[oneeyedpigeon]

You don't really have to 'worry' about those things, you just follow best practices and - for the most part - they get dealt with automatically. Following the standards always gets you additional benefits that the "javascript required" crowd always gloss over. As a trivial example (there are many more), using a non-existent fragment identifier as a link target and capturing the click event doesn't just break when javascript is unavailable, it also breaks opening that link in a new tab.