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<!doctype html>
<html class="no-js" lang="en">
<head>
<meta charset="utf-8">
<meta content="IE=edge,chrome=1" http-equiv="X-UA-Compatible">
<title>HTML5 Please - Use the new and shiny responsibly</title>
<meta name="description" content="Look up HTML5, CSS3, etc features, know if they are ready for use, and if so find out how you should use them – with polyfills, fallbacks or as they are.">
<meta content="width=device-width, initial-scale=1.0" name="viewport">
<link rel="shortcut icon" href="favicon.ico" />
<link rel="apple-touch-icon-precomposed" sizes="114x114" href="apple-touch-icon-114x114-precomposed.png">
<link rel="apple-touch-icon-precomposed" sizes="72x72" href="apple-touch-icon-72x72-precomposed.png">
<link rel="apple-touch-icon-precomposed" href="apple-touch-icon-precomposed.png">
<link href="http://fonts.googleapis.com/css?family=Francois+One|Open+Sans:400italic,400,800" rel="stylesheet">
<link href="css/style.css" rel="stylesheet">
<script src="js/libs/modernizr-2.0.min.js"></script>
<script>if (location.host == 'h5bp.github.com') location.href = '//html5please.us/'</script>
</head>
<body id="gfs">
<header class="index">
<h1>HTML5 <img src="img/HTML5-logo.png" alt="HTML5 Logo"> Please</h1>
<h2>
<b>Use the new and shiny responsibly.</b>
<p>Look up HTML5, CSS3, etc features, know if they are ready for use, and if so find out how you should use them – with polyfills, fallbacks or as they are. <a href="#moredetails" id="clickmore">tell me more</a>
</p>
<div id="moredetails">
<p><a href="http://caniuse.com">When Can I Use</a> tells you the browser support story, while <a href="http://modernizr.com">Modernizr</a> gives you the power of feature detection. HTML5 Please helps you out with recommendations for <a href="https://github.com/Modernizr/Modernizr/wiki/HTML5-Cross-browser-Polyfills">polyfills</a> and implementation so you can decide if and how to put each of these features to use.</p>
<p>The recommendations below represent the collective knowledge of developers who have been deep in the HTML5 trenches. We hope they serve you well.</p>
<p>Read Divya's backstory <a href="http://nimbupani.com/html5please.html">about this site</a>.</p>
</div>
</h2>
<div>
<input id="livesearch" class="search" name="livesearch" placeholder="type to filter" type="search" value="" autofocus />
<a href="/" id="searchurl">link to this search ›</a>
<div class="explore-features">
<h2><b>Explore</b> features</h2>
<ul>
<li>supported by <a href="#gtie9">IE10+</a> <a href="#gtie8">IE9+</a> <a href="#gtie7">IE8+</a> <a href="#gtie6">IE7+</a> <a href="#noie">no IE</a> </li>
<li>not supported by <a href="#nomobile">mobile devices</a> <a href="#nooldmobile">older mobile devices</a></li>
<li>requiring <a href="#prefixes">prefixes</a><a href="#polyfill">polyfill</a><a href="#fallback">fallback</a></li>
<li>that you should <a href="#use">use</a> <a href="#caution">use with caution</a> <a href="#avoid">avoid</a></li>
<li>that are <a href="#css">css</a> <a href="#html">html</a><a href="#api">api</a><a href="#js">js</a></li>
<li> <a href="#showall">all features</a></li>
</ul>
</div>
</div>
</header>
<div id="main" role="main">
<section class="features list">
<article class="fallback">
<header>
<h2 class="name" id="animations">animations </h2>
<h3 class="status caution">caution <i>with <b class=fallback>fallback</b></i> </h3>
<h4 class="kind css">css</h4>
</header>
<div class="more">
<div class="recco">
<p>CSS Animations are still in flux. The Working Group has <a href="http://www.w3.org/2012/01/13-svg-minutes.html#action02">decided to provide</a> a universal animation spec that would work across CSS, SVG and HTML. For now, either use animations only to provide non-essential aesthetic enhancements or use feature detection to provide an alternative experience for browsers that do not support this feature.</p>
</div>
<div class="polyfills"></div>
<p class="links">
<a href="http://caniuse.com/animations">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/animations.md">Edit this info</a>
</p>
</div>
<footer class="tags">fallback</footer>
</article>
<article class="polyfill">
<header>
<h2 class="name" id="<audio>"><audio> </h2>
<h3 class="status use">use <i>with <b class=polyfill>polyfill</b></i> </h3>
<h4 class="kind html">html</h4>
</header>
<div class="more">
<div class="recco">
<p>As is the case with video, you need to provide your audio file in multiple formats for these to work, namely in <a href="http://www.scirra.com/blog/44/on-html5-audio-formats-aac-and-ogg">Ogg Vorbis and AAC</a>. jPlayer has a jQuery dependency. Sound Manager has an extensive API for further customization. <a href="http://mediaelementjs.com/">mediaelement.js</a> offers the HTML5 media element API through Flash in the fallback case and offers uniform styling across browsers and to the Flash widget.</p>
</div>
<div class="polyfills"><b>Recommended polyfills: </b><p><a href="http://mediaelementjs.com/">mediaelement.js</a>, <a href="https://github.com/happyworm/jPlayer">jPlayer</a>, <a href="http://www.schillmania.com/projects/soundmanager2/">Sound Manager 2</a></p></div>
<p class="links">
<a href="http://caniuse.com/audio">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/audio.md">Edit this info</a>
</p>
</div>
<footer class="tags">polyfill</footer>
</article>
<article class="gtie8 fallback">
<header>
<h2 class="name" id="background-image options">background-image options </h2>
<h3 class="status use">use <i>with <b class=fallback>fallback</b></i> </h3>
<h4 class="kind css">css</h4>
</header>
<div class="more">
<div class="recco">
<p>CSS3 <code>background-image</code> options include <code>background-clip</code>, <code>background-origin</code> and <code>background-size</code>. Just ensure that your background image does not make it unreadable on IE8- where these properties are not supported. Also, when using <code>background-image</code> make sure you have a fallback color in case the image fails to load. </p>
</div>
<div class="polyfills"></div>
<p class="links">
<a href="http://caniuse.com/background-image">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/background-image.md">Edit this info</a>
</p>
</div>
<footer class="tags">gtie8 fallback</footer>
</article>
<article class="fallback prefixes">
<header>
<h2 class="name" id="border-image">border-image </h2>
<h3 class="status use">use <i>with <b class=fallback>fallback</b></i> </h3>
<h4 class="kind css">css</h4>
</header>
<div class="more">
<div class="recco">
<p>Make sure to use all the right prefixes (<code>-o-</code>, <code>-webkit-</code>, <code>-ms-</code>, <code>-moz-</code>). Additionally, <a href="http://border-image.com/">border-image.com</a> may help. You should let this fall back to either a normal solid border or no border at all, depending on whether a border is essential for readability. We recommend that you avoid polyfills.</p>
<p>There were some syntax changes (requiring the <code>fill</code> keywords) that may catch you off-guard; <a href="http://dbaron.org/log/20120612-border-image">David Baron's border-image post</a> describes the best course of action.</p>
</div>
<div class="polyfills"></div>
<p class="links">
<a href="http://caniuse.com/border-image">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/border-image.md">Edit this info</a>
</p>
</div>
<footer class="tags">fallback prefixes</footer>
</article>
<article class="">
<header>
<h2 class="name" id="border-radius">border-radius </h2>
<h3 class="status use">use <i></i> </h3>
<h4 class="kind css">css</h4>
</header>
<div class="more">
<div class="recco">
<p><code>border-radius</code> can be safely used without a prefix for all modern browsers, and gracefully renders rectangles when not supported. However, note that applying this to a large area and on many elements <a href="http://perfectionkills.com/profiling-css-for-fun-and-profit-optimization-notes/">might cause significant performance</a> impact when scrolling or when the window is redrawn. </p>
</div>
<div class="polyfills"></div>
<p class="links">
<a href="http://caniuse.com/border-radius">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/border-radius.md">Edit this info</a>
</p>
</div>
<footer class="tags"></footer>
</article>
<article class="none">
<header>
<h2 class="name" id="box-reflection">box-reflection </h2>
<h3 class="status avoid">avoid <i></i> </h3>
<h4 class="kind css">css</h4>
</header>
<div class="more">
<div class="recco">
<p>The <code>box-reflect</code> property has never been part of any CSS specification. Certain presentations that are possible with <code>-webkit-box-reflect</code> will be possible using CSS Filters. You should avoid using WebKit-only box reflections.</p>
</div>
<div class="polyfills"></div>
<p class="links">
<a href="http://www.webkit.org/blog/182/css-reflections/">
Learn more
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/box-reflection.md">Edit this info</a>
</p>
</div>
<footer class="tags">none</footer>
</article>
<article class="prefixes">
<header>
<h2 class="name" id="box-shadow">box-shadow </h2>
<h3 class="status caution">caution <i></i> </h3>
<h4 class="kind css">css</h4>
</header>
<div class="more">
<div class="recco">
<p><code>box-shadow</code> is safe to use most of the time, except when you are applying it on a large area as that may cause significant performance impact when interacting with the page (on scroll and hovers, but also transitions and animations). </p>
<p>Polyfills are unnecessary for box-shadow. They are too costly and slow down page load. Users without a modern browser will not see a shadow, but aren't checking your site in multiple browsers anyhow.</p>
<p>Box shadows can also be applied safely without prefixes. </p>
</div>
<div class="polyfills"></div>
<p class="links">
<a href="http://caniuse.com/box-shadow">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/box-shadow.md">Edit this info</a>
</p>
</div>
<footer class="tags">prefixes</footer>
</article>
<article class="fallback prefixes gtie7 border-box">
<header>
<h2 class="name" id="box-sizing">box-sizing </h2>
<h3 class="status use">use <i>with <b class=fallback>fallback</b></i> </h3>
<h4 class="kind css">css</h4>
</header>
<div class="more">
<div class="recco">
<p>Supported in Chrome, IE8+, Opera, Safari 5.1+. The <a href="http://paulirish.com/2012/box-sizing-border-box-ftw/">recommended pattern</a> is <code>box-sizing : border-box;</code>, preceded by the fallbacks <code>-webkit-box-sizing: border-box;</code> for old IOS<=4 and Android<=2.3, and <code>-moz-box-sizing: border-box;</code> for firefox. You can apply it to all (<code>*</code>) elements if you like.</p>
<p>For IE6/7 you can optionally use the <a href="https://github.com/Schepp/box-sizing-polyfill">box-sizing polyfill</a> to provide this feature in IE 6/7 (you could scope the adjustments using <a href="http://paulirish.com/2008/conditional-stylesheets-vs-css-hacks-answer-neither/">IE conditionals</a> or Modernizr's <a href="http://www.modernizr.com/download/#-cssclasses-addtest-css_boxsizing"><code>no-box-sizing</code></a>).</p>
<p>Besides the prefix, there are box sizing issues in Gecko/Firefox, see <a href="https://developer.mozilla.org/En/CSS/Box-sizing#Notes">notes at MDN</a>. Most notable, min-height/max-height does not work.</p>
</div>
<div class="polyfills"></div>
<p class="links">
<a href="http://caniuse.com/box-sizing">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/box-sizing.md">Edit this info</a>
</p>
</div>
<footer class="tags">fallback prefixes gtie7 border-box</footer>
</article>
<article class="none">
<header>
<h2 class="name" id="calc()">calc() </h2>
<h3 class="status caution">caution <i></i> </h3>
<h4 class="kind css">css</h4>
</header>
<div class="more">
<div class="recco">
<p>Internet Explorer, Chrome and Firefox are the only supporting browsers, which makes using calc() in production tedious given the impact it can have on layout and the consequent breaking of your design on unsupported browsers. We encourage you to use it for experimentation and always use a fallback declaration, so it doesn't break browsers which don't support it.</p>
<p>For now, <code>calc()</code> must always be used after a fallback declaration, so it doesn't break browsers which don't support it.</p>
<pre><code>width: 500px; /** older browsers **/
width: -webkit-calc(50% - 20px); /** Chrome / Safari **/
width: -moz-calc(50% - 20px); /** Mozilla Firefox **/
width: -o-calc(50% - 20px); /** could be calc(), no idea about Opera's plans **/
width: calc(50% - 20px); /** IE and future other browsers **/
</code></pre>
</div>
<div class="polyfills"></div>
<p class="links">
<a href="http://caniuse.com/calc">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/calc.md">Edit this info</a>
</p>
</div>
<footer class="tags">none</footer>
</article>
<article class="gtie8 polyfill">
<header>
<h2 class="name" id="<canvas>"><canvas> </h2>
<h3 class="status use">use <i>with <b class=polyfill>polyfill</b></i> </h3>
<h4 class="kind html">html</h4>
</header>
<div class="more">
<div class="recco">
<p><code>canvas</code> is definitely good to go for modern browsers. If you want to support Internet Explorer 8 and below, ExplorerCanvas and FlashCanvas can be helpful in providing support for most <code>canvas</code> features. However, due to the complex nature of native <code>canvas</code> implementations, developers should be aware that the polyfills for <code>canvas</code> are not simple drop-in solutions in some cases.</p>
<p>For example, both <a href="https://groups.google.com/forum/?fromgroups#!searchin/google-excanvas/drawImage">ExplorerCanvas</a> and <a href="https://groups.google.com/forum/?fromgroups#!searchin/flashcanvas/drawImage">FlashCanvas</a> may have difficulties handling the commonly used <code>drawImage</code> method. FlashCanvas cannot be passed the bitmap data from a DOM-based <code>Image</code> object, and therefore has to re-request the asset in the Flash Player causing undesired latency and flickering. Developers should be careful when handling image data and ensure thorough testing due to the unreliability and technical limitations of these features in the polyfills.</p>
<p>That isn't to say <code>canvas</code> shouldn't be used if cross-browser compatibility is a concern. Existing polyfills are more than capable of rendering simpler bitmaps such as <a href="http://www.jqplot.com/deploy/dist/examples/kcp_pyramid2.html">charts/graphs</a>, <a href="http://thejit.org/static/v20/Jit/Examples/Sunburst/example2.html">visualizations</a>, and even <a href="http://flashcanvas.net/examples/www.chiptune.com/starfield/starfield.html">starfields</a>! For these uses and many more, <code>canvas</code> is highly encouraged.</p>
</div>
<div class="polyfills"><b>Recommended polyfills: </b><p><a href="http://flashcanvas.net/">FlashCanvas</a>, <a href="http://code.google.com/p/explorercanvas/">ExplorerCanvas</a></p></div>
<p class="links">
<a href="http://caniuse.com/canvas">
View browser share %
</a>
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</p>
</div>
<footer class="tags">gtie8 polyfill</footer>
</article>
<article class="polyfill noie nooldmobile">
<header>
<h2 class="name" id="classList">classList </h2>
<h3 class="status caution">caution <i>with <b class=polyfill>polyfill</b></i> </h3>
<h4 class="kind api">api</h4>
</header>
<div class="more">
<div class="recco">
<p>classList is a relatively new feature which may not be available in older browsers and Internet Explorer. While this is not a concern if you are using a library like jQuery to modify class names, make sure you use the polyfill when using classList directly.</p>
</div>
<div class="polyfills"><b>Recommended polyfills: </b><p><a href="https://github.com/eligrey/classList.js">classlist.js</a></p></div>
<p class="links">
<a href="http://caniuse.com/classlist">
View browser share %
</a>
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</p>
</div>
<footer class="tags">polyfill noie nooldmobile</footer>
</article>
<article class="polyfill">
<header>
<h2 class="name" id="CORS">CORS </h2>
<h3 class="status use">use <i>with <b class=polyfill>polyfill</b></i> </h3>
<h4 class="kind html">html</h4>
</header>
<div class="more">
<div class="recco">
<p>CORS, or cross-origin resource sharing, enables a few things, but most notably cross-domain AJAX. All non-IE browsers have support for CORS. IE8 introduced <a href="http://msdn.microsoft.com/en-us/library/ie/cc288060(v=vs.85).aspx">XDomainRequest</a>, so really only IE7 needs help with cross-domain files. Consider the polyfills below or you can fall back to using a <a href="http://benalman.com/projects/php-simple-proxy/">simple proxy</a>.</p>
</div>
<div class="polyfills"><b>Recommended polyfills: </b><p><a href="https://github.com/toolness/postmessage-proxied-xhr/#readme">postmessage-proxied-xhr</a>, <a href="http://flxhr.flensed.com/">flXHR</a> (requires crossdomain.xml), <a href="https://github.com/eligrey/pmxdr">pmxdr</a> (requires host installed)</p></div>
<p class="links">
<a href="http://caniuse.com/cors">
View browser share %
</a>
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</p>
</div>
<footer class="tags">polyfill</footer>
</article>
<article class="fallback gtie8">
<header>
<h2 class="name" id="css3 colors">css3 colors </h2>
<h3 class="status use">use <i>with <b class=fallback>fallback</b></i> </h3>
<h4 class="kind css">css</h4>
</header>
<div class="more">
<div class="recco">
<p>If you found yourself wanting to use <code>papayawhip</code> or <code>goldenrod</code> or <code>indianred</code> as your colors of choice, do feel free. You have to specify a fallback color for IE 8- users. Use the HSL(), HSLA() and RGBA() functions with more caution, as they may not be supported on older browsers.</p>
</div>
<div class="polyfills"></div>
<p class="links">
<a href="http://caniuse.com/css3-colors">
View browser share %
</a>
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</p>
</div>
<footer class="tags">fallback gtie8</footer>
</article>
<article class="polyfill gtie9 nomobile">
<header>
<h2 class="name" id="<datalist>"><datalist> </h2>
<h3 class="status use">use <i>with <b class=polyfill>polyfill</b></i> </h3>
<h4 class="kind html">html</h4>
</header>
<div class="more">
<div class="recco">
<p><a href="http://developers.whatwg.org/the-button-element.html#the-datalist-element"><code><datalist></code></a> enables autocomplete combo boxes. It can be polyfilled well with any of the scripts below, though they have <a href="https://github.com/h5bp/html5please/issues/18">varying levels</a> of support for the full feature. You can also use a <a href="http://adactio.com/journal/4272/">graceful fallback</a> if you choose not to polyfill.</p>
</div>
<div class="polyfills"><b>Recommended polyfills: </b><p><a href="http://css-tricks.com/relevant-dropdowns-polyfill-for-datalist/">Relevant Dropdowns</a>, <a href="http://afarkas.github.com/webshim/demos/">Webshims</a>, <a href="http://miketaylr.com/code/datalist.html">jQuery Datalist Plugin</a></p></div>
<p class="links">
<a href="http://caniuse.com/datalist">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/datalist.md">Edit this info</a>
</p>
</div>
<footer class="tags">polyfill gtie9 nomobile</footer>
</article>
<article class="fallback noie nooldmobile">
<header>
<h2 class="name" id="dataset">dataset </h2>
<h3 class="status use">use <i>with <b class=fallback>fallback</b></i> </h3>
<h4 class="kind api">api</h4>
</header>
<div class="more">
<div class="recco">
<p><code>elem.dataset</code> is unsupported in Internet Explorer and older mobile browsers. Using data-* attributes will be totally fine in all browsers, but instead of using <code>elem.dataset.foo</code> just use <code>elem.getAttribute('data-foo')</code>. A polyfill is availble if you want terser syntax.</p>
</div>
<div class="polyfills"><b>Recommended polyfills: </b><p><a href="http://eligrey.com/blog/post/html-5-dataset-support">HTML5 dataset support</a></p></div>
<p class="links">
<a href="http://caniuse.com/dataset">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/dataset.md">Edit this info</a>
</p>
</div>
<footer class="tags">fallback noie nooldmobile</footer>
</article>
<article class="polyfill">
<header>
<h2 class="name" id="<details>"><details> </h2>
<h3 class="status use">use <i>with <b class=polyfill>polyfill</b></i> </h3>
<h4 class="kind html">html</h4>
</header>
<div class="more">
<div class="recco">
<p>Use the details element if you intend to show a summary which, when clicked, reveals detailed information. Without any fallback, non-supporting browsers will fall back to displaying the element in the opened state.</p>
</div>
<div class="polyfills"><b>Recommended polyfills: </b><p><a href="http://mathiasbynens.be/notes/html5-details-jquery">Details</a>, <a href="http://akral.bitbucket.org/details-tag">jquery-details</a></p></div>
<p class="links">
<a href="http://caniuse.com/details">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/details.md">Edit this info</a>
</p>
</div>
<footer class="tags">polyfill</footer>
</article>
<article class="polyfill">
<header>
<h2 class="name" id="DOM">DOM </h2>
<h3 class="status caution">caution <i>with <b class=polyfill>polyfill</b></i> </h3>
<h4 class="kind api">api</h4>
</header>
<div class="more">
<div class="recco">
<p>A large subset of <a href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html">the DOM</a> can currently be correctly shimmed. However the current shims are not fully tested and are missing some features.</p>
<p>Experimentally use with caution until the shim implementations have matured.</p>
</div>
<div class="polyfills"><b>Recommended polyfills: </b><p><a href="https://github.com/termi/ES5-DOM-SHIM">ES5-DOM-shim</a>, <a href="https://github.com/Raynos/DOM-shim">DOM-shim</a></p></div>
<p class="links">
<a href="http://caniuse.com/dom">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/dom.md">Edit this info</a>
</p>
</div>
<footer class="tags">polyfill</footer>
</article>
<article class="polyfill nomobile">
<header>
<h2 class="name" id="drag n drop">drag n drop </h2>
<h3 class="status caution">caution <i>with <b class=polyfill>polyfill</b></i> </h3>
<h4 class="kind api">api</h4>
</header>
<div class="more">
<div class="recco">
<p>Drag and Drop has been standardized in HTML5 based on Internet Explorer's original implementation. Therefore, it already has wide support, but many feel frustrated when using the API. You may want to use jQuery UI Draggable (or another JavaScript library) to handle this for you. Meanwhile the proposed <a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/dnd.html#the-dropzone-attribute">[dropzone]</a> attribute will improve the situation as it gains browser support.</p>
</div>
<div class="polyfills"><b>Recommended polyfills: </b><p><a href="https://github.com/MrSwitch/dropfile">dropfile</a>, <a href="https://github.com/eligrey/FileSaver.js">fileSaver</a>, <a href="https://github.com/vjeux/jDataView">jDataView</a></p></div>
<p class="links">
<a href="http://caniuse.com/dragndrop">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/dragndrop.md">Edit this info</a>
</p>
</div>
<footer class="tags">polyfill nomobile</footer>
</article>
<article class="fallback gtie8 nooldmobile es5">
<header>
<h2 class="name" id="ECMAScript 5">ECMAScript 5 </h2>
<h3 class="status use">use <i>with <b class=fallback>fallback</b></i> </h3>
<h4 class="kind js">js</h4>
</header>
<div class="more">
<div class="recco">
<p>ECMAScript version 5 covers a large number of feature additions to what we normally call JavaScript.
Excluding IE8, <a href="http://kangax.github.com/es5-compat-table/">most of ES5 is supported in browsers</a>.
As it introduces no new syntax, it's possible to polyfill fairly well.
The below polyfills tackle most uses of these features, but <a href="https://gist.github.com/1664895">there is an unshimmable subset of ES5</a>.
Also note that some shims are known to have <a href="https://gist.github.com/1120592">edgecase compliance bugs</a>.</p>
</div>
<div class="polyfills"><b>Recommended polyfills: </b><p><a href="https://github.com/kriskowal/es5-shim/">es5-shim</a>, <a href="http://augmentjs.com/">augment.js</a></p></div>
<p class="links">
<a href="http://caniuse.com/ec">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/ec.md">Edit this info</a>
</p>
</div>
<footer class="tags">fallback gtie8 nooldmobile es5</footer>
</article>
<article class="es6">
<header>
<h2 class="name" id="ECMAScript 6">ECMAScript 6 </h2>
<h3 class="status avoid">avoid <i></i> </h3>
<h4 class="kind js">js</h4>
</header>
<div class="more">
<div class="recco">
<p>ECMAScript version 6 is the upcoming version of JavaScript that brings new features and heavy syntax changes. Currently only Chrome(17+) and Firefox support a highly experimental subset of ES6 features. </p>
<p>There is a <a href="https://github.com/paulmillr/es6-shim">ES6-shim</a> that attempts to shim a subset of ES6 however this subset is quite small, see the <a href="https://gist.github.com/1665192">ES6 shim status</a> for more details</p>
<p>Since ES6 brings new syntax to the language the best way to handle cross browser compliance is using a ES6 to ES3 compiler. However although there are a few projects in progress, none are ready to use.</p>
</div>
<div class="polyfills"></div>
<p class="links">
<a href="http://caniuse.com/es6">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/es6.md">Edit this info</a>
</p>
</div>
<footer class="tags">es6</footer>
</article>
<article class="fallback">
<header>
<h2 class="name" id="EventSource">EventSource </h2>
<h3 class="status use">use <i>with <b class=fallback>fallback</b></i> </h3>
<h4 class="kind api">api</h4>
</header>
<div class="more">
<div class="recco">
<p><a href="http://html5doctor.com/server-sent-events/">Server-Sent Events</a> are real-time events emitted by the server and received by the browser. EventSource.js provides a base fallback and is not dependent on jQuery.</p>
</div>
<div class="polyfills"><b>Recommended polyfills: </b><p><a href="https://github.com/remy/polyfills/blob/master/EventSource.js">EventSource.js</a>, <a href="https://github.com/rwldrn/jquery.eventsource">jQuery.eventsource</a></p></div>
<p class="links">
<a href="http://caniuse.com/Eventsource">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/Eventsource.md">Edit this info</a>
</p>
</div>
<footer class="tags">fallback</footer>
</article>
<article class="none">
<header>
<h2 class="name" id="exclusions">exclusions </h2>
<h3 class="status avoid">avoid <i></i> </h3>
<h4 class="kind css">css</h4>
</header>
<div class="more">
<div class="recco">
<p>Exclusions are new and exciting, but very much in flux. Active development to get an implementation out is on-going, but again, please avoid using this until there are stable implementations in the wild.</p>
</div>
<div class="polyfills"></div>
<p class="links">
<a href="http://css3clickchart.com/#exclusions">
Learn more
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/exclusions.md">Edit this info</a>
</p>
</div>
<footer class="tags">none</footer>
</article>
<article class="prefixes polyfill">
<header>
<h2 class="name" id="File API">File API </h2>
<h3 class="status use">use <i>with <b class=polyfill>polyfill</b></i> </h3>
<h4 class="kind api">api</h4>
</header>
<div class="more">
<div class="recco">
<p>Using the File API added to the DOM in HTML5, it's now possible for web content to ask the user to select local files.</p>
<p>FileReader pairs very well with Drag n Drop to allow for drag 'n drop file uploads, and if neither of those features are present, the fallback of providing an <code><input type=file></code> is rather easy.
Supported in Chrome, Firefox, Opera. Safari is currently missing FileReader support.</p>
<p><a href="https://github.com/Jahdrien/FileReader">FileReader</a> provides useful fallback, based on Flash, jQuery and jQuery UI.</p>
</div>
<div class="polyfills"><b>Recommended polyfills: </b><p><a href="https://github.com/Jahdrien/FileReader">FileReader</a></p></div>
<p class="links">
<a href="http://caniuse.com/fileapi">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/fileapi.md">Edit this info</a>
</p>
</div>
<footer class="tags">prefixes polyfill</footer>
</article>
<article class="prefixes polyfill">
<header>
<h2 class="name" id="FileSystem & FileWriter API">FileSystem & FileWriter API </h2>
<h3 class="status avoid">avoid <i>with <b class=polyfill>polyfill</b></i> </h3>
<h4 class="kind api">api</h4>
</header>
<div class="more">
<div class="recco">
<p>Filesystem API provides a method of reading and writing files to a sandboxed file system on the user's local file system.
Supported only by Chrome 18+ with webkit prefix. Check out <a href="http://caniuse.com/filesystem">http://caniuse.com/filesystem</a> for a better understanding of the support.</p>
<p><a href="https://github.com/ebidel/idb.filesystem.js">idb.filesystem.js</a> Implements a polyfill using IndexedDB as its underlying storage layer. Required support for IndexDB means that it works only in Firefox and Chrome.</p>
</div>
<div class="polyfills"><b>Recommended polyfills: </b><p><a href="https://github.com/ebidel/idb.filesystem.js">idb.filesystem.js</a></p></div>
<p class="links">
<a href="http://caniuse.com/filesystem">
View browser share %
</a>
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</p>
</div>
<footer class="tags">prefixes polyfill</footer>
</article>
<article class="prefixes">
<header>
<h2 class="name" id="filters">filters </h2>
<h3 class="status avoid">avoid <i></i> </h3>
<h4 class="kind css">css</h4>
</header>
<div class="more">
<div class="recco">
<p>Filters are now supported by Safari 6 and Chrome 18+. But, given the lack of support in other browsers, consider waiting for other implementations before use. </p>
</div>
<div class="polyfills"></div>
<p class="links">
<a href="http://css3clickchart.com/#filters">
Learn more
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/filters.md">Edit this info</a>
</p>
</div>
<footer class="tags">prefixes</footer>
</article>
<article class="none flexible">
<header>
<h2 class="name" id="flexbox">flexbox </h2>
<h3 class="status avoid">avoid <i></i> </h3>
<h4 class="kind css">css</h4>
</header>
<div class="more">
<div class="recco">
<p>Unfortunately, <a href="http://www.w3.org/TR/2009/WD-css3-flexbox-20090723/">older versions of this spec</a> have been implemented in Gecko, WebKit and Trident. A tutorial covering that spec is <a href="http://www.html5rocks.com/en/tutorials/flexbox/quick/">on HTML5 Rocks</a>.</p>
<p>But <a href="http://dev.w3.org/csswg/css3-flexbox/">the spec</a> has changed significantly. Stephan Hay has <a href="http://www.the-haystack.com/2012/01/04/learn-you-a-flexbox/">written a guide on the new flexbox implementation</a>. However, since this revised spec, the spec underwent more naming changes, which have started to debut in Chrome 22. The spec is now at last call and is considered stable so we expect no more breaking changes.</p>
<p>We recommend you avoid using this until the TR version of the spec finds wide-spread implementation.</p>
</div>
<div class="polyfills"><b>Recommended polyfills: </b><p>http://flexiejs.com/</p></div>
<p class="links">
<a href="http://caniuse.com/flexbox">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/flexbox.md">Edit this info</a>
</p>
</div>
<footer class="tags">none flexible</footer>
</article>
<article class="fallback">
<header>
<h2 class="name" id="@font-face">@font-face </h2>
<h3 class="status use">use <i>with <b class=fallback>fallback</b></i> </h3>
<h4 class="kind css">css</h4>
</header>
<div class="more">
<div class="recco">
<p>Use the <a href="http://www.fontsquirrel.com/fontface/generator">Font Squirrel Generator</a> for fonts you have license for using as web fonts. <a href="http://www.fontspring.com/blog/the-new-bulletproof-font-face-syntax">Fontspring @font-face syntax</a> is also the most bullet-proof way of serving web fonts. You do not need polyfills - just fonts in several formats; WOFF is preferred, followed by TTF and then EOT. </p>
<p>Also, don't use solutions like sIFR or Cufon anymore, as they can cause accessibility and performance problems.</p>
</div>
<div class="polyfills"></div>
<p class="links">
<a href="http://caniuse.com/fontface">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/fontface.md">Edit this info</a>
</p>
</div>
<footer class="tags">fallback</footer>
</article>
<article class="none">
<header>
<h2 class="name" id="font-feature-settings">font-feature-settings </h2>
<h3 class="status use">use <i></i> </h3>
<h4 class="kind css">css</h4>
</header>
<div class="more">
<div class="recco">
<p>Internet Explorer 10, Firefox 4+ and Chrome 16 (Windows and Linux only) support low level control over font feature settings. What this means is other browsers merely will not render the flourishes you seek. Many features available through the property may be extracted to separate properties in the future, such as font-variant-ligatures. </p>
<p>More at <a href="http://www.typotheque.com/articles/opentype_features_in_web_browsers">OpenType features in web browsers</a></p>
</div>
<div class="polyfills"></div>
<p class="links">
<a href="http://blog.fontdeck.com/post/15777165734/opentype-1?503cde40">
Learn more
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/font-feature-settings.md">Edit this info</a>
</p>
</div>
<footer class="tags">none</footer>
</article>
<article class="polyfill gtie9">
<header>
<h2 class="name" id="form validation">form validation </h2>
<h3 class="status use">use <i>with <b class=polyfill>polyfill</b></i> </h3>
<h4 class="kind html">html</h4>
</header>
<div class="more">
<div class="recco">
<p>HTML5 has baked in clientside form validation, and polyfills can enable this for legacy browsers as well. Using the defined HTML5 API for constraint validation may be a more maintainable direction than using a jQuery Validation plugin, depending on your team. When detecting this feature, be aware of Safari's half baked support. It does support form validation, but won't highlight invalid fields or present error messages.</p>
</div>
<div class="polyfills"><b>Recommended polyfills: </b><p><a href="http://afarkas.github.com/webshim/demos/">webshims</a>, <a href="https://github.com/dperini/nwxforms">nwxforms</a>, <a href="https://github.com/ryanseddon/H5F">H5F</a></p></div>
<p class="links">
<a href="http://caniuse.com/form-validation">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/form-validation.md">Edit this info</a>
</p>
</div>
<footer class="tags">polyfill gtie9</footer>
</article>
<article class="fallback">
<header>
<h2 class="name" id="fullscreen">fullscreen </h2>
<h3 class="status caution">caution <i>with <b class=fallback>fallback</b></i> </h3>
<h4 class="kind api">api</h4>
</header>
<div class="more">
<div class="recco">
<p>The Full Screen API is currently only available in the latest versions of Chrome and Firefox. A jQuery plugin is available which contains an optional fallback to a minimal-chrome browser window when the Full Screen API is unavailable. Use as a progressive enhancement for those select browsers only.</p>
</div>
<div class="polyfills"><b>Recommended polyfills: </b><p><a href="https://github.com/darcyclarke/jQuery-Fullscreen-Plugin">jQuery Fullscreen Plugin</a></p></div>
<p class="links">
<a href="http://caniuse.com/fullscreen">
View browser share %
</a>
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</p>
</div>
<footer class="tags">fallback</footer>
</article>
<article class="fallback gtie8">
<header>
<h2 class="name" id="geolocation">geolocation </h2>
<h3 class="status use">use <i>with <b class=fallback>fallback</b></i> </h3>
<h4 class="kind api">api</h4>
</header>
<div class="more">
<div class="recco">
<p><a href="http://code.google.com/p/geo-location-javascript/">geo-location-javascript</a> has hooks into BlackBerry, WebOS, and Google Gears specific APIs. In most cases, you should just not expose Geo features in your app if the feature is not natively present.</p>
</div>
<div class="polyfills"><b>Recommended polyfills: </b><p><a href="http://code.google.com/p/geo-location-javascript/">geo-location-javascript</a></p></div>
<p class="links">
<a href="http://caniuse.com/geolocation">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/geolocation.md">Edit this info</a>
</p>
</div>
<footer class="tags">fallback gtie8</footer>
</article>
<article class="fallback prefixes gtie8">
<header>
<h2 class="name" id="gradients">gradients </h2>
<h3 class="status use">use <i>with <b class=fallback>fallback</b></i> </h3>
<h4 class="kind css">css</h4>
</header>
<div class="more">
<div class="recco">
<p>We strongly recommend you use all the prefixes (<code>-o-</code>, <code>-webkit-</code>, <code>-ms-</code>, <code>-moz-</code>) when you provide gradients as image values (<code>background</code> or <code>border-image</code>). Do provide a fallback color if you are using this as a value for <code>background</code> so browsers that do not support the gradients can render a solid background color. </p>
<p>We also suggest you drop old WebKit syntax and only use the <a href="https://developer.mozilla.org/en/CSS/-moz-linear-gradient">newer syntax</a> for gradient values and <a href="http://www.broken-links.com/2012/01/11/the-new-and-hopefully-final-linear-gradient-syntax/">not the latest one</a> (yet) until <a href="http://www.w3.org/TR/css3-images/">the specification</a> hits Candidate Recommendation. </p>
</div>
<div class="polyfills"></div>
<p class="links">
<a href="http://caniuse.com/gradients">
View browser share %
</a>
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</p>
</div>
<footer class="tags">fallback prefixes gtie8</footer>
</article>
<article class="none">
<header>
<h2 class="name" id="grids">grids </h2>
<h3 class="status avoid">avoid <i></i> </h3>
<h4 class="kind css">css</h4>
</header>
<div class="more">
<div class="recco">
<p>The <a href="http://dev.w3.org/csswg/css3-grid-align/">CSS Grid Layout</a> specification supersedes several older ones, and only features an experimental implementation in Internet Explorer 10. Until the specification matures and more implementations exist, we suggest that you avoid using this.</p>
</div>
<div class="polyfills"></div>
<p class="links">
<a href="http://caniuse.com/grids">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/grids.md">Edit this info</a>
</p>
</div>
<footer class="tags">none</footer>
</article>
<article class="fallback">
<header>
<h2 class="name" id="history">history </h2>
<h3 class="status use">use <i>with <b class=fallback>fallback</b></i> </h3>
<h4 class="kind api">api</h4>
</header>
<div class="more">
<div class="recco">
<p>The <code>History</code> API provides a way for JavaScript to change the URL displayed in the browser without reloading the page. There are several approaches to providing a fallback. The simplest is to fall back to page refreshes. Alternatively, the <a href="https://github.com/balupton/history.js">History.js</a> plugin smooths out some browser implementation differences and provides an optional hashchange fallback for HTML 4 browsers. GitHub uses <a href="http://pjax.heroku.com/">pjax</a> (pushState + ajax).</p>
</div>
<div class="polyfills"></div>
<p class="links">
<a href="http://caniuse.com/history">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/history.md">Edit this info</a>
</p>
</div>
<footer class="tags">fallback</footer>
</article>
<article class="gtie8 polyfill">
<header>
<h2 class="name" id="HTML5 elements">HTML5 elements </h2>
<h3 class="status use">use <i>with <b class=polyfill>polyfill</b></i> </h3>
<h4 class="kind html">html</h4>
</header>
<div class="more">
<div class="recco">
<p>All current browsers, except Internet Explorer 8 and below, support the use of the new HTML5 elements (e.g., <code><header></code>, <code><footer></code>, <code><nav></code>, <code><article></code>, <code><section></code>, etc.). However, they aren't always mapped to accessibility APIs as the <a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/elements.html#wai-aria">HTML5 spec</a> requires. Currently <a href="http://html5accessibility.com/">only Firefox does this</a>, but other browsers are implementing the accessibility APIs quickly. In the meantime, <a href="https://github.com/yatil/accessifyhtml5.js">Accessifyhtml5.js</a> maps them correctly.</p>
<p>The notes below only apply to Internet Explorer 8 and below:</p>
<p>The <a href="http://code.google.com/p/html5shiv/">html5shiv</a> enables you to use the new HTML5 elements in your markup (and Modernizr does the exact same by default).</p>
<p>If you insert any of these new elements later on (via AJAX or templating), the html5shiv will handle this for you (as of v3). <a href="http://blog.jquery.com/2011/11/03/jquery-1-7-released/">jQuery 1.7</a> has this functionality baked in.</p>
<p>Lastly, if you need these elements to print correctly, use <a href="https://github.com/aFarkas/html5shiv/blob/master/src/html5shiv-printshiv.js">html5shiv-printshiv.js</a>.</p>
</div>
<div class="polyfills"><b>Recommended polyfills: </b><p><a href="http://code.google.com/p/html5shiv/">html5shiv</a>, <a href="https://github.com/aFarkas/html5shiv/">html5shiv (github)</a>, <a href="https://github.com/yatil/accessifyhtml5.js">accessifyhtml5.js</a></p></div>
<p class="links">
<a href="http://caniuse.com/html5semantic">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/html5semantic.md">Edit this info</a>
</p>
</div>
<footer class="tags">gtie8 polyfill</footer>
</article>
<article class="none prefixes">
<header>
<h2 class="name" id="hyphens">hyphens </h2>
<h3 class="status use">use <i></i> </h3>
<h4 class="kind css">css</h4>
</header>
<div class="more">
<div class="recco">
<p><a href="http://dev.w3.org/csswg/css3-text/#hyphenation">CSS Text Level 3</a> allows you to tell the browser to break words using hyphens. Read about how to effectively use <code>hyphens:auto</code> and <code>word-break</code> in <a href="http://blog.kenneth.io/blog/2012/03/04/word-wrapping-hypernation-using-css/">Word wrapping/hyphenation using CSS</a>.</p>
<p>As there won't by any noticable effects on browsers which don't support the feature, we recommend that you use it without any polyfills or fallbacks. <a href="http://code.google.com/p/hyphenator/">CSS Hyphenator</a> is a polyfill that works on browsers that support the soft hyphen. <a href="https://github.com/Modernizr/Modernizr/issues/312">Modernizr has good support</a> for hyphentation detection. It'd also be wise to read <a href="http://davidnewton.ca/the-current-state-of-hyphenation-on-the-web">The Current State of Hyphenation on the Web
</a>.</p>
</div>
<div class="polyfills"></div>
<p class="links">
<a href="http://caniuse.com/hyphens">
View browser share %
</a>
<a href="https://github.com/h5bp/html5please/blob/master/posts/hyphens.md">Edit this info</a>
</p>
</div>
<footer class="tags">none prefixes</footer>
</article>
<article class="gtie9">
<header>
<h2 class="name" id="iframe[sandbox]">iframe[sandbox] </h2>
<h3 class="status use">use <i></i> </h3>
<h4 class="kind html">html</h4>
</header>
<div class="more">
<div class="recco">
<p>This attribute enables fine-grained control over the capabilities of a
document housed within an iFrame.</p>
<p>Browser support is not nearly high enough to consider this measure alone
sufficient for sanitizing output. Use this attribute as part of a
defense-in-depth strategy.</p>
<p>Also see <a href="http://weblog.bocoup.com/third-party-javascript-development-future/#iframe-sandbox">more about implementing <code>iframe[sandbox]</code></a> responsibly on Bocoup's blog.</p>
</div>
<div class="polyfills"></div>
<p class="links">