: URLs, HTTP, HTML, CSS, JavaScript (ECMAScript 2015+), JSON, and the DOM.
: The guide identifies varied roles including Front-End SEO Experts, Accessibility Experts, and Front-End DevOps . Front-end Developer Handbook 2017
: Use of task runners, build tools, package managers (like YARN), and scaffolding tools. Key Industry Context (2017) : URLs, HTTP, HTML, CSS, JavaScript (ECMAScript 2015+),