The <marker> SVG element defines a graphic used for drawing arrowheads or polymarkers on a given <path>, <line>, <polyline> or <polygon> element.

The JavaScript exception "must call super constructor before using 'this' in derived class constructor" occurs when the super() is not called for a given derived class constructor, and the derived constructor tries to access the value of this, or the derived constructor has already returned and the return value is not an object.

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

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 xlink:type attribute identifies the type of XLink being used. In SVG, only simple links are available.

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

A named backreference refers to the submatch of a previous named capturing group and matches the same text as that group. For unnamed capturing groups, you need to use the normal backreference syntax.

The tableValues attribute defines a list of numbers defining a lookup table of values for a color component transfer function.

The targetY attribute determines the positioning in vertical direction of the convolution matrix relative to a given target pixel in the input image. The topmost row of the matrix is row number zero. The value must be such that: 0 <= targetY < y of order.