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Performance API

The High Resolution Time standard defines a Performance interface that supports client-side latency measurements within applications. The Performance interfaces are considered high resolution because they are accurate to a thousandth of a millisecond (subject to hardware or software constraints). The interfaces support a number of use cases including calculating frame-rates (potentially important in animations) and benchmarking (such as the time to load a resource).
Guide NeedsContent Overview performance Performance Web Performance

Touch events

In order to provide quality support for touch-based user interfaces, touch events offer the ability to interpret finger (or stylus) activity on touch screens or trackpads.
Advanced DOM Event Guide Mobile Overview

CSS Background and Borders

CSS Background and Borders is a module of CSS that defines how background and borders of elements are described. Borders can be lines or images, boxes can have one or multiple backgrounds, have rounded corners, and shadows.
CSS CSS Backgrounds and Borders CSS Reference Overview

CSS Lists and Counters

CSS Lists and Counters is a module of CSS that defines how lists are laid out, how the list marker can be styled and how authors can create new counters.
CSS CSS Lists and Counters CSS Reference Overview

CSS Masks

CSS Masks is a CSS module that defines means, including masking and clipping, for partially or fully hiding portions of visual elements.
CSS CSS Masks CSS Reference NeedsBrowserCompatibility NeedsMobileBrowserCompatibility Overview

Credential Management API

This API lets websites interact with a user agent’s password system so that websites can deal in a uniform way with site credentials and user agents can provide better assistance with the management of their credentials. For example, user agents have a particularly hard time dealing with federated identity providers or esoteric sign-in mechanisms that use more than just a username and password. To address these problems, the Credential Management API provides ways for a website to store and retrieve different types of password credentials. This give users capabilities such as seeing the federated account they used to sign on to a site, or resuming a session without the explicit sign-in flow of an expired session.
API credential management credentials Landing NeedsContent Overview Reference

HTML Drag and Drop API

HTML Drag and Drop interfaces enable applications to use drag and drop features in Firefox and other browsers. For example, with these features, the user can select draggable elements with a mouse, drag the elements to a droppable element, and drop those elements by releasing the mouse button. A translucent representation of the draggable elements follows the mouse pointer during the drag operation.
Advanced drag and drop events Events Guide HTML5 Overview XUL

Idle API

The Idle API is used to notify an app when the user is idle. This lets an app take action when the user is doing nothing with his device. The most common use case is to save battery power; in this case, it is commonly used in conjuction with the Power Management API.
API Firefox OS Idle Non-standard Overview Reference

Intersection Observer API

The Intersection Observer API allows you to configure a callback that is called whenever one item, called a target, intersects either the device viewport or a specified element called, for the purpose of this API, the root element. Create the intersection observer by calling its constructor and passing it a reference to the callback function.
API Intersection Observer API IntersectionObserver Landing Overview Reference

Service Worker API

A service worker is an event-driven worker registered against an origin and a path. It takes the form of a JavaScript file that can control the web page/site it is associated with, intercepting and modifying navigation and resource requests, and caching resources in a very granular fashion to give you complete control over how your app behaves in certain situations (the most obvious one being when the network is not available.)
API Landing offline Offline Overview Reference Service Workers Workers

Web Audio API

The Web Audio API involves handling audio operations inside an audio context, and has been designed to allow modular routing. Basic audio operations are performed with audio nodes, which are linked together to form an audio routing graph. Several sources — with different types of channel layout — are supported even within a single context. This modular design provides the flexibility to create complex audio functions with dynamic effects.
API Guide Overview Reference Référence Web Audio API

Using HTML sections and outlines

The HTML5 specification brings several new elements to web developers allowing them to describe the structure of a web document with standard semantics. This document describes these elements and how to use them to define the desired outline for any document.
Advanced Example Guide HTML HTML5 Outlines Overview Sections sections Web

Battery Status API

The Battery Status API, more often referred to as the Battery API, provides information about the system's battery charge level and lets you be notified by events that are sent when the battery level or charging status change. This can be used to adjust your app's resource usage to reduce battery drain when the battery is low, or to save changes before the battery runs out in order to prevent data loss.
API Apps Battery Battery API Battery Status API Firefox OS Guide Mobile Overview

Data Store API

The Data Store API was created to allow multiple Firefox OS apps, with potentially different data structures and storage mechanisms, to create, maintain and share the same data objects efficiently between one another. Each app can then import the data into its own local IndexedDB to index according to their specific query needs. This is not necessary however, and you can just write directly to the Data Store API data store.
API Certified data Data Store Data Store API Firefox OS Interface Overview Reference Référence WebAPI