Perhaps more exciting than just fills and strokes is the fact that you can also create and apply gradients as either fills or strokes.

The accent-height attribute defines the distance from the origin to the top of accent characters, measured by a distance within the font coordinate system.

The <feMorphology> SVG filter primitive is used to erode or dilate the input image. Its usefulness lies especially in fattening or thinning effects.

Number values represent floating-point numbers like 37 or -9.25.

The <mpath> sub-element for the <animateMotion> element provides the ability to reference an external <path> element as the definition of a motion path.

The class keyword can be used to define a class inside an expression.

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

The addition assignment (+=) operator performs addition (which is either numeric addition or string concatenation) on the two operands and assigns the result to the left operand.

The Math namespace object contains static properties and methods for mathematical constants and functions.

The isFinite() function determines whether a value is finite, first converting the value to a number if necessary. A finite number is one that's not NaN or ±Infinity. Because coercion inside the isFinite() function can be surprising, you may prefer to use Number.isFinite().