The in attribute identifies input for the given filter primitive.

The letter-spacing attribute controls spacing between text characters.

A capturing group groups a subpattern, allowing you to apply a quantifier to the entire group or use disjunctions within it. It memorizes information about the subpattern match, so that you can refer back to it later with a backreference, or access the information through the match results.

An arrow function expression is a compact alternative to a traditional function expression, with some semantic differences and deliberate limitations in usage:

The greater than or equal (>=) operator returns true if the left operand is greater than or equal to the right operand, and false otherwise.

A quantifier repeats an atom a certain number of times. The quantifier is placed after the atom it applies to.

The static import declaration is used to import read-only live bindings which are exported by another module. The imported bindings are called live bindings because they are updated by the module that exported the binding, but cannot be re-assigned by the importing module.

The Uint32Array typed array represents an array of 32-bit unsigned integers in the platform byte order. If control over byte order is needed, use DataView instead. The contents are initialized to 0 unless initialization data is explicitly provided. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).

The Int8Array typed array represents an array of 8-bit signed integers. The contents are initialized to 0 unless initialization data is explicitly provided. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).

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.