So how do you deliver design on the web, if not without code?

Remember that designing for the web is not like designing for print, where the dimensions of your canvas, and the amount and nature of your content, are known quantities. A web page is expected to accommodate every possible device, agent and viewport -- watches, phones, tablets, laptops, desktops, TVs, screen readers, ebook readers, etc. * portrait and landscape orientations * browser window sizes -- and content that can change by the minute and whose size is unknown until all of it has arrived on the device.

Think about all these conditionals and variables, and how much instruction you need to provide, efficiently, for making it all look as good as possible, to the browser/agent. Doesn't all this seem like the necessary purview of a domain-specific programming language?