The JavaScript exception "No Promise in Promise.any was resolved" occurs when all promises passed to Promise.any() are rejected. It is the only built-in usage of AggregateError.

The with statement extends the scope chain for a statement.

The for await...of statement creates a loop iterating over async iterable objects as well as sync iterables. This statement can only be used in contexts where await can be used, which includes inside an async function body and in a module.

This page describes JavaScript's lexical grammar. JavaScript source text is just a sequence of characters — in order for the interpreter to understand it, the string has to be parsed to a more structured representation. The initial step of parsing is called lexical analysis, in which the text gets scanned from left to right and is converted into a sequence of individual, atomic input elements. Some input elements are insignificant to the interpreter, and will be stripped after this step — they include white space and comments. The others, including identifiers, keywords, literals, and punctuators (mostly operators), will be used for further syntax analysis. Line terminators and multiline comments are also syntactically insignificant, but they guide the process for automatic semicolons insertion to make certain invalid token sequences become valid.

The JavaScript exception "repeat count must be less than infinity" occurs when the String.prototype.repeat() method is used with a count argument that is infinity.

The JavaScript exception "super() is only valid in derived class constructors" occurs when the super() call is used somewhere that's not the body of a constructor in a class with extends keyword.

The values attribute has different meanings, depending upon the context where it's used, either it defines a sequence of values used over the course of an animation, or it's a list of numbers for a color matrix, which is interpreted differently depending on the type of color change to be performed.

The JavaScript exception "invalid assignment left-hand side" occurs when there was an unexpected assignment somewhere. It may be triggered when a single = sign was used instead of == or ===.

The xml:lang attribute specifies the primary language used in contents and attributes containing text content of particular elements.

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.