It was necessary for me in my project to know does browser support minWidth or not. So I added this checking to $.support. It would be nice to see this feature in next release of jQuery.

/* jQuery.support.minWidth */
$(function() {
	var 
		table = document.createElement('table'),
		tr = table.appendChild(tr = document.createElement('tr')),
		td = tr.appendChild(td = document.createElement('td'));

	table.cellPadding = 0;
	table.cellSpacing = 0;

	td.innerHTML = '<div style="min-width: 150px;">';

	document.body.appendChild(table);

	$.support.minWidth = table.offsetWidth === 150;

	document.body.removeChild(table).style.display = "none";
	
	table = tr = td = null;
});

Thanks!