Since they are standard XHTML, you can load up Firefox and open your Kid templates directly. If it's important or useful for you, you can make the templates look great all by themselves when loaded in the browser.
What do you need to watch for? Stylesheets, JavaScript and variable substitutions.
Sometimes, it's inconvenient or impossible to have a stylesheet href that works properly when viewing the template directly and after the template is rendered. To get around this, you can use href to handle viewing the template in your browser and py:attrs to handle the rendered page. For example:
When you're viewing the template in your browser, your browser's only going to look at the href attribute, so your stylesheet will be loaded properly. When the template is rendered for the final view, Kid will substitute the value that's in py:attrs, so that the stylesheet works properly on the web. When dealing with JavaScript, this same approach will work for the src attribute on the script tag.