Front-end teszt
HTML
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<div>
    <span>IPAd
        <span>PC</span>
    </span>
</div>
<span>Printer</span>
CSS
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span { color: red; }
div ~ span { color: blue; }
HTML
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<div>
    <span>IPAd
        <span>PC</span>
    </span>
</div>
<span>Printer</span>
CSS
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span { color: red; }
div > span { color: blue; }
HTML
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<ul class="shopping-list" id="awesome">
    <li>
        <span>IPad</span>
    </li>
    <li class="favourite" id="must-buy">
        <span class="highlight">PC</span>
    </li>
</ul>
CSS
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.shopping-list .favourite { color: red; }
#must-buy { color: blue; }
HTML
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<ul class="shopping-list" id="awesome">
    <li>
        <span>IPad</span>
    </li>
    <li class="favourite" id="must-buy">
        <span class="highlight">PC</span>
    </li>
</ul>
CSS
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ul#awesome .favourite { color: red; }
#ul.shopping-list li.favourite span { color: blue; }
HTML
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<div id="test1">
    <span id="test2"></span>
</div>
CSS
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#test2 {
    background-image: url('mypic.jpg');
    display: none;
}
CSS
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@media only screen and (max-width: 1024px) { margin: 0; }
HTML
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<head>
    <link href="main1.css" rel="stylesheet">
    <script>
        alert('Hello World');
    </script>
</head>
JS
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var foo = 1;
function bar() {
    foo = 10;
    return;
    function {}
}
bar();
alert(foo);