The <feBlend> SVG filter primitive composes two objects together ruled by a certain blending mode. This is similar to what is known from image editing software when blending two layers. The mode is defined by the mode attribute.

When SVG was specified, support for web fonts was not widespread in browsers. Since accessing the correct font file is crucial for rendering text correctly, a font description technology was added to SVG to provide this ability. It was implemented as a means of embedding glyph information into SVG when rendered.

The Atomics namespace object contains static methods for carrying out atomic operations. They are used with SharedArrayBuffer and ArrayBuffer objects.

SVG is an XML language, similar to XHTML, which can be used to draw vector graphics, such as the one shown below. It can be used to create an image either by specifying all the lines and shapes necessary, by modifying already existing raster images, or by a combination of both. The image and its components can also be transformed, composited together, or filtered to change their appearance completely.

BigInt values represent numeric values which are too large to be represented by the number primitive.

The JavaScript reference serves as a repository of facts about the JavaScript language. The entire language is described here in detail. As you write JavaScript code, you'll refer to these pages often (thus the title "JavaScript reference").

The <animate> SVG element provides a way to animate an attribute of an element over time.

The ArrayBuffer object is used to represent a generic raw binary data buffer.

JavaScript is a multi-paradigm, dynamic language with types and operators, standard built-in objects, and methods. Its syntax is based on the Java and C languages — many structures from those languages apply to JavaScript as well. JavaScript supports object-oriented programming with object prototypes and classes. It also supports functional programming since functions are first-class objects that can be easily created via expressions and passed around like any other object.

This chapter introduces JavaScript and discusses some of its fundamental concepts.