div width vs. max-width

HTML

<div style="width: 200px">200px width reference</div><br />
<br />
<div>Case 1: abc def ghi</div><br />
<div>Case 2: abc def ghi jkl mno pqr stu</div><br /> <!-- Problematic case! -->
<div>Case 3: abc def ghi jkl mno<br />pqr stu</div><br />

CSS

div {
    display: inline-block;
    max-width: 200px;
    border: 1px black solid;
}