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larlet-fr-david-cache


			
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<h1>
  <span><a id="jumper" href="#jumpto" title="Un peu perdu ?">?</a></span>
  Graded browser support (archive)
  <time>Pour la pérennité des contenus liés. Non-indexé, retrait sur simple email.</time>
</h1>
<section>
  <article>
    <h3><a href="https://github.com/springernature/frontend-playbook/blob/master/practices/graded-browser-support.md">Source originale du contenu</a></h3>
    <h1>Graded browser support</h1>
<ul>
<li><a href="#our-criteria-for-browser-support">Our criteria for browser support</a></li>
<li><a href="#how-we-implement-graded-browser-support">How we implement graded browser support</a></li>
</ul>
<h2>Our criteria for browser support</h2>
<p>We follow the guidelines for graded browser support outlined by Nate Koechley at Yahoo:
<a href="https://github.com/yui/yui3/wiki/Graded-Browser-Support">Yahoo Grade Browser Support guide</a></p>
<p>Our browser support in summary:</p>
<ul>
<li>Grade-A are browser versions that are explicitly <em>supported</em>. A product bug in one of these browsers is a high priority.</li>
<li>Grade-C are browser versions that are explicitly <em><em>not</em> supported</em>. We serve only the minimum styling and functionality to these browsers.</li>
<li>Grade-X are the grey area between Grade-A and Grade-C. We serve them the same code as Grade-A, but we do not test our products against these browser versions. Over time, analysis of errors and usage patterns may cause some browsers in Grade-X to be deliberately demoted to Grade-C.</li>
</ul>
<p>| Tables                      | Grade-A support                 | Grade-C support    |
| --------------------------- |:-------------------------------:| ------------------:|
| Chrome                      | latest stable, latest stable -1 | &lt; 29               |
| Edge                        | latest stable, latest stable -1 | n/a                |
| Firefox                     | latest stable, latest stable -1 | &lt; 29               |
| IE                          | 11                              | &lt; 11               |
| Opera                       | latest stable                   | &lt; 16               |
| Safari iOS                  | latest stable, latest stable -1 | &lt; 7                |
| Safari MacOS                | latest stable, latest stable -1 | &lt; 6.1              |
| Android browser (Chromium)  | Latest stable                   | &lt; 4.4              |</p>
<h3>Notes</h3>
<ul>
<li>We have no explicit Grade-C support for Edge.</li>
<li>We have no Grade-X support for IE, as we officially only support IE11, with anything below that being Grade-C. However, due to browser technical limitations we can only detect IE10+, so IE10 is, for now, included in our CTM media query.</li>
</ul>
<h2>How we implement graded browser support</h2>
<p>Our primary approach to graded browser support is the "cutting the mustard" progressive enhancement technique, based upon the principles developed by the BBC: <a href="http://responsivenews.co.uk/post/18948466399/cutting-the-mustard">Cutting the Mustard</a>.  However, user agent sniffing is still applied on some legacy projects.</p>
<p>We load a basic stylesheet to all users. This contains only <a href="https://necolas.github.io/normalize.css/">normalisation</a> and a few small enhancements to the user-agent stylesheet.
To load the full experience only in modern browsers (grade-A and grade-X) we implement logic in the media attribute of the <code>&lt;link&gt;</code> element that identifies the main stylesheet, loading the stylesheet only in browsers that recognise the properties of that media query.
This technique is documented here: <a href="https://www.sitepoint.com/cutting-the-mustard-with-css-media-queries/">Cutting the Mustard with Media queries</a>.</p>
<p>The media queries we use are based upon <a href="https://github.com/Fall-Back/CSS-Mustard-Cut">CSS Only Mustard Cut</a>, with a preference towards combining them into one rather than separating them out into multiple <code>&lt;link&gt;</code> elements.  Note that you <strong>cannot</strong> add line breaks to the media query if they are combined.</p>
<p>Note: As mentioned above, while our graded browser support table specifies Internet Explorer 10 and below as Grade-C, until an updated media query is found this approach will render IE10 as Grade-A.</p>
<p><code>html
&lt;link rel="stylesheet" href="your-css.css" media="only screen and (-webkit-min-device-pixel-ratio:0) and (min-color-index:0), (-ms-high-contrast: none), only all and (min--moz-device-pixel-ratio:0) and (min-resolution: 3e1dpcm)"&gt;</code></p>
<p>We couple the loading of JavaScript to the loading of the enhanced CSS.
If the browser loads the CSS within the media query, then load the JavaScript.</p>
<p>In order to check this, we use <a href="https://developer.mozilla.org/en/docs/Web/API/Window/matchMedia">window.matchMedia</a>.</p>
<p><code>javascript
(function() {
    var linkEl = document.querySelector('link');
    if (window.matchMedia &amp;&amp; window.matchMedia(linkEl.media).matches) {
        var script = document.createElement('script');
        script.src = 'your-script.js';
        script.async = true;
        document.body.appendChild(script);
    }
})();</code></p>
<p>The javascript code outlined above will fail in Internet Explorer if there is more than one link element. You can get around this by targeting the specific link element using a class or ID.</p>
  </article>
</section>


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    <a href="/david/blog/">Accueil du blog</a> |
    <a href="https://github.com/springernature/frontend-playbook/blob/master/practices/graded-browser-support.md">Source originale</a> |
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      Si tu as apprécié cette lecture, n’hésite pas à poursuivre ton exploration. Par exemple via les <a href="/david/blog/" title="Expériences bienveillantes">réflexions bimestrielles</a>, la <a href="/david/stream/2019/" title="Pensées (dés)articulées">veille hebdomadaire</a> ou en t’abonnant au <a href="/david/log/" title="S’abonner aux publications via RSS">flux RSS</a> (<a href="/david/blog/2019/flux-rss/" title="Tiens c’est quoi un flux RSS ?">so 2005</a>).
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      Voici quelques articles choisis :
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      <a href="/david/blog/2016/enseigner-web/" title="Accéder à l’article complet">Enseigner le Web</a>,
      <a href="/david/blog/2016/simplicite-defaut/" title="Accéder à l’article complet">Simplicité par défaut</a>,
      <a href="/david/blog/2016/minimalisme-esthetique/" title="Accéder à l’article complet">Minimalisme et esthétique</a>,
      <a href="/david/blog/2014/un-web-omni-present/" title="Accéder à l’article complet">Un web omni-présent</a>,
      <a href="/david/blog/2014/manifeste-developpeur/" title="Accéder à l’article complet">Manifeste de développeur</a>,
      <a href="/david/blog/2013/confort-convivialite/" title="Accéder à l’article complet">Confort et convivialité</a>,
      <a href="/david/blog/2013/testament-numerique/" title="Accéder à l’article complet">Testament numérique</a>,
      et <a href="/david/blog/" title="Accéder aux archives">bien d’autres…</a>
    </p>
    <p>
      On peut <a href="mailto:david%40larlet.fr" title="Envoyer un courriel">échanger par courriel</a>. Si éventuellement tu souhaites que l’on travaille ensemble, tu devrais commencer par consulter le <a href="http://larlet.com">profil dédié à mon activité professionnelle</a> et/ou contacter directement <a href="http://scopyleft.fr/">scopyleft</a>, la <abbr title="Société coopérative et participative">SCOP</abbr> dont je fais partie depuis six ans. Je recommande au préalable de lire <a href="/david/blog/2018/cout-site/" title="Attention ce qui va suivre peut vous choquer">combien coûte un site</a> et pourquoi je suis plutôt favorable à une <a href="/david/pro/devis/" title="Discutons-en !">non-demande de devis</a>.
    </p>
    <p>
      Je ne traque pas ta navigation mais mon
      <abbr title="Alwaysdata, 62 rue Tiquetonne 75002 Paris, +33.184162340">hébergeur</abbr>
      conserve des logs d’accès.
    </p>
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