The let declaration declares re-assignable, block-scoped local variables, optionally initializing each to a value.

The image-rendering attribute provides a hint to the browser about how to make speed vs. quality tradeoffs as it performs image processing.

The keyPoints attribute indicates the simple duration of an animation.

The gradientTransform attribute contains the definition of an optional additional transformation from the gradient coordinate system onto the target coordinate system (i.e., userSpaceOnUse or objectBoundingBox). This allows for things such as skewing the gradient. This additional transformation matrix is post-multiplied to (i.e., inserted to the right of) any previously defined transformations, including the implicit transformation necessary to convert from object bounding box units to user space.

Operator precedence determines how operators are parsed concerning each other. Operators with higher precedence become the operands of operators with lower precedence.

The k attribute specifies the amount for decreasing the spacing between the two glyphs in a kerning pair.

The intercept attribute defines the intercept of the linear function of color component transfers when the type attribute is set to linear.

The void operator evaluates the given expression and then returns undefined.

A block statement is used to group zero or more statements. The block is delimited by a pair of braces ("curly braces") and contains a list of zero or more statements and declarations.

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