How to highlight code lines

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One of the main advantage of this forum is that you can highlight easily code lines by using

You do not need to specify the language, the forum will find it for you (HTML, JavaScript…)

If you use 

<div class="row">
        <div class="col-md-3">
        </div>
    </div>

or using 

<div class="row">
        <div class="col-md-3">
        </div>
    </div>