"There are many existing web features and technologies in the wild that you may never touch directly in your day-to-day work. Perhaps you're fairly new to web development and are simply unaware of them because you're steeped in the abstraction of a specific framework that doesn't require you to know it deeply, or even at all. Bryan Rasmussen looks specifically at XPath and demonstrates how it can be used alongside CSS to query elements."
"It is, of course, perfectly understandable to not know something. The web is a very big place with a diverse set of skills and specialties, and we don't always know what we don't know. Learning in this field is an ongoing journey rather than something that happens once and ends. Case in point: Someone on my team asked if it was possible to tell if users navigate away from a particular tab in the UI."
Many web features and technologies exist that developers may never use directly. Newer developers can be unaware because frameworks abstract complexity and remove need to learn underlying APIs. Experience from other projects often reveals browser features such as XPath, CSSOM, beforeunload, and visibilitychange, which solve specific UI needs like detecting tab navigation and unsaved changes. Front-end frameworks build on older technologies and sometimes obscure essential front-end concepts. Ongoing learning and exposure to varied projects help developers acquire practical knowledge not taught by abstractions alone. Hands-on familiarity with legacy browser APIs can improve debugging, interoperability, and implementation choices.
Read at Smashing Magazine
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