Media Query
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>style</span><span class="token punctuation">></span></span><span class="token style"><span class="token language-css">
            <span class="token selector">div</span> <span class="token punctuation">{</span>
                <span class="token property">display</span><span class="token punctuation">:</span> none<span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
            <span class="token atrule"><span class="token rule">@media</span> <span class="token punctuation">(</span><span class="token property">max-width</span><span class="token punctuation">:</span> 550px<span class="token punctuation">)</span></span> <span class="token punctuation">{</span>
                <span class="token selector">.shy-div</span> <span class="token punctuation">{</span>
                    <span class="token property">display</span><span class="token punctuation">:</span> block<span class="token punctuation">;</span>
                <span class="token punctuation">}</span>
            <span class="token punctuation">}</span>
            <span class="token atrule"><span class="token rule">@media</span> print</span> <span class="token punctuation">{</span>
                <span class="token selector">.print-div</span> <span class="token punctuation">{</span>
                    <span class="token property">display</span><span class="token punctuation">:</span> block<span class="token punctuation">;</span>
                <span class="token punctuation">}</span>
            <span class="token punctuation">}</span>
        </span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>style</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>shy-div<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>Oh hi there.<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>print-div<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>I heard you like printers?<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">></span></span>