Unfortunately SSIs dont work on s3 and some other plaforms, thereby negating their utility for running static sites on CDNs or keystores. But YES- why isn't there an SSI equivalent in the HTML spec?
> why isn't there an SSI equivalent in the HTML spec?
Because HTML Imports died in the spec drafting process. Unless you want a client-side SSI equivalent that doesn't require any JavaScript, HTML Imports wasn't that. I'm not aware of an alternative proposal that doesn't.
