The <ellipse> SVG element is an SVG basic shape, used to create ellipses based on a center coordinate, and both their x and y radius.

The do...while statement creates a loop that executes a specified statement as long as the test condition evaluates to true. The condition is evaluated after executing the statement, resulting in the specified statement executing at least once.

The media attribute specifies a media query that must be matched for a style sheet to apply.

The limitingConeAngle attribute represents the angle in degrees between the spot light axis (i.e., the axis between the light source and the point to which it is pointing at) and the spot light cone. So it defines a limiting cone which restricts the region where the light is projected. No light is projected outside the cone.

The href attribute defines a link to a resource as a reference URL. The exact meaning of that link depends on the context of each element using it.

The marker-start attribute defines the arrowhead or polymarker that will be drawn at the first vertex of the given shape.

The <line> SVG element is an SVG basic shape used to create a line connecting two points.

The <title> SVG element provides an accessible, short-text description of any SVG container element or graphics element.

The typeof operator returns a string indicating the type of the operand's value.

The <animate> SVG element provides a way to animate an attribute of an element over time.