The JavaScript strict mode-only exception "for-in loop head declarations may not have initializers" occurs when the head of a for...in contains an initializer expression, such as for (var i = 0 in obj). This is not allowed in for-in loops in strict mode. In addition, lexical declarations with initializers like for (const i = 0 in obj) are not allowed outside strict mode either.

The set syntax binds an object property to a function to be called when there is an attempt to set that property. It can also be used in classes.

The fill-rule attribute is a presentation attribute defining the algorithm to use to determine the inside part of a shape.

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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 patternTransform attribute defines a list of transform definitions that are applied to a pattern tile.

The URIError object represents an error when a global URI handling function was used in a wrong way.

Method definition is a shorter syntax for defining a function property in an object initializer. It can also be used in classes.

The shape-rendering attribute provides hints to the renderer about what tradeoffs to make when rendering shapes like paths, circles, or rectangles.

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