The arabic-form attribute indicates which of the four possible forms an Arabic glyph represents.

A block statement is used to group zero or more statements. The block is delimited by a pair of braces ("curly braces") and contains a list of zero or more statements and declarations.

The inequality (!=) operator checks whether its two operands are not equal, returning a Boolean result. Unlike the strict inequality operator, it attempts to convert and compare operands that are of different types.

The cy attribute defines the y-axis coordinate of a center point.

The parseInt() function parses a string argument and returns an integer of the specified radix (the base in mathematical numeral systems).

The font-stretch attribute indicates the desired amount of condensing or expansion in the glyphs used to render the text.

The from attribute indicates the initial value of the attribute that will be modified during the animation.

A literal character specifies exactly itself to be matched in the input text.

The let declaration declares re-assignable, block-scoped local variables, optionally initializing each to a value.

Boolean values can be one of two values: true or false, representing the truth value of a logical proposition.