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 stroke-dashoffset attribute is a presentation attribute defining an offset on the rendering of the associated dash array.

The JavaScript exception "SyntaxError: private fields can't be deleted" occurs when delete is used on a private property of a class or an object.

The JavaScript exception "invalid Array.prototype.sort argument" occurs when the argument of Array.prototype.sort() isn't either undefined or a function which compares its operands.

The x attribute defines an x-axis coordinate in the user coordinate system.

The visibility attribute lets you control the visibility of graphical elements. With a value of hidden or collapse the current graphics element is invisible.

The xChannelSelector attribute indicates which color channel from in2 to use to displace the pixels in in along the x-axis.

The stdDeviation attribute defines the standard deviation for the blur operation.

The JavaScript exception "unlabeled break must be inside loop or switch" occurs when a break statement is not inside a loop or a switch statement.

The fill() method of Array instances changes all elements within a range of indices in an array to a static value. It returns the modified array.