A non-capturing group groups a subpattern, allowing you to apply a quantifier to the entire group or use disjunctions within it. It acts like the grouping operator in JavaScript expressions, and unlike capturing groups, it does not memorize the matched text, allowing for better performance and avoiding confusion when the pattern also contains useful capturing groups.

The rotate attribute specifies how the animated element rotates as it travels along a path specified in an <animateMotion> element.

The result attribute defines the assigned name for this filter primitive. If supplied, then graphics that result from processing this filter primitive can be referenced by an in attribute on a subsequent filter primitive within the same <filter> element. If no value is provided, the output will only be available for re-use as the implicit input into the next filter primitive if that filter primitive provides no value for its in attribute.

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

The JavaScript exception "can't access lexical declaration 'X' before initialization" occurs when a lexical variable was accessed before it was initialized. This happens within any scope (global, module, function, or block) when let or const variables are accessed before the place where they are declared is executed.

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 "unparenthesized unary expression can't appear on the left-hand side of '**'" occurs when a unary operator (one of typeof, void, delete, await, !, ~, +, -) is used on the left operand of the exponentiation operator without parentheses.

The style attribute allows to style an element using CSS declarations. It functions identically to the style attribute in HTML.

The spacing attribute indicates how the user agent should determine the spacing between typographic characters that are to be rendered along a path.

The stroke-dasharray attribute is a presentation attribute defining the pattern of dashes and gaps used to paint the outline of the shape.