The eval() function evaluates JavaScript code represented as a string and returns its completion value. The source is parsed as a script.

The divisor attribute specifies the value by which the resulting number of applying the kernelMatrix of a <feConvolveMatrix> element to the input image color value is divided to yield the destination color value.

A mutual exclusion primitive useful for protecting shared data

The set syntax binds an object property to a function to be called when there is an attempt to set that property. It can also be used in classes.

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.

Symbol is a built-in object whose constructor returns a symbol primitive — also called a Symbol value or just a Symbol — that's guaranteed to be unique. Symbols are often used to add unique property keys to an object that won't collide with keys any other code might add to the object, and which are hidden from any mechanisms other code will typically use to access the object. That enables a form of weak encapsulation, or a weak form of information hiding.

The flood-color attribute indicates what color to use to flood the current filter primitive subregion.

Function pointers, like `fn(usize) -> bool`.

The dy attribute indicates a shift along the y-axis on the position of an element or its content.

Utilities for the slice primitive type.