The replaceAll() method of String values returns a new string with all matches of a pattern replaced by a replacement. The pattern can be a string or a RegExp, and the replacement can be a string or a function to be called for each match. The original string is left unchanged.

The toUpperCase() method of String values returns this string converted to uppercase.

The next() method of AsyncGenerator instances returns the next value in the sequence.

The JavaScript exception "called on incompatible target (or object)" occurs when a function (on a given object), is called with a this not corresponding to the type expected by the function.

The JavaScript warning "test for equality (==) mistyped as assignment (=)?" occurs when there was an assignment (=) when you would normally expect a test for equality (==).

The JavaScript exception "missing } after property list" occurs when there is a mistake in the object initializer syntax somewhere. Might be in fact a missing curly bracket, but could also be a missing comma.

The Number.MIN_SAFE_INTEGER static data property represents the minimum safe integer in JavaScript, or -(253 - 1).

The Number.MAX_SAFE_INTEGER static data property represents the maximum safe integer in JavaScript (253 – 1).

The Object.defineProperty() static method defines a new property directly on an object, or modifies an existing property on an object, and returns the object.

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.