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<html><head><style> #myDIV { width: 500px; background-color: lightblue; overflow: auto;}</style></head><body><p>Click the "Try it" button to alert the max-height of the DIV element:</p><button onclick="myFunction()">Try it</button><div id="myDIV" style="max-height:100px;"> <p>This DIV element does not have a pre-defined height.</p> <p>The height of this DIV element depends on its content.</p> <p>But the DIV element has a max-height, and will never exceed 100 pixels.</p></div><script>function myFunction() { alert(document.getElementById("myDIV").style.maxHeight);}</script></body></html>