public void AllByTagNameFailsToResolveElementInXHTMLDocumentTest()
{
const string Html = @"<html xmlns=""http://www.w3.org/1999/xhtml"">
<head>
<title>IIS 8.0 Detailed Error - 500.0 - Internal Server Error</title>
</head>
<body>
<div id=""content"">
<div class=""content-container"">
<h3>HTTP Error 500.0 - Internal Server Error</h3>
<h4>The page cannot be displayed because an internal server error has occurred.</h4>
</div>
</div>
</body>
</html>";
var page = new HtmlPageStub(Html);
var elements = page.Find<AnyHtmlElement>().AllByTagName("h3").ToList();
elements.Count.Should().Be(1);
}