The globalThis global property contains the global this value, which is usually akin to the global object.

The <ellipse> element is an SVG basic shape, used to create ellipses based on a center coordinate, and both their x and y radius.

The NaN global property is a value representing Not-A-Number.

There are several ways to color shapes (including specifying attributes on the object) using inline CSS, an embedded CSS section, or an external CSS file. Most SVG you'll find around the web use inline CSS, but there are advantages and disadvantages associated with each type.

The Proxy and Reflect objects allow you to intercept and define custom behavior for fundamental language operations (e.g. property lookup, assignment, enumeration, function invocation, etc.). With the help of these two objects you are able to program at the meta level of JavaScript.

The <feFuncR> SVG filter primitive defines the transfer function for the red component of the input graphic of its parent <feComponentTransfer> element.

The Symbol.unscopables static data property represents the well-known symbol @@unscopables. The with statement looks up this symbol on the scope object for a property containing a collection of properties that should not become bindings within the with environment.

SVG makes use of a number of data types. This article lists these types along with their syntax and descriptions of what they're used for.

The JavaScript exception "mismatched placement" occurs when a private getter and setter are mismatched in whether or not they are static.

The values attribute has different meanings, depending upon the context where it's used, either it defines a sequence of values used over the course of an animation, or it's a list of numbers for a color matrix, which is interpreted differently depending on the type of color change to be performed.