The glyph-orientation-vertical attribute affects the amount that the current text position advances as each glyph is rendered.

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 diffuseConstant attribute represents the kd value in the Phong lighting model. In SVG, this can be any non-negative number.

The fy attribute defines the y-axis coordinate of the focal point for a radial gradient.

The glyph-orientation-horizontal attribute affects the amount that the current text position advances as each glyph is rendered.

The JavaScript exception "missing ) after condition" occurs when there is an error with how an if condition is written. It must appear in parenthesis after the if keyword.

Functions are one of the fundamental building blocks in JavaScript. A function in JavaScript is similar to a procedure—a set of statements that performs a task or calculates a value, but for a procedure to qualify as a function, it should take some input and return an output where there is some obvious relationship between the input and the output. To use a function, you must define it somewhere in the scope from which you wish to call it.

Boolean values can be one of two values: true or false, representing the truth value of a logical proposition.

The <mask> SVG element defines a mask for compositing the current object into the background. A mask is used/referenced using the mask property and CSS mask-image property.

The if...else statement executes a statement if a specified condition is truthy. If the condition is falsy, another statement in the optional else clause will be executed.