A regular expression (regex for short) allow developers to match strings against a pattern, extract submatch information, or simply test if the string conforms to that pattern. Regular expressions are used in many programming languages, and JavaScript's syntax is inspired by Perl.

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 pathLength attribute lets authors specify a total length for the path, in user units. This value is then used to calibrate the browser's distance calculations with those of the author, by scaling all distance computations using the ratio pathLength / (computed value of path length).

The mathematical attribute indicates the alignment coordinate for glyphs to achieve mathematical baseline alignment for horizontally oriented glyph layouts. The value is an offset in the font coordinate system.

The media attribute specifies a media query that must be matched for a style sheet to apply.

The export declaration is used to export values from a JavaScript module. Exported values can then be imported into other programs with the import declaration or dynamic import. The value of an imported binding is subject to change in the module that exports it — when a module updates the value of a binding that it exports, the update will be visible in its imported value.

An owned, mutable path (akin to `String`).

An owning iterator over the items of a `HashSet`.

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