The markerWidth attribute represents the width of the viewport into which the <marker> is to be fitted when it is rendered according to the viewBox and preserveAspectRatio attributes.

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The <use> element takes nodes from within an SVG document, and duplicates them somewhere else. The effect is the same as if the nodes were deeply cloned into a non-exposed DOM, then pasted where the <use> element is, much like cloned <template> elements.

The cursor attribute specifies the mouse cursor displayed when the mouse pointer is over an element.

The bitwise OR assignment (|=) operator performs bitwise OR on the two operands and assigns the result to the left operand.

Symbol is a built-in object whose constructor returns a symbol primitive — also called a Symbol value or just a Symbol — that's guaranteed to be unique. Symbols are often used to add unique property keys to an object that won't collide with keys any other code might add to the object, and which are hidden from any mechanisms other code will typically use to access the object. That enables a form of weak encapsulation, or a weak form of information hiding.

Suspend execution until the result of a `Future` is ready.

The right shift assignment (>>=) operator performs right shift on the two operands and assigns the result to the left operand.

Prints to the standard output, with a newline.

Declare a new thread local storage key of type `std::thread::LocalKey`.