JavaScript typed arrays are array-like objects that provide a mechanism for reading and writing raw binary data in memory buffers.

There are situations where basic shapes do not provide the flexibility you need to achieve a certain effect. Drop shadows, to provide a popular example, cannot be created reasonably with a combination of gradients. Filters are SVG's mechanism to create sophisticated effects.

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

The assignment (=) operator is used to assign a value to a variable or property. The assignment expression itself has a value, which is the assigned value. This allows multiple assignments to be chained in order to assign a single value to multiple variables.

As an XML dialect, SVG is namespaced. It is important to understand the concept of namespaces and how they are used if you plan to author SVG content. Namespaces are essential to user agents that support multiple XML dialects; browsers must be very strict. Taking the time to understand namespaces now will save you from future headaches.

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.

The DisposableStack object represents a stack of disposers to run when the stack itself is disposed. Disposer functions are executed in reverse order of registration, with strong error handling guarantees. Calling its move() method will transfer responsibility for calling the current registered disposers to a new DisposableStack and prevent registering any additional disposers.

The <feColorMatrix> SVG filter element changes colors based on a transformation matrix. Every pixel's color value [R,G,B,A] is matrix multiplied by a 5 by 5 color matrix to create new color [R',G',B',A'].

The left shift (<<) operator returns a number or BigInt whose binary representation is the first operand shifted by the specified number of bits to the left. Excess bits shifted off to the left are discarded, and zero bits are shifted in from the right.

SVG elements can be modified using attributes that specify details about exactly how the element should be handled or rendered.