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    <p>My personal favourite pseudo-selector is :target . </p> <p>Here is a little pure-CSS lightbox I created that relies solely on :target. The lightbox is called <a href="http://lightbocss.eggmaps.com/" rel="nofollow">LightBoCSS</a> (for obvious reasons). There is a demo on the main page, and a link to the github repository. Note that I haven't put any non-webkit transitions in there yet, so use a webkit browser for the best experience.</p> <h1>The HTML:</h1> <pre><code> &lt;div class="lightbox"&gt; &lt;!-- ===== Put the thumbnails in here ===== --&gt; &lt;div class="thumbnails"&gt; &lt;a href="#b1"&gt; &lt;img src="images/ScreenShot1thumb1.png"/&gt; &lt;/a&gt; &lt;a href="#b2"&gt; &lt;img src="images/ScreenShot2thumb2.png"/&gt; &lt;/a&gt; &lt;/div&gt; &lt;!-- ===== Put the big images in here ===== --&gt; &lt;div class="lightboximg"&gt; &lt;a id="b1" href="#"&gt; &lt;img src="images/ScreenShot1.jpg" alt="EggMaps iPhone Screenshot 1" /&gt; &lt;/a&gt; &lt;a id="b2" href="#"&gt; &lt;img src="images/ScreenShot2.jpg" alt="EggMaps iPhone Screenshot 2" /&gt; &lt;/a&gt; &lt;/div&gt; &lt;/div&gt; </code></pre> <h2>The Basic (distilled) CSS that makes it work:</h2> <p>The "top" property is changed when the "a" is the target.</p> <pre><code>/* Hide each large image */ .lightboximg &gt; a { /* the container for a large image */ top: -999em; } /* display the (large image container) anchor elem when it is the target */ .lightboximg &gt; a:target { top: 0px; } </code></pre> <h2>The Complete CSS:</h2> <pre><code>/* Note the :target pseudo-selector. */ /* Hide each large image */ .lightboximg &gt; a { /* the container for a large image */ display: block; min-height: 100%; width: 100%; position: absolute; /*top: -999em; for browsers that can't set top in percentages - see comment from xception below */ top: -101%; background-color: #222222; /* dark grey - for browsers that can't do rgba */ background-color: rgba(0,0,100,0.4); /* for browsers that can't set multiple backgrounds */ background: url(Fabric-14.png), rgba(0,0,100,0.4); opacity: 0; transition: top 1s ease-in-out, opacity 1s ease-in-out, z-index 0.5s ease-in-out; -webkit-transition: top 1s ease-in-out, opacity 1s ease-in-out, z-index 0.5s ease-in-out; z-index: -1; } /* display the (large image container) anchor elem when it is the target */ .lightboximg &gt; a:target { top: 0px; opacity: 1; transition: top 1s ease-in-out, opacity 1s ease-in-out, z-index 0.5s ease-in-out; -webkit-transition: top 1s ease-in-out, opacity 1s ease-in-out, z-index 0.5s ease-in-out; z-index: 1001; } /* style for the large images */ .lightboximg &gt; a img { /* centre the image */ display:block; margin: 0px auto; /* make it fit into the window */ max-width: 100%; } </code></pre>
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    1. POJavascript onclick simulation using only css and html (without javascript)
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    1. POJavascript onclick simulation using only css and html (without javascript)
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    1. COAlso a very nice solution, you get my vote for this, but with this you can't have more than one target at a time, mine allows you to combine multiple input states to decide on a rule. Yours however has the advantage that it actually uses links to update the page state. Well done, keep up the good work!
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    2. COOne thing, I just looked over your css and you have this: `top: -999em; /* for browsers that can't set top in percentages */`. I'm pretty sure any browser that can't set top in percentages will also not be able to use opacity, transitions or know about the `:target` css selector.
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    3. COThanks @xception . I think you're right. Transitions and opacity are really just extra sugar on here, but of course :target is critical. If a browser *cough* doesn't support :target, we can just drop in selectivizr to add support. I have a vague memory (hitherto repressed) of a browser not respecting percentage positions. A quick google search showed [this](http://www.positioniseverything.net/explorer/percentages.html) , which I can't tell if it applies to this problem. I certainly can't find any other relevant references, so I'll edit out the redundant property.
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