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    As a beginner to javascript, I was wondering if there is a way to specify opacity in javascript like in css. I googled but could not find how to define it as in css. I get an error when I try in js.
    This is what I want to say in css.
    background-color: rgb(0, 0, 0, 0.5);

    I cannot figure out adding opacity with out getting error.
    var colors = [
    [0, 0, 0],

    thank you.


    You’ll need to set the style property of the element.

    With Javacript you’ll need to get a reference to the element whose styles you wish to change. This could be an ID or class.

    For example, given the following HTML:

    <div id="myDiv"></div>

    You could write something like:

    // grab the element we want to apply styles to
    var el = document.getElementById('myDiv');
    // change the background color style property to this rgb value = "rgb(0, 0, 0)";

    You can alter any css property this way!


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