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set html text color and size using javascript

Suppose I have the following line of code in html, how to set the text color and size inside "MonitorInformation" DIV element in a programming way using Javascript in an easy way? Sorry for my stupid, I figured a long time but cannot figure out. :-(

<div id="MonitorInformation">Connecting...wait</div>

thanks in advance, George

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var elem = document.getElementById("MonitorInformation");
elem.innerHTML = "Setting different HTML content";
elem.style.color = "Red";
elem.style.fontSize = "large";

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