Love the CMS. Just reading through the help docs and found some minor standards mistakes...
_target attribute is also not allowed in HTML 4.01 (Strict).
As much as I prefer HTML 4.01 over XHTML, sadly XHTML has become the de-facto standard, thus safer.
Also does anyone know if HTML5 is supported?
At SilverStripe also use UpperCamelCase for IDs and lowerCamelClass for class names to distinguish between the two easily.http://doc.silverstripe.org/doku.php?id=css#ids_and_classes
I don't expect to see this changed. But note W3C say "Element and attribute names must be in lower case". This is because XHTML is case sensitive unlike HTML.