The rotate attribute specifies how the animated element rotates as it travels along a path specified in an <animateMotion> element.

Below, you'll find a list of errors which are thrown by JavaScript. These errors can be a helpful debugging aid, but the reported problem isn't always immediately clear. The pages below will provide additional details about these errors. Each error is an object based upon the Error object, and has a name and a message.

The JavaScript exception "invalid 'instanceof' operand" occurs when the right-hand side operands of the instanceof operator isn't used with a constructor object, i.e., an object which has a prototype property and is callable.

The xlink:arcrole attribute specifies a contextual role for the element and corresponds to the RDF Primer notion of a property.

The JavaScript exception "use of super property/member accesses only valid within methods or eval code within methods" occurs when the super.x or super[x] syntax is used outside of a method.

The opacity attribute specifies the transparency of an object or of a group of objects, that is, the degree to which the background behind the element is overlaid.

The JavaScript exception "invalid Array.prototype.sort argument" occurs when the argument of Array.prototype.sort() (and its related methods: Array.prototype.toSorted(), TypedArray.prototype.sort(), TypedArray.prototype.toSorted()) isn't either undefined or a function which compares its operands.

The max attribute specifies the maximum value of the active animation duration.

Static initialization blocks are declared within a class. It contains statements to be evaluated during class initialization. This permits more flexible initialization logic than static properties, such as using try...catch or setting multiple fields from a single value. Initialization is performed in the context of the current class declaration, with access to private state, which allows the class to share information of its private elements with other classes or functions declared in the same scope (analogous to "friend" classes in C++).

The text-decoration attribute defines whether text is decorated with an underline, overline and/or strike-through. It is a shorthand for the text-decoration-line and text-decoration-style properties.