I owe Brian an apology. I misunderstood the issue. I've not seen that problem before, either. Would never have thought to check for it. Learned something new about min-width. Thanks Ralph for the lesson and thanks Brian for posting the issue.
About spaces in URLs... we were both right. Brian's URLs were fine; I was wrong to pounce on 'em. But they were fine because they have quotation marks around them. Those same URLs without surrounding quotes would fail.
Fundamentally, URLs cannot have spaces. Browsers insert a filler, usually %20, sometimes pluses. In my opinion, it's better if the web page author uses underscores, dashes, pluses, %20's, or runs words together, and takes responsibility for paths and file names rather than leaving them to the browser's or server's discretion. Who knows when someone might overlook a pair of quote marks.