HTML 5 Browser Feature Comparison Table
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See the blog post to this:
HTML 5 Browser Feature Comparison Table
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http://blog.liip.ch/html-5-feature-comparison-table.htmlIE6/7IE8FF 3FF 3.5Safari 4Safari MobileChromeOperaGearsFlash/JS FallbackUsable with latest? (IE8/FF3.5/Safari4)Useable with decent degration?Recommended in a "controlled" environment (IMHO)Some Links
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Offline NoEventsYes (4)YesYesYesYesEventsYesNoNoMaybe = without offlineYeshttps://developer.mozilla.org/en/Offline_resources_in_Firefoxhttp://gmail.com

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WorkerNoNoNoYesYesNoYesNoYesNot SureNoNoMaybehttps://developer.mozilla.org/En/Using_web_workershttp://n.a.edgar.googlepages.com/mandelbrot-gg.html
http://n.a.edgar.googlepages.com/mandelbrot-nogg.html
http://www.whatwg.org/specs/web-workers/current-work/
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Local/Session Storage NoyesNoYesYesYesNoNoNoMaybe FlashYesMaybe, with cookies and "traditional" sessions on the server sideYeshttps://developer.mozilla.org/en/DOM/Storagehttp://robertnyman.com/javascript/javascript-dom-storage.html#session-storage
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Local DatabaseNoNoNoNoYesYesYesNoYesMaybe FlashNoMaybe with "outsourcing" the local db to the server as fallbackYeshttp://labs.liip.ch/gearsdemo/index.html
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GeolocationNoNoNoYesNoYesYesNoYesNoNoNo, except manual...Yeshttps://developer.mozilla.org/En/Using_geolocation
http://localhost/samples/geo.html
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Video/AudioNoNoNoYes (1)Yes (2)Yes (2)YesYesNoYes, FlashNoYes, with standard Flash FallbackMaybe, but benefit is quite lowhttps://developer.mozilla.org/En/Using_audio_and_video_in_Firefoxhttp://people.xiph.org/~maikmerten/demos/arctic_giant.html
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Native JSONNoYesNoYesNoNoNoNoNoYes, JS onlyNoYes, JSON written in JSYeshttps://developer.mozilla.org/En/Using_native_JSONhttp://robertnyman.com/javascript/javascript-native-json.html
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Cross Site XHRNoYes (3)NoYesYesYesYesNoNoYes, FlashYesMaybe with FlashNo, look for alternatives like JSONP until IE7 is deadhttps://developer.mozilla.org/En/HTTP_access_controlhttp://arunranga.com/examples/access-control/
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Cross-document messagingNoYesYesYesYesYesYesNoNoYes, FlashYesMaybe with FlashMaybe, if you really need it anywayhttp://ejohn.org/apps/message/
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CanvasNoNoYesYesYesYesYesYesNoNoNoNot really, but there are implementations for converting canvas to VMLNohttp://ponderer.org/download/canvas_demo/
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DOM SelectorsNoYesNoYesYesYesYesNoNoYes, JSYesYes, in JSYes, should be built in in your JS Library anywayhttps://developer.mozilla.org/En/DOM/Locating_DOM_elements_using_selectorshttp://www.javascriptkit.com/dhtmltutors/css_selectors_api.shtml
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CSS Transform (Draft)NoNoNoYesYes YesYesNoNoNoNoNoNohttps://developer.mozilla.org/En/CSS/Using_CSS_transformshttp://www.the-art-of-web.com/css/css-animation/
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CSS Media QueriesNoNoNoYesYesYesYesYesNoNoNoMaybe, some featuresNohttps://developer.mozilla.org/En/CSS/Media_querieshttp://virtuelvis.com/gallery/mediaqueries/
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Drag&Drop from DesktopNoNoNoMaybe (5)Maybe (5)NoMaybe (5)NoYesMaybe FlashNoMaybe, with usual file selectorsYes, benefit is good
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Drag&Drop (HTML5)NoNoNoYesYesNoYesNoNoYes, JSNoYes, in JSYes, should be built in in your JS Library anywayhttps://developer.mozilla.org/En/DragDrop/Drag_and_Drophttp://www.whatwg.org/specs/web-apps/current-work/#dnd
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Blob Builder / File Upload with XHRNoNoNoYesNoNoNoNoYesYes, FlashNoYes, do standard/iframe upload insteadYes, benefit is goodhttp://hacks.mozilla.org/2009/06/xhr-progress-and-richer-file-uploading-feedback/http://dev.w3.org/2006/webapi/FileUpload/publish/FileUpload.html#File-if
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(1) Ogg Only
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(2) No Ogg
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(3) With XDomainRequest instead of XHR
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(4) less "good" than FF 3.5
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(5) Drag&Drop HTML5 should support it
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