The InternalError object indicates an error that occurred internally in the JavaScript engine.

The decoding attribute, valid on <image> elements, provides a hint to the browser as to whether it should perform image decoding along with rendering other content in a single presentation step that looks more "correct" (sync), or render and present the other content first and then decode the image and present it later (async). In practice, async means that the next paint does not wait for the image to decode.

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

The constructor method is a special method of a class for creating and initializing an object instance of that class.

The Math namespace object contains static properties and methods for mathematical constants and functions.

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 font-variant attribute indicates whether the text is to be rendered using variations of the font's glyphs.

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

The k1 attribute defines one of the values to be used within the arithmetic operation of the <feComposite> filter primitive.

The dominant-baseline attribute specifies the dominant baseline, which is the baseline used to align the box's text and inline-level contents. It also indicates the default alignment baseline of any boxes participating in baseline alignment in the box's alignment context.