A named backreference refers to the submatch of a previous named capturing group and matches the same text as that group. For unnamed capturing groups, you need to use the normal backreference syntax.

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

The new operator lets developers create an instance of a user-defined object type or of one of the built-in object types that has a constructor function.

The unary negation (-) operator precedes its operand and negates it.

The targetY attribute determines the positioning in vertical direction of the convolution matrix relative to a given target pixel in the input image. The topmost row of the matrix is row number zero. The value must be such that: 0 <= targetY < y of order.

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.

The stop-opacity attribute defines the opacity of a given color gradient stop.

The JavaScript exception "await is only valid in async functions, async generators and modules" occurs when an await expression is used outside of async functions or modules or other async contexts.

The x attribute defines an x-axis coordinate in the user coordinate system.

The target attribute should be used when there are multiple possible targets for the ending resource, such as when the parent document is embedded within an HTML or XHTML document, or is viewed with a tabbed browser. This attribute specifies the name of the browsing context (e.g., a browser tab or an (X)HTML iframe or object element) into which a document is to be opened when the link is activated: