Front-end Developer Handbook 2017

Don't learn jQuery, learn the DOM. Don't learn SASS, learn CSS. Don't learn HAML, learn HTML. Don't learn CoffeeScript, learn JavaScript. Don't learn Handlebars, learn JavaScript ES6 templates. Don't just use Bootstrap, learn UI patterns.

Cascading Style Sheets (CSS) is a style sheet language used for describing the look and formatting of a document

JavaScript is prototype-based with first-class functions, making it a multi-paradigm language, supporting object-oriented, imperative, and functional programming styles.

Along with HTML and JavaScript, CSS is a cornerstone technology used by most websites to create visually engaging webpages, user interfaces for web applications, and user interfaces for many mobile applications.

browsers can read HTML files and render them into visible or audible web pages.

Beyond HTML, CSS, DOM, JavaScript, HTTP/URL, and browser development know-how, a front-end developer could be skilled in one or more of the following:
Content Management Systems (aka CMS)
Node.js
Cross-Browser Testing
Cross-Platform Testing
Unit Testing

Offline development & Progressive Web Apps go mainstream

Front-End Developer

This role typically requires a computer science degree

Front-end devs are introduced to Hot Module replacement techniques and time travel debugging