JavaScript why are initial CSS styles not visible on DOM element .style field?

OK I have full expectation of going down in flames for asking something stupid (or at least duplicate), but in the attached snippet, why do I have to use window.getComputedStyle to access styles applied by CSS? I was under the impression that the .style field would at least reflect those styles initially applied by CSS, and/or manually changed since then.

If not, what are the exact rules governing which properties are reflected (and when) in an element's .style field?

setTimeout(() => {
    console.log("the bckg color:", reddish.style.backgroundColor);
    console.log("the width:", reddish.style.width);
    console.log("from a computed style:", window.getComputedStyle(reddish).backgroundColor);
    console.log("from a computed style:", window.getComputedStyle(reddish).width);
}, 100);
#reddish {
    background-color: #fa5;
    width: 100px;
    height: 100px;
}
<html>
    <body>
        <div id="reddish"></div>
    </body>
</html>
Answer:1

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