They can if the feature is implemented by the SPA framework/library/whatever, and if the JS loads and if there aren't any bugs (e.g. imagine a bug that means a

They can if the feature is implemented by the SPA framework/library/whatever, and if the JS loads and if there aren't any bugs (e.g. imagine a bug that means a fragment with an unexpected character can't be loaded). Conversely, static HTML links (either links to id/name fragments in a large file, or links to specific pages if using separate files) almost can't fail, and it's incredibly unlikely a SPA would be even close to loading if regular static pages fail to load properly.