Approaches, techniques, and mechanisms are disclosed for flexible and dynamic modification of elements within textual content to provide an enhanced interface for development or other activities with respect to those elements. In an embodiment, the elements may be augmented with links by which users may quickly access associated items in development tools or other resources. For example, in an embodiment, the elements may be specific lines or blocks of code mentioned in a stack trace or error message. The elements may be transformed into links that, for instance, open the file containing the mentioned line or block of code, and optionally scroll specifically to the mentioned line or block of code. In an embodiment, the elements are specific passages within web pages that match trigger conditions specified by rules encapsulated in a user-customizable client-side plug-in, extensions, or bookmarklet. Proxy-based or server-based implementations may also be used.