The JavaScript exception "await expression can't be used in parameter" or "yield expression can't be used in parameter" occurs when the default parameter expression contains the await or yield keyword and has the effect of pausing default parameter evaluation.

The paint-order attribute specifies the order that the fill, stroke, and markers of a given shape or text element are painted.

The y attribute defines a y-axis coordinate in the user coordinate system.

The remainder (%) operator returns the remainder left over when one operand is divided by a second operand. It always takes the sign of the dividend.

The JavaScript exception "TypeError: already executing generator" occurs when a generator is continued using one of its methods (such as next()) while executing the generator function's body itself.

The JavaScript exceptions "unexpected token" occur when the parser does not see a token it recognizes at the given position, so it cannot make sense of the structure of the program. This might be a simple typo.

Created with the method `rsplitn`.

Trailing commas (sometimes called "final commas") can be useful when adding new elements, parameters, or properties to JavaScript code. If you want to add a new property, you can add a new line without modifying the previously last line if that line already uses a trailing comma. This makes version-control diffs cleaner and editing code might be less troublesome.

The JavaScript exception "WeakSet key (or WeakMap value) 'x' must be an object or an unregistered symbol" occurs when a value of invalid type is used as a key in a WeakSet or as a value in a WeakMap.

Created with the method `rmatches`.