A wildcard matches all characters except line terminators. It also matches line terminators if the s flag is set.

The in attribute identifies input for the given filter primitive.

An input boundary assertion checks if the current position in the string is an input boundary. An input boundary is the start or end of the string; or, if the m flag is set, the start or end of a line.

A backreference refers to the submatch of a previous capturing group and matches the same text as that group. For named capturing groups, you may prefer to use the named backreference syntax.

The width attribute defines the horizontal length of an element in the user coordinate system.

The JavaScript warning "Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead" occurs when there is a deprecated source map syntax in a JavaScript source.

The unicode attribute specifies one or more Unicode characters indicating the sequence of Unicode characters which corresponds to a glyph.

The JavaScript exception "radix must be an integer at least 2 and no greater than 36" occurs when the optional radix parameter of the Number.prototype.toString() or the BigInt.prototype.toString() method was specified and is not between 2 and 36.

The seed attribute represents the starting number for the pseudo random number generator of the <feTurbulence> filter primitive.

The JavaScript strict mode-only exception "deprecated caller or arguments usage" occurs when the deprecated Function.prototype.caller or Function.prototype.arguments properties are used.