I thought it was intentional and not a bug - thanks for reporting! It's true that I don't see flash-of-unstyled-content on HTML and XHTML pages, unless the CSS

I thought it was intentional and not a bug - thanks for reporting! It's true that I don't see flash-of-unstyled-content on HTML and XHTML pages, unless the CSS file is delayed by many seconds. I noticed another bug though - the Firefox inspector tool doesn't show style rules for the XML document.