The import attributes feature instructs the runtime about how a module should be loaded, including the behavior of module resolution, fetching, parsing, and evaluation. It's supported in import declarations, export...from declarations, and dynamic import().

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The JavaScript strict mode-only exception "setting getter-only property" occurs when there is an attempt to set a new value to a property for which only a getter is specified, or when setting a private accessor property that similarly only has a getter defined.

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The extends keyword is used in class declarations or class expressions to create a class that is a child of another class.

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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:

The JavaScript exception "missing variable name" is a common error. It is usually caused by omitting a variable name or a typographic error.