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Comparison of HTML5 and Flash
Adobe owned Flash and W3C and WHATWG mixed release of HTML5 has several distinction.

Modern HTML5 has feature-parity with the now-obsolete Adobe Flash. Both include features for playing audio and video within web pages. Flash was specifically built to integrate vector graphics and light games in a web page, features that HTML5 also supports.

Adobe no longer supports Flash Player after December 31, 2020 and blocked Flash content from running in Flash Player beginning January 12, 2021.

The HTML5 specification does not itself define ways to do animation and interactivity within web pages. "HTML5" in this article sometimes refers not only to the HTML5 specification, but to HTML5 and related standards like SVG, JavaScript and CSS 3.

Animation via JavaScript is also possible with HTML 4.

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Comparison table

The table below compares the features of the Flash platform, the HTML5 specification and the features implemented in modern web browsers.

HTML5 standardHTML web browser featuresAdobe Flash/AIR features
Date startedWork began in 2003 Working Draft as of 20113—Work began in 1996 Version 1 released in 1997
Desktop operating systems—AmigaOS, MorphOS, Apple macOS, Linux, Microsoft WindowsApple macOS, Linux, Microsoft Windows
Mobile operating systems—* Android 2.3 and newer4
Video game consoles—
Device support—Full, permission-based access to web camera, microphone, accelerometer and GPS
Market penetration—82.3% of websites (as of March 28, 2020)244.5% of websites (as of April 19, 2018)25
Browser support—97.5% of browser installations (as of February 2020)2629% of browser installations (as of July 2019)27
Vector graphics formats—Scalable Vector Graphics (SVG) supported on ~97% of browsers28SWF with embedded graphics and AS3SVGRenderer
Bitmap effectsYes90+%29 support of Filters in CSS3 (e.g. Glow, Blur, Drop Shadow, Sepia)30Yes, applied to text or graphics (e.g. Glow, Drop Shadow, Bevel)31
Vector text displayYesYesYes, with Saffron Type System
Font support—Installed fonts and custom fonts using CSS 3 web fontsInstalled fonts and embedded fonts32
Text anti-aliasing—Yes, implemented in most browsers, for system and custom fontsYes, in most cases33
Text tab stopsNoOnly supported inside "pre" tagsYes, with Text Layout Framework
Liquid text layoutYesYes, via "div" tag and CSS stylingNo, but text fields can be resized in ActionScript
Tabular dataYesYes, via "table" tagNo, but text fields can be arranged into a grid
Linked text frames34As of 2016[update], two specifications compete: CSS Regions35 and CSS Overflow36With CSS Regions, supported by Safari, IE11 and Edge37Yes, with Text Layout Framework38
Programming languagesDependsJavaScriptActionScript, Pixel Bender
C++ supportCross-compiling C++ code to JavaScript via EmscriptenSupported with WebAssemblyCross-compiling C++ code to run in Flash Player via FlasCC39 AIR has AIR Native Extensions that allow loading native code, such as compiled C++ code.
Code delivery formatPlaintextPlaintext JavaScript with limited obfuscation, WebAssembly bytecode, GLSL for GPUs, in Canvas elementsCompiled bytecode, can be obfuscated
Data formatsDependsCSS 3, HTML, XML, JSON40JSON, XML, Subset of CSS 141
Data compressionNoGZIP compression for HTML, JS and CSS files42LZMA or DEFLATE for SWF files
Image formatsDependsPNG, JPEG, SVG, Animated GIF4344PNG, JPEG, JPEG-XR, Single-frame GIF4546
Video formatsDepends90+% support of H.264;47 varying support of WebM and Ogg Theora (see HTML video)H.264, Sorenson Spark, and On2 VP648
Streaming videoYes49Supported by IE, Edge, Firefox, Chrome, Safari and Opera.50Flash Video, H.264 and partial support for MP4
Audio formatsDepends~94% support of MP3,51 AAC52 and WAV PCM; varying support of Ogg Vorbis, and WebM Vorbis (see HTML audio)MP3, WAV and AAC audio files or embedded sound
Fullscreen supportYes53Supported on all major desktop browsers, with warning displayed.54 Not yet widely supported on mobileYes, with warning displayed
Encryption DRMDepends~65% support of audio/video files.55 All other files being plaintext, except for obfuscationNo, binary formatted files can be decompiled, which is obfuscation
File system accessDependsSingle file upload, and drag and drop of files onto browser56Support for single file upload and generation,57 AIR only: full create/read/write access to file system58
Bitmap manipulationDepends~95% support for canvas element59Yes, via BitmapData class60
Binary manipulationYesYes, via JavaScript Typed Arrays61Yes, via ByteArray class62
Large binary dataNoVia Web Sockets to stream binary or other dataYes, embedded or streaming binary data63
Offline storageDependsYes, via Web storage, HTTP cookie, or Indexed DB to store binary, XML or JSON data64Yes, via Local Shared Objects to store AMF-formatted data
MetadataMeta tagsCan be included in meta tagsExtensible Metadata Platform

Notes

Comparison

Software support

Flash

Originally, web browsers could not render Flash media themselves, and required the proprietary freeware plugin Adobe Flash Player. Until 2008, there was no official specification by which to create an alternative player. Alternative players were developed before 2008, but they supported Flash to a lesser degree than the official one.65 Flash support is built in to Google Chrome,6667 Internet Explorer 10 (and later),6869 and Microsoft Edge.70

The last version of the Adobe Flash Player ran on Microsoft Windows, Apple macOS, RIM, QNX and Google TV.

Earlier versions ran on Android 2.2-4.0.x (Flash was released for 4.0, but Adobe discontinued support for Android 4.1 and higher.71) (Flash 11.2), Linux (Flash 11.2, except for Pepper Flash which is maintained and distributed by Google, not Adobe), PlayStation 3 (Flash 9), PSP (Flash 6). Adobe Flash Lite runs on Wii, Symbian, Maemo Linux, Windows Mobile, and Chumby.

Apple never allowed Flash to run on iOS, the operating system which runs on iPad, iPhone, iPod Touch and Apple TV.72 Apple officially dropped support for Adobe Flash from the macOS version of Safari 14 released on September 17, 2020 for macOS 10.14 Mojave & macOS 10.15 Catalina.

In February 2012, Adobe announced it would discontinue development of Flash Player on Linux for all browsers, except Google Chrome, by dropping support for NPAPI and using only Chrome's PPAPI.7374 In August 2016, Adobe announced that, beginning with version 24, it would resume offering of Flash Player for Linux for other browsers.75 Adobe stopped traditional support for the Flash platform in 2020 and both Firefox and Google Chrome phased out support of Flash.76

HTML5

Almost all web browsers support HTML and other Web standards to various degree. Adobe released a tool that converts Flash to HTML5,77 and in June 2011, Google released an experimental tool that does the same.7879

As of December 2013[update], versions of browsers such as Chrome, Firefox, Internet Explorer, Opera, and Safari implement HTML5 to a considerable degree. However, some portions of the HTML5 specification were still being implemented by browser makers.

As of January 2015, YouTube defaults to HTML5 players to better support more devices. HTML5 needs less processing power making it run faster on all browsers. The multimedia integration with HTML5 is quite easy and creates better support for live video streaming on mobile devices also.80

Vendor neutrality

Until 2008, the use of Flash was covered by restrictive licenses. The conditions prohibited use of the specification to develop any software (including players) which could render or read (and thus convert) SWF files, and required the output SWF files to be compatible with Adobe's players.81

In 2008, restrictions on use of the SWF and FLV/F4V specifications were dropped, and some specifications were released.82 However, the "SWF File Format Specification Version 10" allegedly did not contain all the needed information, did not contain much information that hadn't been previously known by the community,83 and itself could not be copied, printed out in more than one copy, distributed, resold or translated, without written approval of Adobe Systems Incorporated.84

Flash was not an open standard. It was controlled by one firm, Adobe Systems. In contrast, HTML5 is controlled mostly by a committee, the Web Hypertext Application Technology Working Group (WHATWG).85

Various people have praised Flash over the years for rendering consistently across platforms. Constructing sites in Flash was a way to prevent code forking, whereby different versions of a site are created for different browsers.8687

Speaking at 'Adobe Max' in 2011, Itai Asseo likewise said that, unlike HTML5, Flash offers a way to develop applications that work across platforms. HTML5, he said, is currently implemented differently (if at all) by different browsers. Although the Flash browser plugin is not supported on the Apple iPhone OS, Flash applications can be exported to Adobe AIR, which runs on that operating system as a native application. In the same talk, Mr. Asseo lamented the return to another browser war (as seen in the late 1990s). If Flash falls out of favor, he said, web developers will either have to develop many different versions of their web sites and native applications to take into account different HTML5 implementations, deny access to browsers that do not support their version of HTML, or dramatically reduce the functionality of their sites in order to deliver content to the least-advanced browser.88

Authoring

Constructing Flash websites using Adobe tools is relatively easier than with integrated development environments for CSS, HTML, and JavaScript;89 however, many of Adobe's tools are expensive and proprietary software.90

In 2011 Adobe released a Flash-to-HTML5 conversion tool for existing content91

Because HTML5 is an open format, tools like those for Flash can be built for it, too. Applications like Hype92 and Adobe Edge are already on the market.

Performance

See also: Adobe Flash § Performance

Flash had a better performance than HTML according to a comparison of Flash with HTML in 2010 which listed Flash as being faster than the other technologies, when used for non-video animations, although they are catching up.9394

Some users, more so those on macOS and Linux, complained about the relatively high CPU usage of Flash for video playback.95[unreliable source?] This was partially because the Flash plugin did not use the GPU to render video. Adobe has responded to some of those criticisms in the 10.1 and 10.2 releases of the Flash plugin by offloading H.264 video decoding to dedicated hardware and by introducing a new video API called Stage Video.96[unreliable source?] The use of the newer ActionScript 3.0 inside Flash movies instead of the older ActionScript 2.0 improves code execution speed by a factor of around 10.97 The software routines written by developers can also affect the performance of applications built in Flash, reasons that would affect HTML5 animations as well.98

DRM

Flash included DRM support. The main HTML 5 standard does not include any digital rights management functionality directly, instead the Encrypted Media Extensions (EME) specification describes application interface (API) for communication channel between web browsers and digital rights management (DRM) agent software.

Historically, before EME introduction implementations could support DRM, for example in codecs.99 The proposal to add DRM features to HTML5 itself has been criticized by those who consider openness and vendor-neutrality (both server- and client-side) one of the most important properties of HTML, because DRM is incompatible with free software,100101 and in the proposed form potentially not more vendor-neutral than proprietary plug-ins like Flash.102103

Accessibility

Both Flash and HTML text can be read by screen readers. However, special care must be taken to ensure Flash movies are read correctly. For example, if a Flash movie is set to repeat indefinitely, this can cause a screen reader to repeat the content endlessly. Selecting the "Make object accessible" check box in Adobe Flash Professional would create a text-only version of the object for screen readers and hide any motion from the screen reader.104 Since Flash content was usually placed on a single webpage, it appeared as a single entry in search engine result pages, unless developers utilized deep linking to provide multiple links within Flash websites and web applications. User interface widgets in Flash objects would not always behave like their host native counterparts. Keyboard, mouse and other accessibility shortcuts may not have worked unless the webpage developer explicitly added support for it.

Search engines

Both Flash content and HTML content could be indexed by Google, Yahoo!, and Bing, although bi-directional text (e.g. Arabic, Hebrew) is not supported by Google.105106 Yahoo! added support for indexing Flash sites in 2008, although Google had been able to index them for several years before that. Bing added support for Flash sites in 2010.

iOS devices

Main article: Thoughts on Flash

Apple promoted HTML5 as an alternative to Flash for video and other content on the iOS, citing performance and security reasons for not allowing Adobe Flash Player to be installed on iOS devices, including the iPhone, iPod Touch and iPad.107 Flash applications could be packaged as native iOS applications via the Adobe Integrated Runtime and the iOS Packager.108

See also

  • Internet portal

Notes

References

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