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The AppCache, Indexed Database API, and Web storage makes it possible for mobile developers to store things locally on the device, so interruptions in connectivity will not affect the ability for someone to get their work done.
Offline support helps browsers cache static pages. They depend more on HTTP response headers sent by web servers to fetch HTML, CSS and multimedia required to render the web page. If everything required to render is cached, then a page loads quickly, but even if one item is not cached then everything slows down dramatically.
To provide offline support, a cache manifest file should be created to specify the offline application's resources--i.e. its pages, images, and other files needed to run offline. Typically, the manifest also contains a comment that is changed when any of the resources change, prompting the browser to refresh the cache.
CACHE MANIFEST # Version 0.1 online.html /iui/iui.js /iui/iui.css /iui/loading.gif /iui/toolbar.png /iui/whiteButton.png /images/gymnastics.jpg /images/soccer.png /images/gym.jpg /images/soccer.jpg
The "manifest" attribute of the app's "html" element should specify the URL of the manifest file.
Sites can mark off a space on a page using a Canvas element where interactive pictures, charts and graphs, game components, and other imaginations can be drawn directly by programming code and user interaction -- no Flash or other plug-ins are required.
Development is in the very early stages and subject to format disruption, but sites like YouTube and Pandora could one day skip Flash entirely and bring streaming audio and video, with timed playback and further features.
navigator.geolocation.getCurrentPosition(successCallback, errorCallback, options);
Geolocation is an object which is part of Navigator object. It uses the getCurrentPosition method. Finding location is an asynchronous operation as it requires the user's permission for access. Hence callback functions for success and failure are required.
A Mobile Web Metrics Report demonstrates HTML5 capabilities in mobile devices. The report checked how many HTML5 features are supported by different devices that access the mobile web.
GeolocationAPI, offline web application support, WebStorage, CSS3 Selectors and 2D animations are the top five supported features referred to by the term HTML5 across the top 15 mobile devices in all USA, UK, Germany, Malaysia, Australia markets examined.
Misc. Element types and attributes, extended user interaction concept, CSS3 in General, extended form concept, and extended video / audio support are the top five partially supported HTML5 features across the top 15 mobile devices in all USA, UK, Germany, Malaysia, Australia markets examined.
Microdata, 3D animation rendering, FileReader API, IndexedDB, and local Device support or the WebWorkers feature respectively are the top five HTML5 features not supported across the top 15 mobile devices in all USA, UK, Germany, Malaysia, Australia markets examined.
This report concludes that HTML5 is a welcome addition to the mobile party, but it does not negate device and OS fragmentation.
Hybrid mobile apps have their pros and cons. When choosing what type of mobile application to develop it is important to keep these in mind.
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