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The maskContentUnits attribute indicates which coordinate system to use for the contents of the <mask> element.

Default function parameters allow named parameters to be initialized with default values if no value or undefined is passed.

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.

The font-family attribute indicates which font family will be used to render the text, specified as a prioritized list of font family names and/or generic family names.

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The 8-bit unsigned integer type.

A fixed-size array, denoted `[T; N]`, for the element type, `T`, and the non-negative compile-time constant size, `N`.

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 kernelUnitLength attribute has two meanings based on the context it's used in. For lighting filter primitives, it indicates the intended distance for the x and y coordinates, for <feConvolveMatrix>, it indicates the intended distance between successive columns and rows in the kernel matrix.