Front-end Knowledge: Do you understand...?

CSS: Vendor prefixes

General: Feature Detection

JavaScript: Variable hoisting

CSS: Qualified Selectors

HTML: Semantics

CSS: BEM

JavaScript: Modules

CSS: Object Oriented CSS

General: MVC

General: MV* also known as MV Whatever

CSS: Selector performance

HTML: Tabindex

JavaScript: Closures

JavaScript: fn.call() and fn.apply()

CSS: Media Queries

HTML: Data Attributes

JavaScript: Event Delegation

JavaScript: Globals

JavaScript: Passing by value or reference

JavaScript: XMLHttpRequest / AJAX

JavaScript: DOMContentLoaded vs window.load

JavaScript: fn.bind() and the effect on this

General: Mobile first development

JavaScript: Caching object property access

JavaScript: Scope

CSS: Specificity

CSS: Sass

CSS: Location independence

HTML: HTML5 Sectioning Elements e.g. header, footer, aside

CSS: Sprites

JavaScript: The new keyword

JavaScript: Array Extras e.g. map, reduce, filter

JavaScript: ES2015

JavaScript: DOM manipulation / querying without jQuery

JavaScript: Promises

HTML: Why JavaScript should be included at the bottom of your HTML document

JavaScript: Prototypal Inheritance

HTML: ARIA Roles

JavaScript: Partial application / Currying

General: Progressive Enhancement vs Graceful Degradation

JavaScript: null vs undefined

JavaScript: Why typeof isn't safe

JavaScript: The delete keyword and its caveats

General: Responsive web design