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.

A WeakMap is a collection of key/value pairs whose keys must be objects or non-registered symbols, with values of any arbitrary JavaScript type, and which does not create strong references to its keys. That is, an object's presence as a key in a WeakMap does not prevent the object from being garbage collected. Once an object used as a key has been collected, its corresponding values in any WeakMap become candidates for garbage collection as well — as long as they aren't strongly referred to elsewhere. The only primitive type that can be used as a WeakMap key is symbol — more specifically, non-registered symbols — because non-registered symbols are guaranteed to be unique and cannot be re-created.

The exponentiation assignment (**=) operator performs exponentiation on the two operands and assigns the result to the left operand.

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SVG drawings and images are created using a wide array of elements which are dedicated to the construction, drawing, and layout of vector images and diagrams. Here you'll find reference documentation for each of the SVG elements.

The greater than (>) operator returns true if the left operand is greater than the right operand, and false otherwise.

Now we're ready to start distorting our beautiful images. But first, let's formally introduce the <g> element. With this helper, you can assign properties to a complete set of elements. Actually, that's its only purpose.

The var statement declares function-scoped or globally-scoped variables, optionally initializing each to a value.

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