I was advised not to use any properties inside <tr> tags because it can create problems in some browsers. Is that really so?

one way to find out..is to create a page and use that <tr> tags..and test your page in different browsers..check for any difference.. :O) maybe experts around here can give you a better explanation
Goodluck!

We find that there are <onEvent> properties that may fail in <tr> between browsers, we put the <onEvent> handlers in the <td> instead,
visual styling seems to work with every thing

per cguan's advice, this link BroswerShots will let you check out your code in browsers (all of them) to which you do not have access.
It provides screen dumps of browser/os combination

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