public void WaitForStyles()
{
HtmlDiv div = this.Elements.GetHtml("mainDiv").As <HtmlDiv>();
exec(5);
div.Wait.ForStyles("backgroundColor=blue");
ActiveBrowser.Refresh();
div.Refresh();
exec(5);
string s = div.GetComputedStyleValue("backgroundColor");
// Wait until background color is NOT yellow.
div.Wait.ForStylesNot(true, "backgroundColor=yellow");
}