Is this available? Has it been certified? What is the current CSS version?
Typically, where is the URL link pointing to?
"This next example might be found in a UA's default style sheet. It implements the CSS3 generic font family, serif by mapping it to a wide variety of serif fonts that might exist on various platforms. No metrics are given since these vary among the possible alternatives."
local("Times New Roman"),
font-weight: 100, 200, 300, 400, 500;
CSS3 module: Web Fonts