The Reflect namespace object contains static methods for invoking interceptable JavaScript object internal methods. The methods are the same as those of proxy handlers.

Regular expressions are patterns used to match character combinations in strings. In JavaScript, regular expressions are also objects. These patterns are used with the exec() and test() methods of RegExp, and with the match(), matchAll(), replace(), replaceAll(), search(), and split() methods of String. This chapter describes JavaScript regular expressions. It provides a brief overview of each syntax element. For a detailed explanation of each one's semantics, read the regular expressions reference.

The font-size-adjust attribute allows authors to specify an aspect value for an element that will preserve the x-height of the first choice font in a substitute font.

The limitingConeAngle attribute represents the angle in degrees between the spot light axis (i.e. the axis between the light source and the point to which it is pointing at) and the spot light cone. So it defines a limiting cone which restricts the region where the light is projected. No light is projected outside the cone.

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

The attributeName attribute indicates the name of the CSS property or attribute of the target element that is going to be changed during an animation.

The logical AND assignment (&&=) operator only evaluates the right operand and assigns to the left if the left operand is truthy.

The new operator lets developers create an instance of a user-defined object type or of one of the built-in object types that has a constructor function.

The horiz-adv-x attribute indicates the horizontal advance after rendering a glyph in horizontal orientation.

The orient attribute indicates how a marker is rotated when it is placed at its position on the shape.