index.html, there is a canvas tag that the game will be drawn in.
Grab that canvas out of the DOM.</p>

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            <div class="content"><div class='highlight'><pre>    <span class="hljs-keyword">var</span> canvas = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">"space-invaders"</span>);</pre></div></div>
            
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