radius of a circle.

The JavaScript exception "can't access private field or method: object is not the right class" or "can't set private field: object is not the right class" occurs when a private field or method is get or set on an object that does not have this private element defined.

The fr attribute defines the radius of the focal point for the radial gradient.

The order attribute indicates the size of the matrix to be used by a <feConvolveMatrix> element.

The JavaScript exception "character class escape cannot be used in class range in regular expression" occurs when a Unicode-aware regular expression pattern contains a character class where a boundary of a character range is another character class, such as a character class escape.

The writing-mode attribute specifies whether the initial inline-progression-direction for a <text> element shall be left-to-right, right-to-left, or top-to-bottom. The writing-mode attribute applies only to <text> elements; the attribute is ignored for <tspan> and <textPath> sub-elements. (Note that the inline-progression-direction can change within a <text> element due to the Unicode bidirectional algorithm and properties direction and unicode-bidi.)

The JavaScript exception "missing } after function body" occurs when there is a syntax mistake when creating a function somewhere. Check if any closing curly braces or parenthesis are in the correct order.

The slope attribute defines the values for linear filters, such as brightness.

The multiplication (*) operator produces the product of the operands.

The using declaration declares block-scoped local variables that are synchronously disposed. Like const, variables declared with using must be initialized and cannot be reassigned. The variable's value must be either null, undefined, or an object with a [Symbol.dispose]() method. When the variable goes out of scope, the [Symbol.dispose]() method of the object is called, to ensure that resources are freed.