Hi. We will present an experimental IDE for navigating the ECMAScript specification document. The IDE provides a custom pseudocode notation that matches the look-and-feel of the ECMA-262 spec, and supports the usual features (outline view, go to definition, find usages, diff). We'll also demo functionality for advanced navigation and comprehension of pseudocode, such as pattern-based code search within the spec's algorithms, and local refactoring/modifying/annotating the spec for learning purposes.