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    <p>Look ma, no JavaScript!</p> <h2>HTML</h2> <pre><code>&lt;table&gt; &lt;tr&gt; &lt;td&gt;true&lt;/td&gt; &lt;td class="invalid"&gt;false&lt;/td&gt; &lt;td&gt;true&lt;/td&gt; &lt;td&gt;true&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; </code></pre> <h2>CSS</h2> <pre><code>@-webkit-keyframes invalid { from { background-color: red; } to { background-color: inherit; } } @-moz-keyframes invalid { from { background-color: red; } to { background-color: inherit; } } @-o-keyframes invalid { from { background-color: red; } to { background-color: inherit; } } @keyframes invalid { from { background-color: red; } to { background-color: inherit; } } .invalid { -webkit-animation: invalid 1s infinite; /* Safari 4+ */ -moz-animation: invalid 1s infinite; /* Fx 5+ */ -o-animation: invalid 1s infinite; /* Opera 12+ */ animation: invalid 1s infinite; /* IE 10+ */ } </code></pre> <h2>Live demo</h2> <p><a href="http://jsfiddle.net/bikeshedder/essxz/" rel="noreferrer">http://jsfiddle.net/bikeshedder/essxz/</a></p> <hr> <h1>For those poor souls who are forced to use an outdated browser</h1> <h2>CSS</h2> <pre><code>.invalid-blink { background-color: red; } </code></pre> <h2>JavaScript</h2> <pre><code>$(function() { var on = false; window.setInterval(function() { on = !on; if (on) { $('.invalid').addClass('invalid-blink') } else { $('.invalid-blink').removeClass('invalid-blink') } }, 2000); }); </code></pre> <h2>Live demo</h2> <p><a href="http://jsfiddle.net/bikeshedder/SMwAn/" rel="noreferrer">http://jsfiddle.net/bikeshedder/SMwAn/</a></p>
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