Scalable Vector Graphics, SVG, is a W3C XML dialect to mark up graphics.

The JavaScript exception "missing name after . operator" occurs when there is a problem with how the dot operator (.) is used for property access.

The u1 attribute specifies list of Unicode characters (refer to the description of the unicode attribute of the <glyph> element for a description of how to express individual Unicode characters) and/or ranges of Unicode characters, which identify a set of possible first glyph in a kerning pair.

The JavaScript exception "redeclaration of formal parameter" occurs when the same variable name occurs as a function parameter and is then redeclared using a let assignment in a function body again.

The vector-effect property specifies the vector effect to use when drawing an object. Vector effects are applied before any of the other compositing operations, i.e. filters, masks and clips.

The units-per-em attribute specifies the number of coordinate units on the "em square", an abstract square whose height is the intended distance between lines of type in the same type size. This is the size of the design grid on which glyphs are laid out.

The stroke-width attribute is a presentation attribute defining the width of the stroke to be applied to the shape.

The split() method of String values takes a pattern and divides this string into an ordered list of substrings by searching for the pattern, puts these substrings into an array, and returns the array.

The x1 attribute is used to specify the first x-coordinate for drawing an SVG element that requires more than one coordinate. Elements that only need one coordinate use the x attribute instead.

The JavaScript exception "cannot use ?? unparenthesized within || and && expressions" occurs when an nullish coalescing operator is used with a logical OR or logical AND in the same expression without parentheses.